Remote Technologies Universal Remote RPC 320 User Guide

RPC-320 USER'S MANUAL

REV 2

NOTICE TO USER

may be reproduc ed with Remote Proce ssing cited as the

source.

The information contained in this manual is believed

correct. However, Remote Pr ocessing assumes no

responsibility for any of the circuits described herein,

conveys no license under any patent or other right, and

make no repre sentations that the circuits are free from

patent infringement. Rem ote Processing makes no

representation or warr anty that such applications will be

suitable for the use specified without further testing or

modification. The user must make the final

The con tents of this manual and the specifications her ein

may change without notice.

TRADEMARKS

RPBASIC-52™ is a trademark of Remote P rocessing

Corpor ation.

determination as to fitness for a particular use.

Remote Pr ocessing Corporation' s general policy does not

recommend the use of its products in life support

applications where the failure or malfunction of a

component m ay directly threaten life or injury. It is a

Condition of Sale that the user of Remote Processing

products in life support applications assum es all the risk

of such use and indemn ifies Remote Pr ocessing against

all damages.

PC SmartLINK® is a trademark of Octagon Systems

Corpor ation.

BASIC-52© is a trademark of Intel Corpor ation.

Remote Processing Corporation

79 75 E. Harvard Ave.

Denver, Co 802 31 USA

Tel: (303) 690 - 1588

Fax: (303) 690 - 1875

w w w .rp3.com

P/N 1366

Revision: 2.8

Page i RPC -320

TABLE OF CONTENTS

SECT ION 11

WATCHDOG TIMER

DESCRIPTION . . . . . . . . . . . . . . . . . . . 11-1

EXTERNAL RESET . . . . . . . . . . . . . . . . 11-1

DESCRIPTION . . . . . . . . . . . . . . . . . . . 11-1

OPTICALLY ISOLATED INTERRUPT . . . 11-1

INTERRUPT CHARACTERISTICS . . . . . . 11-1

SECT ION 12

EXTERNAL INTERRUPT

DESCRIPTION . . . . . . . . . . . . . . . . . . . 12-1

PROGRAMMING . . . . . . . . . . . . . . . . . 12-1

Program exam ples . . . . . . . . . . . . . . 12-1

COMMANDS . . . . . . . . . . . . . . . . . . . . 12-2

SECT ION 13

MULTI-MODE COUNTER

DESCRIPTION . . . . . . . . . . . . . . . . . . . 13-1

SECT ION 14

POWER REDUCTION

FURTHER POWER REDUCTION . . . . . . 14-1

Prog ram Exam ple . . . . . . . . . . . . . . . 14-2

SECT ION 15

TECHNICAL INFORMATION

ELECTRICAL SPECIFICATIONS . . . . . . 15-1

MEMORY AND I/O BANK MAP . . . . . . . 15-2

MECHANICAL SPECIFICATIONS . . . . . 15-2

JUMPER DESCRIPTIONS . . . . . . . . . . . 15-2

Page iii RPC-320

SOFTWARE REVISION HISTORY

V1.04

V1.05

Release for RPC 320

BSAVE retur ned a hardware er ror when ver ify

was bad. In fact, save was OK.

V1.06

V1.07

V1.08

LCD graphics hardware CS and reset are

reversed. C ompensated in software.

MTO P was useless in any system, especially a

32K RAM.

Varia bles E and F would get dropped if

followed by a space.

Added de lays betwee n data strob e writes to

LCD display.

V1.09

V1.10

STR(7, . . .) did not put in a CR into the put

string, causing longer strings to be printed.

Initial release for RPC-330.

Added AOT command (330 only)

Added COUNT, ON COM , ON COUNT, ON

LINE, and ON KEYPAD

V1.11

11/29/95

Added day of week to DAT E comm and and

function.

V1.12

V1.13

12/01/95

Added code to use Atmel 29C040A flash.

01/12/96

Added code to support IEE centry series

display (3602-100-05420)

Includes PRINT #port

V1.14

V1.15

V1.16

03/28/96

Fixed bug in ON C OUN T. Returns error for

lines > 100.

06/26/96

PEEK$ could cause BASIC to lock up under

right conditions.

02/18/97

ON LIN E OF F could cause program to lock up

if running ON COM.

Syntax error when DISPLAY used with IF-

THEN-ELSE.

Added PE EKF a nd POKE F com mands.

Page iv RPC -320

OVERVIEW

SECTION 1

from your PC are downloaded using a serial

communication program.

DESCRIPTION

The RP C-320 is an embed ded contr oller with a built in

Basic language. Several featur es make it suitable as a

stand alone unit:

MANUAL ORGANIZATION

This manual pro vides all the infor mation r equired to

install, c onfigure , and operate the RPC-320. Using this

manual you will be able to:

Built in RPBASIC-52 programm ing language

supports hardware using single commands. On card

flash EPROM programm er can save up to 8

progr ams to 62K , or about 500K tota l.

Interface the RPC-320 to your IBM compatible PC

or terminal.

High speed multimode counter accepts quadrature or

single inputs. Program mable for up/dow n, binary,

divide-by-N, X1, X2 or X4 quadr ature counting.

Understand the operation of the RPC-320 hardware

using RPBASIC-52 programming software.

This manual assumes you are fam iliar with some type of

BASIC progr amming software. The syntax used by

RPBASIC-52 is similar to BASIC-52. If you are not

experie nced with a ny BASIC softwar e, you may w ant to

refer to books and training program s available through

your local book store. The BASIC-52 Programm ing

Manual has information and examples for the original

commands. Comm ands unique or modified by

RPBA SIC-52 a re in the Sof tware Supplement in this

manual.

LCD character and gr aphic display and keypad p orts

for operator interface.

Two R S-232 ser ial ports, one of whic h is

configurable for RS-422/485.

Watchdog timer resets card if a program "crashes".

34 digital I/O lines, 9 of which are high curre nt

outputs. 24 of these lines can connect to an opto

rack or o ther TT L devices.

Each chapter or section is written to first provide an

overview. Then, m ore specific information is provided.

Each chapter has some examples using Basic. A

summar y of related hardware com mands is at the end of

most chapters.

Eight channel, 12 bit resolution analog to digital

converter. Configurable operational amplifiers

allow you to signal condition inputs or measure

temperature.

32K, 128K, or 512K RAM battery backable to save

process variables and other data when power is off.

MANUAL CONVENTIONS

Information appearing on your screen is shown in a

different type.

32K or 512K flash EPRO M to save program s and

data.

Example:

The RPC -320 uses an 80C320 CPU operating at 22.1184

Mhz. It can operate stand alone or on a network using

the RS-485 port. Its 4. 7" x 7. 0" size with 4 mounting

holes makes it easy to mount in a NEMA box.

Compactness is enhanced by on-board analog and digital

terminal strips.

RPBASIC-52 V1.0

Bytes free: 27434

RPBA SIC-52 p rogr amm ing language is standard. T his

language is a version of the original Intel BASIC-52. It

was m odified for the RPC -320 for c ontrol, data

acquisition applications, and on board har dware fea tures.

Program development can take place on your PC, using

your word processor, or on the RPC-320. Programs

Page 1-1 RPC -320

OVERVIEW

SECTION 1

TECHNICAL SUPPORT

Symbols and Term inology

If you have a question about the RPC-320 or RPBASIC-

52 and can' t find it in this manual, call us and ask for

technical supp ort. Technical support hours ar e 9 AM to

4 PM mountain time.

NOTE: Text under this heading is helpful information.

It is intended to act as a reminder of some

operation or interaction with another device that

may not be obvious.

When you call, please have your R PC-320 and BASIC-

52 PROGRAMMING MANUAL ready. Many times it is

helpful to know what the R PC-320 is used for, so please

be ready to describe its application as well as the

problem.

WARNING:

Information under this heading warns you of

situations which might cause catastrophic or

irreversible damage.

Phone: 303-690-1588

FAX: 303-690-1875

W[-]

Denotes jump er block pins.

< xxx> Paired angle brackets are used to indicate a

specific key on your ke yboard. F or exam ple

< esc> means the escape key.

The RPC -320 uses a Dallas Semiconductor DS80C320

processor. Additional information can be obtained from

Dallas Semiconductor (214-450-0448, F AX 214-450

0470), or your distributor.

BASIC uses the decimal convention for designating

addresses and data. There are times when hexadecimal

notation is mo re convenient to use. Notation use d in this

manual and BASIC-52 is the ' H' character after the

number. 8CH stands for 8 C hexadecimal.

Page 1-2 RPC -320

OVERVIEW

SECTION 1

Figure 1-1 System layout

Page 1-3 RPC -320

SETUP AND OPERATION

SECTION 2

can easily arc through cables and to the card.

Simply touching your PC before you touch the

card can greatly reduce the amount of static.

INTRODUCTION

The RPC -320 is ready to program as soon as you

connect it to a ter minal or PC a nd apply pow er. This

chapter describes what is needed to get a sign- on

message and begin program ming.

2. Do not insert or remove components when

power is applied. While the ca rd is a + 5 volt

only system, other voltages generated on the

card which affect other com ponents.

Requirements for uploading and downloading programs

are discu ssed. A "W here to go from here" section tells

you what chapters to refer to in order to use the various

capabilities of the RPC-320. Finally, a troubleshooting

section helps out on the most com mon pro blems.

EQUIPMENT

You will need the following equipment to begin using the

RPC-320:

OPERATING PRECAUTIONS

RPC-320 embedded controller

PC w ith a serial port and com munications

program

or a

Terminal

The RPC -320 is designed to handle a wide variety of

temperature ranges at low power. These characteristics

requir e using CM OS com ponents. CM OS is static

sensitive. T o avoid damaging these c omponents,

observe the following precautions before handling the

RPC-320.

VTC -9F ser ial cable

+ 5, 200 ma po wer supply

Refer to Chapter 4, SERIAL PORTS, for w iring

information to make your own serial cable.

1. Ground yourself before handling the RPC -320

or plugging in cables. Static electricity

Figure 2-1 Connector location and function

Page 2-1 RPC-320

SETUP AND OPERATION

SECTION 2

Turn on your pow er supply. On pow er up a

FIRST TIME OPERATION

Become familiar with the locations of connectors before

getting started. See Figure 2-1.

RPBASIC-52 V1.09

RPC-320

RPC -320 jump ers have been set at the fa ctory to operate

the system immediately. F or first time operation, do not

install any connectors or parts unless specified below.

Jumpers sho uld be kept in default positions.

Bytes free: 63740

65,536 bytes of additional expanded memory detected

512K byte EPROM installed

1. Connect power.

If a nonsense message appears, your terminal or PC

may not be set to the appropriate communication

parameters. If the system still does not respond,

refer to TROUBLESHOOTING later in this chapter.

The RPC-320 needs + 5 ±0.25 volts at 100 ma.

Any well regulated supply that supp lies this will

work. Be careful when using "switching" power

supplies. Some of the se supplies do no t regulate

properly unless they are adequately loaded. Don' t

forget that power requir ements inc rease w hen opto

modules a re used. G4 opto m odules require up to

20 ma each.

The sign on message may differ based on the RAM

and flash EPROM installed.

4. Testing.

The system is now in the " imme diate mode" and is

ready for you to start program ming. T ype the

following program:

Make sure pow er is off. Connec t the power supply

to one of the appropriately marked terminals on the

RPC-320. There two power connectors: P2 and P 6.

Either one may be used to connect power.

10 FOR X=0 TO 2

20 PRINT "Hello ",

30 NEXT

2. Hook up to a PC or terminal.

40 PRINT

You can use either a PC o r CR T term inal to

program the RPC-320. Connect one end of the

VTC -9F connector to the 10 pin COM 0 port on the

RPC-320. Refer to Figure 2-1 for connector

location.

Now type RUN. The system will display:

Hello Hello Hello

READY

Terminate a program by typing a < Ctrl> -C.

Using a PC

Connect the VTC-9F serial cable to the PC's COM1

or COM 2 port. Y ou may need a 9 pin male to 25

pin female adapter . T he VT C-9F is designed to

plug directly into the 9 pin serial port connector on a

PC.

UPLOADING AND DOWNLOADING

PROGRAMS

Downloading program s means transferring them fr om

your PC (or terminal) to the RPC-320. Uploading

means transferring them from the RPC -320 back to the

PC. This section explains how to do both of these

procedures using generalized instructions for terminal

programs (Procomm , Windows Ter minal, etc.)

Start up your serial communication program. Set

comm unication par ameter s to 9600 baud, 8 da ta

bits, no parity, 1 stop.

Using a Terminal

When uploading or downloading files, select ASCII text

format. XMODEM, YMODEM, or other formats are

not used.

Follow your term inal instructions to set the baud

rate to 9600 baud, 8 data bits, no parity, and 1 stop.

You may need a 9 pin male to 25 pin male adapter

to connect the VTC-9F.

RPBASIC-52 does not know w hen you are typing in a

progr am or if something else (laptop or mainfr ame) is

3. Power up.

Page 2-2 RPC-320

SETUP AND OPERATION

SECTION 2

increased download time.

sending it char acters. The uploa d and dow nload file

does not contain any special codes; they are sim ply

ASCII cha racters.

Notice that you can w rite a progr am in lower case

characters. RPBASIC-52 translates them to upper case.

Uploading programs is simply a process of receiving an

ASCII file. Y ou or your progr am simply need to send

"LIST " to receive the entire program . The default baud

rate (960 0) is rather high. The RP C-320' s baud ra te is

changed using the CONF IG BAUD command.

Some program mers put "N EW" as the first line in the

file. During debugging, it is common to insert

"temporary" lines. This ensures that these lines are

gone. Down loading time is increase d when the old

progr am is still pre sent. If you like to wr ite progr ams in

separate modules, you can dow nload them separately.

Modules are assigned blocks of line numbers. Star t up

code might be from 1 to 999. Interrupt handling

(keypad, serial ports) might be from lines 1000 to 1499.

Display output might be from 1500 to 2500. The

programmer must determine the number of lines

required for each section.

Downloading a program requires transmitting an ASCII

file. As you type in (or download) a line, RP BASIC-52

tokenizes, or com piles, that line. The time to do this

depends upon its complexity and how many lines of code

have been entered.

RPBASIC-52 m ust finish compiling a line before starting

the next one. When a line is compiled, a "> " character

is sent. This should be your terminal progra ms pacing

character for dow nloading.

RPBASIC-52 autom atically formats a line for minimum

code space. F or example, you could download the

following line of code:

If your communications program cannot look for a

pacing prompt, set it to delay transmission after each line

is sent. A 100 ms delay is usually adequate, but your

program may be long and complex and require more

time. A r esult of a short transmission time is missing or

incomplete pro gram lines.

10 fora= 0to5

When you listed this line, it would appear as:

10 FOR A=0 TO 5

Spaces are displayed but not stored. The following line:

Editing programs and program ming hints

10 for a

Files uploaded or downloaded are simply ASCII DOS

text files. No special characters or control codes are

used. You m ay create and edit programs using your

favorite word processor or editor. Just be sure to save

files in DO S text form at.

would be compressed and displayed as in the second

example above. Spaces are removed. H owever, spaces

as part of a remark or PRINT are not removed.

Instead of uploading and downloading programs, you can

save them to the on card EPRO M. This is useful if you

are using a terminal to write program s. Simply type

SAVE. To retrieve a program, type LOAD.

A technique used to further program documentation and

reduce code space is the use of comments in a

downloaded file. For example, you could have the

following in a file written on your editor:

REM Check position

REM Read output from the pot and

REM calculate the position

2200 a = ain(0) :REM Get position

The first 3 comments downloaded to the RPC -320

are ignored. Similarly, the empty lines between

comm ents are a lso ignored . L ine 2200, with its

comment, is a part of the program and could be listed.

The m ajor pena lty by writing a progr am this w ay is

Page 2-3 RPC-320

SETUP AND OPERATION

SECTION 2

attached, you should see a burst of activity. With a

volt meter, you should see a change in voltage.

Using a Fluke 8060A set to measure A C, you

should see a mom entary rea ding above 2 volts.

WHERE TO GO FROM HERE

If you want to do this:

Turn to

Chapter

3. Install the serial cable and make sure the voltages

and output activity are still there. Output is from

pin 3 on the VTC-9F. If not, check to make sure

something is not shorting the output.

Save a program

Run a program at power up or

reset (autorun)

Know m ore about serial por ts

Install a differ ent RAM mem ory chip

Using RAM to save variables

Run an assembly language program

Configure digital I/O lines

Detect on/off switch status

Use high c urre nt outputs

Connect an external opto rack

Calendar/ clock option

Connect Displays

4. Check the serial pa ram eters on your P C or termin al.

They should be set to:

9600 baud, no parity, 8 data bits, 1 stop

5. If you are receiving a sign on me ssage but not ab le

to enter characters, check U8, pin 4 for at least -6

volts. When it is near 0 volts, the terminal or PC's

Tx line is not connected. When you pr ess a

character on the terminal or P C, you should see the

voltage go positive. Check the serial cable.

Use a keypad

Measure voltages

Using inter rupts

Multi-mode counter

Transmitted signals from the PC or terminal are

from pin 5 on the 10 pin IDC connector.

Use low power operation

If all of this fails, call technical support listed in chapter

Refer to the table of contents for a more detailed listing.

TROUBLESHOOTING

You would probably turn to this section because you

could not get the sign on message. If you are getting a

sign on message but can' t enter characters, then read

section 5 below . T he following are troubleshooting hints

when you can' t get anything.

1. Check the power source. If it is below 4.65 volts at

the input pow er ter minal, the RPC -320 will r eset.

Power is 5 ±0.25 volts. Make sure it is a clean 5

volt source . If it dips intermittently to 4. 65 volts

(due to switching noise or ripple), the card will reset

for about 100 ms. If the noise is frequent enough,

the card will be in per manent reset. Check U7, pin

8. If it is high (about 5 volts), then the car d is in

reset. T his line should be low (about 0 volts).

2. Check the COM 0 port (J3). Rem ove the connector

from COM 0. R efer to the outline drawing ear lier in

this chapter. Connect an oscilloscope (preferred) or

a voltmeter to pin 3 (T xd) and gr ound. Pin 3 should

be -6 volts or more negative. (Pin 1 is designated

by the v symbol on the connector. Pin 3 is next to

it, nearer the key opening.) If you have -6 volts or

more, press the reset switch. If you have a scope

Page 2-4 RPC-320

SAVING PROGRAMS

SECTION 3

A flash EPROM is non-volatile (retaining data even

INTRODUCTION

when power is disconnected), having an unlimited

number of re ad cycles and a limited number of write

cycles (about 1,000). A program is not run fr om

EPROM . It is transferred to RAM and run from there.

Prog ram s in RAM can be m odified. They ar e saved to

EPROM for execution later.

Program s are stored in an EPRO M in socket U6. You

can store one or mor e program s, depending upon

EPROM size. A BASIC program can call another when

a 512K byte EPROM is used.

Maximum program size that can be run at any one time

is about 62K, not including space for variables. 32K

bytes is the maximum program size when a 29C256 IC

type is used to save a program.

The RPC -320 can autorun on power up or r eset by

removing jumper (W9). W hen autorun is on, the

program in EPROM segment 0 is loaded into RAM and

begins to execute immediately.

A conservative rule to determine program memory

requirements is one line requires 40 bytes. 32K bytes

would stor e 800 lines of code. Your application cou ld

be significantly more or less, depending upon the

number of comm ands/line, com ments, and pr int

statements.

Despite the fact you may have a 128K or 512K RAM

installed, the maximum progr am size RPBASIC-52 can

run at one time is about 60K (including room for some

variable storage). T he table below shows the maximum

capacity, maximum number of program lines, program

size at one time, and number of program s for an

EPROM type.

Figure 3-1 W3 autorun jumper

EPROM

type

Max

Cap.

Prog

lines

Max

Bytes Progs

No.

This chapter discusses saving programs to EPR OM (U 6)

and program autoexecution.

29C256

29C040

30K

509K 12400

400

32K

62K

SAVING A PROGRAM

For this example, assume you wanted to save the

following program:

One program can call another using the EXECUTE n

command. n is from 0 to 7, depending upon the

EPROM type.

20 FOR N= 0 TO 2

30 PRINT "Hello ",

40 NEXT

NOTE: When a program calls another, the old program

is completely replaced. All variables and

arrays are clear ed (set to 0).

50 PRINT

If this progr am is not alr eady in, type it in now (or , if

you prefer, use your own progr am).

To keep variables, you m ust save them before calling the

new progr am. When the new program is running, these

variables are restored. Use PEEK and P OKE to read

and save numbers and strings. See Chapter 5, STORING

VARIABLES IN RAM for more inform ation.

Type in the following command:

SAVE

Binary data is saved and read from the EPR OM using

BSAVE a nd BLOA D com mands. The EP ROM has a

limited number of write cycles (about 1000), so wr iting

information should be kept to a minimum.

RPBASIC-52 r esponds with:

Saving 35 bytes

Verifying --- OK

Page 3-1 RPC -320

SAVING PROGRAMS

SECTION 3

The time it takes save a program depends upon the

length and complexity of the program and flash EPROM

type. Pr ogramm ing rate is roughly 600 bytes/second. If

the program is not successfully saved to EPROM, an

error message will appear.

AUTORUNNING

To autorun a program:

1. Make sure there is a program in EP ROM (from

above). When using a 128K or 512K size EPROM,

make sure the star t up progr am was saved to

segment 0.

Saving a pr ogram overw rites the pr evious one. Ther e is

no way to recover the old one since both occupy the

same space.

2. Remove jumper W9.

Using SAVE without any parameters is the same as

typing SAVE 0.

Push the reset button. The program will run. If there

are any error s, the progr am will stop (assuming you

have not trapped them with ON E RROR) and display the

error m essage. EX ECU TE n is used within any

program to load and run another program. The EPROM

size must be a 128K or 512K.

When a 128K (29C 010) or 512K (29C 040) EP ROM is

installed in U6, the SAVE segment parameter is 0 or 1

(128K) or 0 - 7 (512K). EX ECU TE loads and runs the

program in the segment specified by SAVE. A 32K

(29C256) EPROM can run just one program.

PREVENTING AUTORUN

Make the following modifications to the above program

as instructed to see how one program can call another.

There m ust be a 128K or 512K EPRO M installed to run

this code.

When troubleshooting a program , it' s not always

convenient fo r an autoe xecute file to r un. This is

especially tr ue if the pro gram has been configured to

ignore the < ESC> or < Ctl-C> keys.

Add the following lines:

To prevent autorun, install jumper W9 before power up

or re set.

10 PRINT "Program segment 0"

60 EXECUTE 1

LOADING A PROGRAM

Now type:

SAVE 0

Ther e are tim es when you may w ish to tempor arily

modify or otherwise test out a change to a program.

Since the program is loaded into RAM in autorun,

modifications are m ade withou t affecting the pr ogram in

EPROM. Use the LOAD or LOAD n comm and to

transfer the EPROM program to RAM.

Now m odify lines 10 and 60 as follows:

10 PRINT "Pr ogram segme nt 1"

60 EXECUTE 0

Now type:

If you find out that modification s are not de sirable or did

not work, you can restore the original program to RAM

using the LOAD com mand.

SAVE 1

To see the programs operate, type RUN. To stop program

execution, press < Ctrl-C> .

CHANGING EPROM SIZE

The RP C-320 can com e with a 32K or 512 K flash

EPROM . The size may be changed at any time. Set

W3 according to the type/size.

You may notice there is a slight pause between the

printed he llo' s and program segment number . T his is

the time it takes to clear memory and load the program.

Loading and clear ing take appr oximately 0.25 seconds in

a very small program up to 1 second in a very large

program.

Type

Size

Bytes

Configuration

29C256 32K

[3-5], [4-6]

29C010 128K

[3-5], [2-4]

Page 3-2 RPC -320

SAVING PROGRAMS

SECTION 3

29C040 512K

[1-3], [2-4]

COMMANDS

To change the EPRO M in U6, remove the IC and

replace it with the new one. Whe n installing a 29C256,

pin 1 on the IC goes into socket pin 3. The top two

rows of pins are empty.

The following is a list of RPBASIC-52 commands used

for saving, loading, and executing programs and data.

These comm ands and functions are explained in the

Software Supplement in this manua l.

ALTERNATE EPROMS

Comm and

BLOAD

Function

Flash EPR OMs ar e more expensive than UV er asable or

OTPs as of this writing. Large volume OEM' s may

wish to use lower cost EPRO Ms.

Transfers binary data from

EPROM to RAM

Transfers binary data from RAM

to flash EPROM

BSAVE

Program development must use flash EPROM s. Whe n a

program is finished, the flash EP ROM is used as a

master. Use an exter nal progra m to duplicate progr ams.

EXECUTE

Loads, clear s memory, then runs

a program from w ithin a program

Loads a program from EPROM

Saves a program to flash EPROM

LOAD n

SAVE n

Jumper W2 is normally configured for flash EPROM

(W2[3-5 ] and W2 [4-6]). For non-flash E PRO Ms, W2 is

configured for [1-3] and [2-4]. Large volume OEM's

should contact Remote Processing regarding pre-

configuring W2 and W3 for your application.

Page 3-3 RPC -320

SERIAL PORTS

SECTION 4

COM0 SERIAL PORT

DESCRIPTION

This port uses a VTC-9F serial cable to connect external

serial devices to the por t. T he cable con sists of a 10 pin

IDC connector wired one-to-one to a DB-9 connector.

Line 10 is sim ply cut off. The pin out is designed so it

plugs directly into the 9 pin serial port connector on a

PC.

The RPC -320 has two serial ports that interface to a

printer, terminal, RS-485 network, or other serial

devices. This chapter describes their char acteristics and

how to use them. Fre quent ref erence s are m ade to

commands listed in the BASIC-52 Programm ing Manual

or RPBASIC-52 Software Supplement in this manua l.

Please refer to these manuals for m ore information about

these comm ands.

CTS is a output and is set to high on power up.

Norm ally, this tells the other device to send data. The

CTS line is set high or low to hold off communication.

The sending device must have a RTS input. L ine 400

sets CTS high and 500 sets it low, or to hold off.

Serial por ts are num bered C OM 0 and CO M1. COM 0 is

RS232 only and is used for progr am deve lopment.

During r un time, it can be used for other functions.

COM 1 is a general purpose port and is jumperable for

RS-232 or RS-422/485.

400 LINEB 5,0,(LINEB(5,0) .AND. 247)

500 LINEB 5,0,(LINEB(5,0) .OR. 8)

Each port has a 256 character interr upt driven input and

output buffer. This allows sending characters without

slowing down program execution. How ever, if the

PRIN T buffer fills, pr ogram execution is susp ended until

all PRINT char acters are in the buffer. Both ports have

a 256 character input buffer. When mor e than 256

characters are r eceived, excess ones are ignored.

COM 0 is normally used for program ming. D uring run

time it ma y be used as a genera l purpose serial por t.

When used for programming or with the INPUT

statement, it will accept ASCII character values from 0

to 127. When used with the GET function, it will return

ASCII values from 0 to 255.

COM1 SERIAL PORT

CON FIG BAU D controls baud rate and RS-232/485

mode (CO M1 only).

COM 1 is either an RS-232 or RS-422/ 485 port.

VTC -9F serial cable, descr ibed above, is used for RS-

232 level communications. RS-485 is from screw

terminals. COM 1 has 2 hardw are handshaking lines,

CTS and RT S.

RTS is an input to the car d. W hen RT S to the card is

low, it usually indicates the sender does not want any

data sent to it. The status of this port is read by the

LINEB statement. The example below retur ns a status

of the RTS line:

100 B = LINEB(5,1) .AND. 32

Figure 4-1 Serial port and jumper locations

If B = 32, the sender is not requesting information and

nothing further should be printed.

ON C OM $ is useful whe n data is sent in pac kets. This

multitasking command branches to a BASIC subroutine

when a specific char acter or number of chara cters is

received.

The CT S line may be set high or low to hold off

comm unication from a se nding device. The sender must

recognize the CTS line. Line 400 sets CTS high and 500

sets it low, or to hold off.

Another useful function is STR. Strings can be

formatted, analyzed for length and content. When used

in conjunction with ON COM $, networ king over RS-485

is much easier than with the original BASIC-52.

Page 4-1 RPC -320

SERIAL PORTS

SECTION 4

Figure 4-2 Network diagram

RS-422/485 OPERATING INFORMATION

400 LINEB 5,0,(LINEB(5,0) .AND. 251)

500 LINEB 5,0,(LINEB(5,0) .OR. 4)

RS-422/485 Termination network

Jumper W 4 determines if COM 1 receive is RS-232 or

RS-422/485.

When the RPC-320 is the last physical unit on a network

(RS-485), or it is the only unit (RS-422), the receiver

must be terminated to prevent ringing. Jumper block

W5, 6 installs or removes this network. Insert a jumper

in W5 and W6 to install the network terminator.

W4[1-2]

W4[2-3]

RS-485

RS-232 (de fault)

COM1 default is RS-232. Use the CONFIG BAUD

statement to set the software to RS-422 or RS-485.

When set to RS-422, the transm itter is always on. RS-

485 mode turns on the transmitter only when sending.

Only one slave device on a RS-485 network should have

a terminator installed. The host transmitter shou ld also

have a 100 ohm resistor in series with a 0.1 m fd

capacitor . T he term inator on the RPC -320 includes p ull

up and pull down resistors to prevent lines from floating

and generating er roneous char acters.

Page 4-2 RPC -320

SERIAL PORTS

SECTION 4

Two wire RS-485

The RS-485 port on the RPC-320 is set up for 4 wire

mode. 2- wire mode causes transmitted data to be

received. T o use the RPC-320 is this mode, your code

should "flush" the received data or otherwise r emove

transmitted information.

Mechanically, to make a 2- wire system, simply connect

T+ to R+ and T- to R -. M ake sure CON FIG BAUD is

set up for RS-485 mode.

Multidrop Network

Figure 4-3 Data packet

You can use the RPC-320 in a m ultidrop network by

using CO M1' s RS-422/ 485 port. You can c onnect up to

32 units (including other RPC -320' s) over a 4,000 foot

range.

The response depends upon the nature of the command.

Suppose the command M means "return a digital I/O

port status". T he RPC-320 could rea d the port and

respond with AA2< cr> . The first A is an

acknowledge, that is no error s were detected in the

message. The data, A 2, is a hex number and is broken

down as follows:

Figure 4-2 shows an exam ple of a multidrop network.

This networ k includes a host and one or m ore devices.

The host transmits data packets to all of the devices, or

nodes, in the network. A data packet includes an

address, com mand, data, and a checksum. See figure 4-

3. The packe t is received by all devices, and ignored by

all except the one addressed.

Bit/line

Status

7 6 5 4 3 2 1 0

1 0 1 0 0 0 1 0 = A2

Lines 1, 5 and 7 are high while the others are low.

The relationship described below between nodes and the

host is a maste r-slave. The host dir ects all

The following program fragment uses ON C OM$ and

STR in a network environment. ON C OM$ generates an

interrupt when a < CR> is received. The interr upt

progr am uses a STR fun ction to deter mine if the da ta

packet was addressed to this card.

communication. Nodes "do not speak unless spoken to".

Peer to peer com munication, while possible with the

RPC-320, is not discussed here.

Ther e are m any com munication protoco ls. F or this

example, a protocol might look som ething like this:

10 STRING 200,20

20 ON COM$ 1,0,13,1000

30 $(1) = ">05"

> 22M B1

The pr otocol starts w ith the < cr> charac ter. This

character synchronizes all units and alerts them that the

next few characters coming down are address and data.

In this case, "> 22" is the units address. "M " is the

comm and and " B1" is the checksum . T he comm and is

terminated with a < cr> character.

1000 $(0) = COM$(1)

1010 A = STR(8,$(0),$(1))

1020 IF A = 0 THEN RETURN

Line 20 sets up ON CO M$ to interrupt on a < CR> and

branch to line 1000. Line 30 sets up this card' s address.

Line 1010 checks to see if the received message = this

card's address. If not, the subroutine ends. When there

is a match, further processing is performed.

ACCESSING SERIAL BUFFERS

Page 4-3 RPC -320

SERIAL PORTS

SECTION 4

You can access C OM0 and COM 1 buffers in three w ays:

DISABLING CONTROL-C

Program execution is terminated by entering a

< Cntl> < C> . To disable < Cntl> < C> so program

execution is not terminated, execute the following

statement:

1. INPUT sta tement. This removes all characters in

the buffer up to the term inator cha racter and puts

them into a variable.

When using the INPUT statement, program

execution is susp ended until a < cr> (Enter key) is

received. W hether this is a problem depends on

your particular application.

DBY(38) = DBY(38) .OR. 1

COMMANDS

The following is a list of RPBASIC-52 commands used

for serial I/O. These commands and functions are

explained in the BASIC-52 Programm ing Manual and

RPBASIC-52 Software Supplement in this manua l.

INPUT strips bit 7. This means ASCII characters

from 0 to 127 are rec eived.

2. GET function. Char acters ar e rem oved one at a

time as an ASCII value. A 0 is returned when the

buffer is empty. Use the C OM function to

determine if the buffer is empty or if a 0 is an

ASCII value. Use UIn to select the serial port for

GET.

Comm and

Function

CLEAR COM$

COM$

COM

Clears serial input buffer

Returns string from buffer

Returns number of characters

in buffer

If you don' t read the buffer and the buffer fills, all

subsequent characters are discarded.

CONFIG BAUD

GET

Sets serial port parameters

Returns a character fr om the

serial buffer

3. COM$(n) retrieves all characters in the buffer,

including other control codes (except CR).

INPUT

LIST

Receives string from port

Outputs program listing

Outputs data in various

form ats

ACCESSING COM0 AND COM1

PRINT #,

SPC

STR

Prints to a specified port

Print out n number of spaces

String handling commands

Tabs to predetermined

positions

Reroute inputs to COM0

Route inputs to COM1

Rerou te PRIN T statem ent to

COM0

INPU T and GET functions retrieve data using the UIn

comm and. UI0 routes inputs to C OM 0 while U I1 inputs

from the CO M1 port. PRINT outputs are set by the

UOn command. UO0 prints out COM0 while UO1

outputs COM1 using the PRIN T comm and. PR INT #1,

is an alternative way to print to COM 1.

TAB

UI0

UI1

UO0

The following show how UIn and U On work.

UO1

Route P RINT statement to

COM1

100 UI0

Set to COM0

110 INPUT A

Get data from COM0 port

USING

PRINT formatting statement

520 UI1

530 INPUT B

Switch to COM1 port

Get data from COM1 port

SERIAL PORT PIN OUT

Pin outs for J1 and J2 are shown below. Unused pins

are open.

800 REM

810 PRINT "Temperature:",T

Print to COM0

900 REM Print to COM 1

910 PRINT#1, "Set pressure at:",CA

J1 &

Name

Direction

from card

Power up default is set to COM 0.

RTS*

Out

Page 4-4 RPC -320

SERIAL PORTS

SECTION 4

RXD

CTS

Out

Ground

+ 5

*RTS input not in COM0.

A seria l cable is made by simp ly taking a 10 pin fe male

IDC connector and crim ping a 9 wir e ribbon c able to it.

Page 4-5 RPC -320

RAM MEMORY

SECTION 5

To install a new memory chip:

INTRODUCTION

1. Turn off power to the RPC-320.

32K, 128K, or 512K of RAM may be battery backed on

the RPC-320. RA M size can be changed at any time.

RAM is in socket U5.

2. Remove the mem ory chip from U 5.

3. Orient the chip so pin 1 is towards the inside.

If installing a 32K RAM , place the chip at the

RAM is backed up when a DS1216DM is installed.

Battery life depends upon RAM size, its power

consumption, ambient temperature, and amount of time

the board is operating. Gener ally, a battery life of about

3 to 5 years is expected . Oper ating the boar d at 50 °C

reduces battery life by 1/2.

bottom

of the socket (m emor y chip pin 1 goes into

socket pin 3). The top two socket pins in each row

are empty.

If installing a 128K or 512K, install the chip into the

socket.

The DS1216DM is also a real time clock. Thus, DATE

and TIM E functions and com mands are available when it

is installed. See Chapter 7 for more inform ation.

4. Check and change , as n ecessar y, jum per W 1 to

conform to the new mem ory.

This chapter discusses changing RAM, saving and

retrieving variables, r unning assembly language

program s, and battery condition. F igure 5-1 shows the

location of U3 and jumper W1.

RAM size

Jumper W1

32K

128K

512K

[1-2]

[2-3]

Increasing RAM size does not necessarily increase the

program size RPBASIC-52 can handle. Maximum

program and variable size is 60K. Additional RAM does

increase the amount of space available for PEEK and

POKE storage.

BATTERY BACKUP

An optional battery backup module may be installed.

Principal is the same as installing a RAM chip.

WARNING:

An additional modification must be performed to the

DS1216DM module when a 512K RAM is installed.

Contact Rem ote Processing fo r details.

To install a module:

1. Remove the RAM IC in U5.

2. Install the DS1216DM in U5.

3. Re-install the RAM chip into the top of the module.

Figure 5-1 RAM and W1 jumper location

CHANGING MEMORY

Checking the battery

Battery voltage is approximately 3.0 volts, measured

between pin 16 (ground) and 30 (128K RAM ), 14 and 28

(32K RA M), or 16 and 32 (512K RAM ) on the IC itself

(not the circuit side of the board). Be sure to pow er up

the RPC -320 once to a ctivate the batter y backup cir cuit

in the module.

Different types of memory can be installed at any time.

RPC-320 models come with either 32K or 128K of RAM

installed. Maximum is 512K.

To change a mem ory chip, you need to rem ove the

original chip, install the new one, and set jumper W 1.

Page 5-1 RPC -320

RAM MEMORY

SECTION 5

RESERVED MEMORY

Many control systems use process variables that are

operator entered. "variables" in this context include

numbers, strings, ar rays, recipes, or formulas as applied

to your application. They are not a part of the variables

used by Basic. Process variables are accessed by PEEK

and POK E type statements.

The upper 512 by tes of mem ory ar e set aside for this

purpose in a 32K RAM system. In 128K and 512K

RAM systems, all of the first 64K of RAM is used for

program and variable stora ge. P rocess var iables in these

larger versions are stored starting at segment 1 and

higher.

Figure 5-2 RPBASIC-52 memory map

100 POKEB0,7E00H,C

120 B = PEEKB(0,7E05H)

When the combined program and data size exceed 30K,

a 128K or 512K RA M is necessary. Additional R AM is

necessary when your pr ogram has large ar rays and / or

string storage r equireme nts.

The highest address in a 32K RAM system is 7FFFH.

MTOP should not be used when variables are battery

backed for power off conditions. Basic clears all of

RAM in segment 0 (except for the last 512 bytes in a

32K system) at power up. Store process variables

starting at segment 1 or higher in a 128K or 512K RAM

system or start at address 7E00H, segment 0 in a 32K

RAM system.

Many times it is desirable to store an array containing a

"mixed" set of variables. Suppose you needed to save an

array m ade up of the following elem ents:

Bytes Type

Description

Byte

Job counter

Word

Floating

String

Analog output offset

Corr ection factor

Job name

STORING VARIABLES IN RAM

Program s and RPBASIC-52 var iables reside in segment

0. D ata is generally stored in segment 1 and higher (a

segment is 64K of memory). See memor y map figure 5-

2. "Data Area" is segment 1 or higher.

Total number of byes required for each array is 30 (add

1 for a < CR> at the end of the string).

The Job c ounter is increm ented ever y time it is

completed. A nalog output offset is an output constant or

other var iable used to initialize the outputs. Job name is

used with the display to identify a job.

PEEK and PO KE commands store and retrieve values

from memor y. For example:

20 POKEB1,12,A

For this example, suppose there are 20 of these arrays

that need to be set up. A program fragment is as

follows:

puts the 8 bit value of A into segment 1, addr ess 12.

Use the PEEK statement to retrieve the variable:

100 STRING 400,20 Initialize 20 string arrays

50 B = PEEKB(1,12)

300 NO = 12

Element to fill

Corr ection factor

Job counter

310 CF = 23.432

320 JC = JC + 1

330 AC = 25

Accessing reser ved mem ory in a 32K RAM system is

accomplished as follow s:

Analog offset

350 GOSUB 1000

500 NO = 5

Element to retrieve

Page 5-2 RPC -320

RAM MEMORY

SECTION 5

510 GOSUB 2000

Retrieve variables

This subroutine stores variables CF, JC, and AC into an

array starting in segment 1, address 0.

ASSEMBLY LANGUAGE INTERFACE

1000 POK EB1, 30*NO, JC

1010 POKEW1,30*NO+ 1,AC

1020 POKEF1,30*NO+ 3,CF

1030 POKE$1, 30*NO+ 9,$(0)

1040 RETURN

Assembly language program s must be placed in the

RPBASIC-52 E PROM . W hen using RPBASIC-52,

progr ams should start at addr ess 6000H or higher up to

7FFFH.

RPBASIC is norm ally in a 32K byte EPROM (27C256).

A 64K byte EPROM (27C512) may be used in socket U4

provided the following modification is made: Cut the

trace between W11 pins 1 and 2 on the circuit side.

(Jumper W11 is under socket U4. P in 1 is designated by

the square pad.) Solder a jumpe r between W11 pin 2

and 3.

Subroutine 2000 - 2040 retrieves data into variables CF,

JC and AC.

2000 JC = PEEKB(1,30*NO)

2010 AC = PEEKW (1,30*N O+ 1)

2020 $(1) = PEEK$(1, 30*NO+ 9)

2030 CF = PEEKF (1,30*N O+ 3)

2040 RETURN

Docum ented assem bly language interface calls listed in

the Intel MCS BASIC -52 Users Manual will not work

with RPBASIC-52. This is because RPBASIC-52 has

been reassembled and code shifted around.

You can store and retrieve strings and variab les in this

way. Ther e are many variations of PEEK and POKE

statements. Refer to the RPBASIC-52 Software

Supplement in this manual for additional information and

examples. A list of comm ands appea rs at the end of this

chapter.

The RP-10 adapter boar d is used to run and debug

assembly and C code. This board plugs into RAM

socket U5 and RPBASIC socket U4. It does not use the

Basic at all.

BLOCK DATA TRANSFER

COMMANDS

Blocks of data are transferred to and from RA M and

flash EPR OM u sing BLOAD and BSAVE comma nds.

Block transfers are useful for loading and storing data,

look-up tables, text, etc. U p to 65,535 bytes can be

moved from RAM to EPROM or EPROM to RAM at

one time. The absolute number of bytes that are moved

is limited by the RAM and EPR OM sizes.

The following is a list of RPBASIC-52 commands used

with RAM.

Comm and Function

BLOAD

BSAVE

CALL

CBY

DBY

Transfers data from EPROM to RAM

Transfers data from RAM to EPROM

Calls an assembly language routine

Return s code memor y data

Returns or assigns internal memory

Sets top of RAM memory

Return s a byte

Returns a floating point number

Returns a 16 bit value

Returns a string

Stores a by te

Stores a floating point number

Stores a 16 bit value

Stores a string

Returns or assigns external memory

Transfers from EPRO M to RAM , using BLOA D, take

approximately 23.5 m s/1000 bytes. T ransfers from

RAM to EPROM , using BSAVE , are even longer at 100

ms/ 1000 bytes using a 512K byte EPR OM . T his time is

even longer when smaller E PROM s are used (due to the

program ming algorithm).

MTOP

PEEK B

PEEK F

PEEK W

PEEK $

POKE B

POKE F

POKE W

POKE $

XBY

Serial port, tick timer, and external interrupts are

enabled dur ing these transfers. Howe ver, response s to

ONT ICK or ONIT R are d elayed by the time it takes to

transfer data. W hen ONTIC K or ONIT R must be

serviced faster, transfer data in sm aller blocks.

Refer to BLOAD and BSAVE in Appendix A for more

information.

Page 5-3 RPC -320

DIGITAL AND OPTO PORTS

SECTION 6

technical support for suggestions appropriate to your

application. Power may be applied to ISOA/B at

any time.

INTRODUCTION

Digital I/ O lines ar e used to inter face with op to-module

racks, switches, low current LED's, and other TTL

devices. The RPC-320 has 34 of these lines. 8 TTL I/O

lines go to a terminal strip. Additionally, there is one

high curr ent output and a n opto-isolated inp ut. R efer to

the figure below for the location of these lines.

Several softwar e comm ands support the digital I/O ports.

ON L INE br anches to a subroutine w hen a line changes.

ON C OUN T counts the number of high to low

transitions at a digital line. Maxim um coun ting rate is

about 95 Hz. T hese commands simplify design and

greatly speed up execution. See Appendix A for more

information.

Eight lines at P6 are intended for general purpose TTL

I/O such as switches, level sensors or to drive other

devices.

DIGITAL I/O PORTS

A 24 line con nector, J3, is inte nded to inter face to opto

racks or other TT L devices. 8 of these lines are high

curr ent outputs, capable of sink ing 75 to 200 m a. O pto

modules on an opto rack sense presence of AC or DC

voltages or switch them.

All ports use an 82C55 for I/O. Lines are accessed

using LINE or LINEB commands. Lines at J3 and P6

are configured for inputs or outputs using the CONF IG

LINE comm and. See Appendix A for information.

L8 at P2 is a "zero" ohm FE T switch. It is intended for

switching L ED b ack lighting on an LC D display. This

line may also be used to switch high current, high

voltage power . It can sw itch up to 2 amps.

WARNING:

When using CON FIG LIN E, output lines go low

momentarily (less than 10 micro-seconds) until they

are set high again as per the data in the command

line. Some other lines are affected when C ONF IG

LINE 0 is executed. Refer to CONFIG LINE

command in Appendix A for more inform ation.

ISOA/B is used as an isolated input as well as an

interrupt.

In addition to the 24 I/O lines from J3, the display port

can be used as digital I/O. Refer to Chapter 8 for more

information.

Digital Por t J3

This port is used to interface opto modules (using the

MP S series racks), drive small r elays, solenoids,

motors, or lamps, and provide general purpose TTL I/O

to other logic devices or mechanical switches. The

LINE com mand is use d to access and control this p ort.

The lines on J3 are divided into 3 eight bit groups from

an 82C55. Ports A and B are configured as all inputs or

outputs. Port C is progr amm ed as one gr oup of 8 inputs

or outputs or as two groups of four lines (upper and

lower C). T he four lines in upper and lower C can each

be program med as all inputs or outputs. R efer to T able

6-1 to determine the opto channel or J3 pin number for a

port. U se CON FIG LIN E 100 (Appendix A) to

configure por ts A, B, and C for inputs or outputs.

Figure 6-1 Digital I/O

When a line is configured as an output, it can sink a

maximum of 2. 5 ma at 0.4V and can source over 2. 5

ma. Outputs sink 15 ma at 1. 0V. This will dr ive opto

modules. P ort B is connected to a high current sink

through U12. See "High current output" later.

WARNING:

Apply power to the RPC -320 before applying a

voltage to the digital I/O lines to prevent current

from flowing in and damaging devices. If you

cannot apply power to the RPC-320 first, contact

Digital I/ O lines at J3 m ay be pulled up to + 5 volts or to

Page 6-1 RPC -320

DIGITAL AND OPTO PORTS

SECTION 6

to the touch. Consider the maxim um ambient

ground through a 10K/100K resistor packs using jumper

W7. 10K is on digital port A only.

temper ature the b oard w ill operate at. A t 70°C, warm to

the touch at room temperature m ay be too much.

Consider adding a heat sink.

Jumper W7 for pull up or down configuration is as

follows:

The PW M com mand m ay be used with this port. Use

the circuit in Figur e 6-2 when switching induc tive loads.

Use the "GN D" ter minal next to L8 when switching

loads.

W7[1-2]

W7[2-3]

Pull up

Pull down

Setting W7 for pull up makes interfacing to switches and

"open collector" TTL devices easy . See "Inter facing to

Switches and other devices" below.

Optically Isolated Input

ISOA a nd ISOB ar e inputs to an optica l isolator. This

input is read as L8. It can also generate an interrupt

provided W8[1-2] is jumpered and ONITR is set. Refer

to Chapter 12 for input voltage and interrupt

requirements. This line can be used to "wake up" the

CPU fr om low power IDLE 2 mode.

Digital Port P6

Connector P6 has 8 digital I/O lines for general pur pose

use. Additionally, 3 ground and a + 5V positions are

provided. + 5V power and gr ound may be brought in or

taken from this connector. L ines are numbered L 0-L7.

This por t may be used to interfa ce switches, dr ive small

LED' s, and provide general purpose TTL I/O to other

logic devices. Voltage and current param eters are the

same as J3 except there is no high current output. Port

C from an 82C55 is used for this I/O.

The status is read using the LINE(8) function.

A = LINE(8)

A 1 is returned when there is no input and a 0 when

voltage is sufficiently high enough to turn on the isolator

(about 3.5 volts).

Upon po wer u p or reset lines L0 to L3 ar e inputs while

L4 to L7 are outputs. Lines L4 and L5 are low while L6

and L7 are high at power up. All lines are connected to

a 10K pull up resistor (R21). Lines are r econfigured for

all inputs or outputs using the CONFIG LINE 0

command, found in Appendix A.

The opto isolator is not polarity sensitive. This input can

be used in conjunction with or independently of the

ONIT R statement.

Digital I/O Commands

High Current Port L8

L8 will switch 2 amperes to ground through a "zero

ohm" FET switch. Maxim um off voltage is + 50 volts

DC. "ON" resistance is about 0.5 ohm.

The CON FIG LINE statement is used to configure lines

at J3 and P6 for inputs a nd outputs. J3 power up default

is all inputs. P6 pow er up default is L0 to L 3 are inpu ts

and L4 to L7 are outputs. CONFIG LINE 0 refers to P6

while CON FIG LIN E 100 to J3.

Use this port to switch LED back lighting for LCD

displays on or off under softwar e control.

The L INE comm and has 3 variations: LIN E, LIN E B,

and LINE #. Each is described below. See Appendix A

for more inform ation.

This line is always an output. Use the LINE 8 com mand

to turn this line off or on.

LINE 8,ON

LINE function and statem ent is used with M PS-XX opto

rack at J3. It accesses a module according to the

position number printed on the MPS board. Lines are

numbered from 100 to 123. The opto module number

used in this command is computed by adding 100 to the

board position number. LINE also accesses L0-L 8 on

P2 and P6.

LINE 8,1

Both commands turn on L8.

The F ET sw itch is rated fo r much higher curr ent.

However, continuous current is much less without a heat

sink attached. You may dr aw more than the rated 2

amps on an intermittent basis. How m uch and for how

long depend s upon your application. A quick w ay to

check for excessive current is to touch (VERY

The LIN E B function and statement is used to acc ess

CARE FUL LY!) Q2 (next to P2). It can be warm to hot

Page 6-2 RPC -320

DIGITAL AND OPTO PORTS

SECTION 6

ON C OUN T and O N LIN E do not ne cessarily h ave to

be input lines. They can be outputs controlled by

another part of the program.

digital I/O lines 8 bits at a time. T he address for port A

is 0, B is 1, and C is 2. J3 I/O bank number is 3.

Address for lines L0-L7 at P6 is 2 and I/O bank number

is 5.

High Current Output

LINE # function and statement accesses lines according

to the pin number at J3. J3 lines are number ed from 101

to 125. The line number used in this com mand is

computed by adding 100 to the connector pin number.

Line 102 is not allowed as it is the + 5V supply. See

table 6-1 to cor respond a pin numb er to a por t and opto

rack position.

Eight lines at J3 can be used as high cur rent driver s.

These outputs will switch loads to ground. Outputs are

controlled by Port B on the 82C55.

Logic outputs are inverted. That is, when a 1 is written

to the high current port, the output is switched on and

goes low.

P6 lines are numbered 0 to 7, and correspond to the

terminal number on the boar d. The L INE function and

comm and are used to acc ess these lines. L 8 at P2 is a

high current output and is accessed using LINE 8. T he

status of ISOA/B is returned using LINE 8 function.

The output driver chip, U 12, can be replaced w ith a DIP

shunt jumper so it is like the other lines at J3. To do

this, r emove U12. Install a DIP shunt so pin 1 goe s to

pin 18. Pins 9 & 10 ar e open.

LINE, LINE B and LIN E # re turn a ' true' logic level.

A ' 1' indicates + 5 volts or high and a '0' is low or

ground. LINE B and LINE # output true logic levels.

LINE, however, outputs inverted logic. In order to turn

on an opto m odule, a line must go low. Howe ver, to

turn on a module using LINE, specify ' 1' or ON. High

curr ent output chip U 12 inverts c ontrol signa ls sent to it,

regardless of comm and.

NOTE: Outputs at the high current lines are not

compatible with TTL logic levels and should not

be used to drive other logic devices.

Each of the high current outputs can sink 500 ma at 50V.

However, package dissipation will be ex ceeded if all

outputs are used at the maximum rating. The following

conserv ative guidelines a ssume the number of outputs

are on simultaneously:

100 LINE 118,1

110 LINE 118,ON

120 LINE#104,0

:REM Turn opto 118 ON

:REM Turns opto 118 ON

:REM also turns 118 ON

# of outputs

Maximum current

per output

ON LIN E is a multitasking command. W hen active, the

RPBASIC oper ating system checks the specified line

every 5 ms. If the line changed state from the previous

scan, a software interr upt is set. Upon completion of the

current BASIC command (and assuming no other

interrupts are active), pr ogram execution branches to a

specified subroutine. This command is useful for

monitoring lines, such as limit or door switches, that

may not change often or when the program structure

make it unwieldy to check lines frequently.

500 ma

400 ma

275 ma

200 ma

160 ma

135 ma

120 ma

100 ma

Another multitasking command, ON C OUN T, causes the

operating system to ch eck the specified line every 5 m s.

Up to 8 lines are monitored. If the line changed from a

high-to-low state, a counter is incremented. M aximum

counting rate is effectively 95 Hz. This command has

two variations. One causes a software interr upt when a

specified num ber of co unts is reached. Another simply

counts pulses at a line. The C OUN T function returns

the number of pulses since ON CO UNT was initiated.

See Appendix A for command infor mation.

The ther mal time constant of the package is very shor t,

so the number of outputs that are on at any one time

should include those that overlap even for a few

milliseconds.

Incandescent lamps have a " cold" curre nt of 11 times its

operating current. Lamps requiring more than 50 ma

should not be used unless a series resistor is installed.

Page 6-3 RPC -320

DIGITAL AND OPTO PORTS

SECTION 6

130

A = LINE#(103)

Function

Protection diodes m ust be used with inductive loads.

Refer to figure 6-2

Program line 100 turns external opto module rack

position 0 off. Program line 110 sets J3, pin 3, to a

logical 0 level. Program line 120 returns the status of

externa l opto modu le rack po sition 0. If the modu le is

"off", a 1 is returned (assuming it is an output module).

Program line 130 returns the status of J3, pin 3 as a 0 or

Example: To turn on opto module in slot position 8, the

following command is executed:

Figure 6-2 Inductive load protection

LINE 108, 1

Do not parallel outputs for higher drive. This could

result in damage since outputs will not share current

equally.

A ' 1' turns on a module while a 0 turns it off. (In actual

fact, a 0 is written at the port. )

The outputs at U12 are open collector. An external

device must supply power.

See Digital I/ O program ming exam ple later in this

chapter.

Interfacing Digital I/O to an opto-module rack

Interfacing to switches and other devices

I/O lines at J3 can interface to an MPS-8, 16, or 24

position opto m odule rac k. L ines not going to an opto

module connect to a screw terminal on the MPS-XX

series boards. This feature allows you to connect

switches or other TTL type devices to the digital I/O

lines. The MPS-XX series boards accept G4 series

modules.

Switches and other digital I/O devices may be connected

directly to P6 or J3. The STB-26 terminal board

provides a convenient way of interfacing switches or

other digital I/ O devices. L ines at J3 are connected to

the STB-26 with a CMA-26 cable. Digital devices are

then connected to the screw terminals on the STB-26.

The M PS-XX serie s opto racks also provide a way to

access digital I/O lines.

A CM A-26-24 connects J3 on the RPC-320 to the MP S-

XX board. Cable length should be less than 2 feet.

Excessive cable lengths cause a voltage drop and

consequently unreliable operation. Make sure + 5 V and

ground is connected to the M PS-XX racks.

Switches may be connected directly to a line. When

jumper W7 configures the resistors as pull ups, a switch

closure to ground at a line is read as a 0 using the LINE

# function at J1. 10K resistors are always pulled up at

lines L0 to L7.

Before a line is set, the 82C55 chip must be initialized.

This is done using the CONFIG LINE statement. Group

inputs and outpu ts together. Refer to Table 6-1 for opto

module position, port number , and connector pin out. If

opto channels 16-23 are used, U12 should be replaced by

a DIP shunt jumper.

When W 7 configures the input re sistors as pull downs,

one end of the switch m ust be tied to + 5 volts. If this is

not possible or convenient, a 1K resistor can be tied

between an input and + 5 volts to force it high when a

switch is open.

Digital I/ O prog ramm ing exam ple

The LINE and LINE # com mands are used to control

and access opto modules and lines. These commands are

both functions and statements, depending upon how they

are used.

The follow ing exam ple reads a switch at port A, bit 3

(J3-25) (program line 200), r eads L1 at P6 (program line

210) and turns on opto module at channel 5 (program

line 220). A LE D is controlled through the high current

port at J3-10 (port B, bit 0) (program lines 230 and 240).

For testing, a 100 ohm resistor from J3-10 to + 5 volts

can be substituted.

100 LINE 100, 0

Statement

Function

110 LINE #103, 0

120 A = LINE(100)

Page 6-4 RPC -320

DIGITAL AND OPTO PORTS

SECTION 6

100 CON FIG LIN E 100,13, 1,1, 1

200 D = LINE #(125)

210 F = LINE (1)

220 LINE 105, 1

230 LINE #110,1 :REM Turn on LED

240 LINE #110,0 :REM Turn off LED

Line 100 configured the 82C55 so ports A and C are

inputs while B is the output.

Note that the LINE statement is used to control both opto

modules and individual lines.

Lines can also be read or controlled in the imme diate

mode.

PRINT LINE#(125)

returns the status at J3-25. Notice that even when a line

is configured as an output, its status can be read back.

Execute the following to control L7.

LINE 7,OFF

sets L7 low. E xecuting

LINE 7,ON

sets the line high.

LINEB is used to read and write a byte at a time.

LINEB 3,1,128

sets port B, bit 7 high and bits 0-6 are low.

Pulse Width Modulation (PWM)

Any line accessible by the L INE com mand m ay be pulse

width modulated. PW M comm and parameters determ ine

high and low time (to 5 ms resolution) and, optionally,

number of pulses.

Use PW M to control the brightness of a display (via line

8), control the speed of a motor, or output a number of

pulses to a stepper controller. Brightness control using

LED ' s is best achieved when htime or ltime are less than

5 (25 ms). O ne of the parameters should be 1.

Noticeable flicker occurs when htime and ltime sum to

more than 6 (30 ms).

See the PWM comm and in the Software Supplement for

more inform ation. Use Table 6-1 to use an output

directly from J3.

Page 6-5 RPC -320

DIGITAL AND OPTO PORTS

SECTION 6

Table 6-1 Connector pin ou t - J3

Pin #

82C55

Description

Opto

Channel

Port A, line 0

Port A, line 1

Port A, line 2

Port A, line 3

Port A, line 4

Port A, line 5

Port A, line 6

Port A, line 7

Port B, line 0

Port B, line 1

Port B, line 2

Port B, line 3

Port B, line 4

Port B, line 5

Port B, line 6

Port B, line 7

High current

Port C, line 0 Lower C

Port C, line 1 Lower C

Port C, line 2 Lower C

Port C, line 3 Lower C

Port C, line 4 Upper C

Port C, line 5 Upper C

Port C, line 6 Upper C

Port C, line 7 Upper C

Ground

+ 5V

Figure 6-3 Digital I/O connector pin out (viewed from top)

Page 6-6 RPC -320

DIGITAL AND OPTO PORTS

SECTION 6

COMMANDS

The following tables shows the RPBASIC-52 comm ands

used for digital I/O.

Comm and

Function

CONFIG LINE Configures I/ O ports

COUNT

LINE

Returns number of pulses at a line.

Function returns status of an opto

module as a 0 or 1.

LINE

Statemen t turns on or off an opto

module.

LINE B

LINE #

ON COUNT

ON LINE

PWM

Function returns 8 data bits from any

I/O type device.

Statement writes 8 data bits to any I/O

type device.

Function re turns status of line at J3

connector as a 0 or 1.

Statement wr ites data to a line at J3

connector as a 0 or 1.

Counts pulses and optional generates an

interrupt.

Generates an interrupt when a line

changes.

Sets PWM param eters for any line.

Page 6-7 RPC -320

CALENDAR/CLOCK

SECTION 7

NOTE: The clock module is turned off as shipped from

the factory. DATE and TIME functions return

a HARDW ARE erro r until DA TE is set first.

DESCRIPTION

An optional DS1216DM calendar/clock module m ay be

installed in U5. The DS1216D M also battery backs

RAM.

To retrieve date and time as part of a program:

100 PRINT "Time: ",

110 FOR N=0 TO 2

120 PRINT TIME(N),

130 NEXT

140 PRINT "Date: ",

150 FOR N=0 TO 2

160 PRINT DATE(N),

170 NEXT

The DS1216DM from Remote Processing is a modified

version of the Dallas DS1216D. An internal reset line

has been cut. When a 512K RAM is installed, an

additional line is cut and another soldered. Contact

Remote P rocessing for de tails.

180 PRINT CR,

190 GOTO 100

Battery life depends greatly upon the ambient

temperature. Battery life degrades up to 50% at 50°C,

using 25°C as a refer ence. RAM size and type also

affect battery life. Generally, you can expect a battery

life of 3 to 5 years.

run

Time: 13 24 12 Date: 94 11 14

When the clock module is missing, defective, or the date

has not been set, a HARD WARE er ror (code 50 at

address 101H) is returned by RPBASIC when a DATE

or TIM E function is performed. Use ONE RR to trap for

this error and report the problem.

Accuracy is about 1 minute/month and is not adjustable.

Hour s are exp ressed in 24-hour fo rma t.

Refer to the RPBASIC -52 Software Supplement for

more com mand information.

COMMANDS

The clock module is installed by first r emoving the IC in

U5. Then, install the DS1216DM into the socket. Install

the RAM chip into the socket. W hen installing a 32K

RAM chip, the top two pins in the DS1216DM ar e left

open.

The following is a list of RPBASIC-52 commands for

the calendar/clock.

Comm and

Function

Refer to CHAPTER 5 for information about using battery

backed RAM and jumper setting when installing a 512K

RAM.

DATE

DAT E(n)

TIME

Sets date and tur ns on mod ule

Return s date

Sets time

TIME (n)

Returns time

WARNING: An additional modification to the

DS1216DM is necessary when

installing a 512K RAM. C ontact

Remote P rocessing for de tails.

SETTING DATE AND TIME

Set the date to turn on the clock module. Date and time

are set w hile running a progr am or in the imm ediate

mode. Date and time are treated as number s and not

strings. To set the date and time:

DATE 95,11,28

TIME 13,23,43

The time is set to 1:23:43 PM.

Page 7-1 RPC-320

CALENDAR/CLOCK

SECTION 7

Figure 7-1 Calendar/Clock

Page 7-2 RPC-320

DISPLAY PORT

SECTION 8

INTRODUCTION

Additional power wiring is usually required for LCD

graphic and VF charac ter displays. This infor mation is

included with the display. Information content is display

dependent. Below is general information on both.

RPBASIC-52 and the RP C-320 interface to a variety of

displays:

VF (vacuum florescent) character

LCD (liquid crystal) character

LCD gr aphics

Graphic displays require additional voltages not

generated on the RPC-320. These must be supplied

externally. An external contrast adjustment may be

necessary. Y ou may be able to connect these through

screw term inal block P5.

Character display sizes range from four lines by 20

characters to four lines by 40 characters. The graphics

display supports 160 x 128 pixels. Remote Processing

supplies these displays with appropr iate cables. A

contrast adjustment fo r LC D char acter displays is built

into the card.

VF c haracte r displays r equire + 5 volts and gr ound to

connector P5. This may in the form of external wires

from the main power connector on the board or power

supply.

If a display is not used, this port may be used for general

purpose digital I/O. P ort A and part of port B from an

82C55 are available. See CONNE CTOR D ISPLAY PIN

OUT below for ava ilable lines.

Additional information for commands m entioned in the

following text are found in the RPBASIC-52 Software

Supplem ent in this manual.

WRITING TO THE DISPLAY

The cable length to a display depends upon the amount

of current it requires. A significant amount of voltage

drop occurs with a long cable. V acuum florescent and

The display type must first be set using the CON FIG

DISPLAY command. T he DISPLAY com mand is used

to print information.

LCD graphics cables should b e less than 2 feet.

charac ter LC D display c able should be less than 5 feet.

PROGRAMMING EXAMPLE

The example below is for a four line by 20 character

LCD display. Even though DISPL AY statements do not

end with a comma (, ), a < cr> < lf> sequence is not

sent. Use C R to force a return to the beginning of the

line. A CR does not scroll characters on a display. You

must position the cursor to the next line.

10 CONFIG DISPLAY 1

20 STRING 200,30

30 $(0) = "Hello world"

40 DISPLAY (1,2),$(0)

Figure 8-1 Display interface

CONNECTING DISPLAYS

The display port is designed to supply all the lines

necessar y for V F and L CD displays. A custom cable

connects the RPC-320 to the display.

Displays purchased from Remote Processing include a

cable. You simply connect the 20 pin connector to the

RPC-320 L CD display port and the other end into the

display.

Page 8-1 RPC-320

DISPLAY PORT

SECTION 8

DISPLAY TYPES

COMMANDS

RPBASIC-52' s software driver is based upon the

characteristics of the display family. Compatible VF and

LCD displays are shown below:

The following RPBASIC-52 com mands are used for the

display.

Manu fact.

Model

Type

Comm and

Function

Optrex

IEEE

DMC 40457

DMC 40202

3601-90-080

DMF 682N

LCD 4 x 40

LCD 2 x 40

VF 4 x 20

LCD 160W x 128D

CLEAR DISPLAY

CLEAR DISPLAY LINE Clears curr ent line

CONFIG DISPLAY

Clears entire display

Specifies display type to

use

Optrex

DISPLAY

Prints the string at the

row and collum specified

DISPLAY CONNECTOR PIN OUT

The display port uses an 82C5 5 for data and contr ol.

The table below lists a pin number and its intended

function. A display may not use all lines even though

they are available.

8255

Function

Port/line

Logic + 5V

Digital ground

A/4

Contrast voltage

A/6

A/5

B/4

B/3

B/2

A/7

A/1

A/0

A/3

A/2

B/7

B/6

B/5

Reset (from invertor)

Write

Read

CS (from invertor)

Com mand/ data

Halt

Contrast adjust

Alternate power

Power gr ound

J4 is available for additional I/O if a display is not used.

Port A is configured as an input or output. P ort B must

be configur ed as an outpu t if a 17 key or larger keypad is

used. Use the L INE B comm and to access this part.

I/O bank is 4.

Pins 18, 19, and 20 are for the LCD -5003 and other

graphic displays.

Page 8-2 RPC-320

KEYPAD PORT

SECTION 9

INTRODUCTION

10 STRING 200,20

20 $(0) = "123A456B789C*0#D"

30 P = 1

40 PF = 0

50 PRINT "Enter a number from the keypad",

16, 20, or 24 position keypads are plugged into keypad

port J5. Keys are arra nged in a m atrix for mat. A key is

recogn ized when a row and a colum n connect.

REM Rest of program continues

REM Scan keypad and update display

RPBASIC-52 scans and debounces the keypad every 50

ms. Keypad pr esses are returned as a num ber fr om 1 to

24 using the KE YPA D function . Ke ypad scanning is

always active and cannot be turned off. Up to 8 key

presses are buffered.

200 GOSUB 500

210 IF PF = 0 THEN 200

220 PRINT

230 PRINT "Entered string is: ",$(2)

240 PF = 0

250 GOTO 50

Keypad presses are multi-tasked using ON KEYPAD.

When a key is pressed, the program br anches to the

subroutine.

500 A = KEYPAD(0)

510 IF A = 0 THEN 500

520 IF A = 12 THEN 600 : REM Process clear

530 IF A = 16 then 700 : REM process enter

540 A=ASC($(0),A)

550 PRINT CHR(A),

560 ASC($(2),P) = A

570 P = P + 1

Keypads from Rem ote Processing simply plug into J5.

The keypad cable length should be limited to less than 5

feet.

580 ASC($(2),P) = 13

590 RETURN

600 REM Clear input string

610 $(2) = ""

620 P = 1

630 RETURN

700 REM Enter processing

710 P = 1

720 PF = 1

730 RETURN

Program explanation

Line 20 defines the keypad legend. Letters may be

redefined as necessary.

Figure 9-1 Keypad connector

Line 30 sets the position counter used to insert characters

into the string.

PROGRAMMING EXAMPLE

Line 200 w aits for a key press. The enter ed string is

printed.

The following example sets up RPBASIC to scan a 16

position keypad. T he results are echo ' ed when a key is

pressed. Press the 'D' key to enter.

Line 500 checks the keypad. If a character is available,

it processe s it.

Lines 540-590 update the input string and position. A

< CR> is inserted to mark the end of string.

Page 9-1 RPC -320

KEYPAD PORT

SECTION 9

The second example uses ON KEYPAD to generate an

interrupt every time a key is pressed.

KEYPAD PORT PIN OUT - J5

The keypad port uses ports B and C from an 82C55.

Lowe r por t C is configured as an input. Upper port C

and port B bits 0 and 1 are ou tputs.

10 ON KEYPAD1000

500 GOTO 500

The table b elow lists J5' s pin out, 82C55 p ort and bit,

and its intended function.

1000 PRINT KEYPAD(0)

1100 RETURN

82C55

Function

Line 10 sets up the tasker for keypad interrupts to start at

line 1000. Line 500 loops on itself for demonstration

purposes.

Port/ bit

C/0

C/6

C/5

C/1

C/2

C/4

C/7

C/3

B/0

B/1

Row 1

Column 3

Column 2

Row 2

Line 1000 prints out the key pad position pressed.

Elements of the pr evious program can be com bined with

this one to produce keypad strings.

Row 3

Column 1

Column 4

Row 4

Column 5

Column 6

Page 9-2 RPC -320

ANALOG INPUT

SECTION 10

usually affects readings on other channels.

DESCRIPTION

Grounding

The RP C-320 has 8 single ended analog input channels.

These channels are used to measure voltages from

transducers, 4-20ma current loops, thermistors, etc.

Input voltage r ange is 0 to 5 volts or ±2.5V with 12 bit

(4096 count) resolution. Signals are single ended or

differential. Input impedance is 100K ohms to ground.

Analog ground is somewhat isolated from digital ground.

While the ground plane is connected between the two,

analog ground is a virtual "island" connected only in one

place to digital ground. To minimize noise pickup, the

sending device should be connected to analog ground

(located at the analog input ter minal str ip). W hen both

analog and digital grounds come from the same device,

you will have to play around with the g rounds to

determine which scheme provides the best performance

for your system.

Reference IC U 14 has a voltage output that corresponds

to the IC tem peratur e. T his output ma y be used to

measure ambient temperature.

Two am plifiers are available to signal condition inputs.

By installing appr opriate r esistors and capacitor s, inputs

are buffered, amplified, and filtered.

This chapter begins with basic information on connecting

and using ana log inputs. Later, descriptions of how to

measure voltages other than 2.5 or 5 volts, temperature

measurem ent, data logging, using the amplifiers, and

calibration are presented.

CONNECTING ANALOG INPUTS

All analog inputs interface through connector P4.

Additional compone nts, such as r esistors and capacitors,

may be conne cted directly to the screw terminals.

Figure 10-1 Analog I/O

INITIALIZATION

For gr eatest accuracy, connect unused inputs to ground.

Each channel is initialized for 0-5V, single ended input

upon power up. Inputs can be reconfigured for eight

single-ended, four differential, or a mixture of single-

ended and differential inputs. Input voltage ranges are 0

to 5V or ±2.5V for any single-ended channel or

differential pair. Syntax is:

R17 is adjusted to trim accuracy to your system. See

Calibration later in this chapter for more information.

Tem peratur e output or other signa l input may go directly

to channel 0 via header H1. See Temperature

Measurement and Amplifiers below.

CONFIG AIN channel,mode, range

Overvoltage conditions

Inputs are protected over voltage protected. M aximum

voltage on 1 channel is 25 volts. M aximum voltage for

2 to 4 channels is 12 volts. Total input current m ay not

exceed 16 ma on all channels. Each channels input

current is computed by the following formula:

channel ranges from 0 to 7 for single-ended inputs.

Differential inputs use adjace nt channels.

mode defines single-ended or differential. 0 =

differential, 1 = single-ended.

I_in= (V_in- 5)/4700

Differential inputs operate in a special way. The

polarity of the input signal must be connected as shown

for an even or odd channel. For exam ple, when channel

is odd (1, 3, 5, or 7), channel 0 m ust be more negative

than channel 1 otherwise a 0 is returned. Should the

relative polarity change, configure the even channel for

differential input and perform an AIN on it. Use the

When V_in

5 volts, no curr ent flows into the channel.

NOTE: An over-voltage condition on one channel

Page 10-1 RPC -320

ANALOG INPUT

SECTION 10

Perform a conver sion as normal:

following tables for differ ential inputs.

A = AIN(0)

When channel = odd

The difference between channel 0 and 1 is returned.

When channel 1 is more positive than channel 0, the

result is zero. The differenc e is read on channel 1 by

performing:

Pol.

CH #

channel

A = AIN(1)

When channel = even

Pol.

CH #

Single-ended, ±2.5V input

CONFIG AIN channel,1,0

channel

The result is 0 for -2.500V input, 2048 for 0. 000V, and

4095 for + 2.4988V.

When range = 0, the input is ±2.5 volts and a 1 = 0 to

5 volts.

Acquiring Analog Data

Differential Mode

When differential m ode is specified, inpu ts are actually

pseudo-differential. What this means is that a ground

reference is needed. For example, you cannot place a

battery be tween channel 0 and 1 and get an accurate

reading. T he (-) input must be referenced to ground.

An example of where pseudo-differential works is an

output from a bridge network.

Analog data is accessed with the AIN function. The

syntax is:

A = AIN(channel)

This function assigns the analog value of a channel to the

variable; A in this case. The value returned is alway s in

the 0 to 4095 range bec ause the converter is 12 bits.

Power up or reset default configures inputs to the 0-5V

range, single ended.

A pseudo-differential input subtracts the DC component

from an input. T he IC maker recomm ends the (-) input

remain stable within 1 count with respect to ground for

best results. Connecting a 0. 1 uF capacitor from the (-)

input to grou nd wor ks well.

To view the result of a conversion in the command

mode, type:

When operating in differential mode, r elative + and -

voltages must be connected to specific inputs. When

inputs are reversed, a conversion returns a 0. When the

relative voltage changes, perform a conversion on the

alternate c hannel. CON FIG AIN is perfor med on b oth

channels.

print ain(0)

The result at channel 0 is returned. T he returned value

will always be in the 0 to 4095 range. When using a

channel in the ±2. 5V ra nge, the value returned is

interpreted differently. Zero count is now -2.500V,

4095 is + 4.9988, and 2048 is 0.000V.

Pairs of channels can be differ ential while others single

ended. Thus, if channel 0 and 1 are differ ential inputs,

channels 2-7 may be single ended.

Use the following formulas to convert a returned number

to a voltage:

Examples u sing CON FIG AIN

0 - 5V A = .001221 * AIN(channel)

Below are sample syntaxes for CO NFIG AIN

Differential, 0 to + 5V input

±2.5V A = .001221 * ain(channel) - 2.5

The AIN function require s about 1.5 ms to convert the

data. Additional time is needed to store the data. The

example below takes 255 data samples and stores them

CON FIG AIN 0,0, 1

CON FIG AIN 1,0, 1

Page 10-2 RPC -320

ANALOG INPUT

SECTION 10

period of time (several seconds if possible).

into an array which requires 6 bytes per entry. The

second example takes only two byes per entry, can save

to extended m emor y, but requir es a longer time to get a

data point.

Another way is place a capacitor (0.1 to 1 mfd) between

the input terminal and ground. This is useful when the

source resistance is high.

The pr ogram below take s about 1. 5 ms per data point.

Noise is, by definition, random . If you wer e to plot out

the deviations from a norm, it would roughly resemble a

bell shaped curve. Exper iments on the RPC-320 have

shown that 99% of the readings are w ithin the ±3 count

reading and 60% are ±1 count. Noise readings were

made with all inputs shorted to ground.

10 DIM A(254)

20 FOR X=0 TO 254

30 A(X) = AIN(0)

40 NEXT

This next program saves data above MTOP . M TOP was

previously set. However, if you have 128K or more

RAM, you can POKE into segment 1 or higher. It takes

approximately 2 mS per data point and is not affected by

the memory location saved to.

Temperature Measurement

Refer ence IC U14 outputs a voltage pr oportiona l to its

temperature. This information is used to determine

approximate ambient temper ature in order to turn on

fans or heater s.

10 A = 30000

20 FOR X=0 TO 999

30 POKE W0,A,AIN(0)

40 A=A+2

50 NEXT

Vo = 2.1(T + 273)

Data is retrieved using the PEEK W command.

T = Vo/2. 1 - 273

Noise Notes

T = Vc * .581428 - 273

An input channel can appear noisy (change readings at

random) if unused inputs are allowed to float. To

minimize noise (and increase accura cy), connect all

unused inputs to ground.

Where T =

Vo =

Vc =

Te mp er atu re in °C

Output voltage in mV

Count returned using AIN , 0 -

5V range

A high im pedance inp ut is, by definition, sensitive to

voltage pickup. Noise is minimized by running wires

away from A C power lines. A low impedance voltage

source helps to reduce noise pick up. Shielded cable can

help reduce noise from high impedance sources. Make

sure the shield is not used for power ground. U sing the

shield for power ground defeats its purpose.

At 25°C the output voltage is approximately 625 mV, or

506 counts. Vo is expressed as a milli-volt number

(625) not .625.

The output from U14 must be buffered. To measure

temperature, jumper H1[1-3]. Remove resistor R13.

Jumper H1[2-4]. Tem perature is read at analog channel

0. T he sensitivity is incr eased by jum pering H 1[5-7] to

ground. T his will double the output voltage and any

voltage changes due to temperature.

Wire pairs can also be twisted. 5-6 twists/foot provides

a reasonable amount of noise cancellation.

Noise is defined in this section as any random change

from a known input. The amount of noise you can

expect under nor mal operatin g circumstances is ±3

counts for any input range.

100 T = AIN(0) * .581428 - 273

T retur ns the tempera ture in celsius.

Sensitivity is increased by jumpering H1[5-7] to ground.

This doubles the output voltage and any voltage changes

due to temperature.

One way to compensate for noise is to take a number of

samples and average the results. Taking 6 or more

samples would, in theory, cancel out any effects of

noise. A problem with this is noise tends to group

together. Ta king 6 readings at one time might show no

change fr om the norm. Another 6 reading s might be all

high. If possible, try to spread out readings over a

NOTE: Tem peratur e measu rem ents are a pproxim ate

and are meant as a guide to indicate ambient

temperature.

Page 10-3 RPC -320

ANALOG INPUT

SECTION 10

The outpu t from the temperatur e sensor v aries fr om unit

to unit. Self heating effects as well as supply voltage

will change the output.

Page 10-4 RPC -320

ANALOG INPUT

SECTION 10

The outpu t voltage fro m the tem peratur e sensor is

doubled by jumpering H1[5-7]. While this does not

change the range the unit operates at, it does change

increase temperature m easurement sensitivity.

Data logging on a timer tick

Some applications require that data is read at fixed

intervals. The ONTICK con struct is used to take data in

intervals from 0. 01 to 327 seconds. The exam ple below

takes 1 sample per second until 100 samples have been

obtained.

10 DIM A(100)

20 ONTICK 1,500

30 REM THE REST OF YOUR PROGRAM

40 REM CONTINUES

80 GOTO 30

500 A(N) = AIN(3)

510 N=N+1

520 IF N = 100 THEN ONTICK 0,500

530 RETI

MEASURING HIGHER VOLTAGES

Voltages higher than + 5V are measur ed by inserting a

series r esistor to the inp ut.

The table below shows resistor values for some input

voltages using the 0-5V range.

Maximum

Input Voltage

Resistor

20K

12.5

150K

380K

Use the following formula to determine the series

resistance necessar y for a m aximum voltage input:

Rs = Vi * 20000 - 100000

Rs = Vi * 40000 - 100000

0 - 5V range

0 - 2.5V r ange

Rs is the resistor value in ohms in ser ies with the input.

Vi is the maximum input voltage. W hen Rs is negative

or zero, a series resistor is not necessary.

A high Rs v alue can cause noisy readings. This is

because the resistor acts as an antenna. To reduce noise,

place a 0.1 mfd to 1 mfd capacitor betw een the input

terminal and ground.

NOTE: When an input voltage exceeds the input range,

other channel values are affected.

Page 10-5 RPC -320

ANALOG INPUT

SECTION 10

K = 200/3276

K = .06105

CONVERTING ANALOG

MEASUREMENTS

Inputs are converted to "real numbe rs" by perfor ming

scaling calculations in the program. The AIN function

returns values from 0 to 4095. To change these numbers

into something more meaningful, use the following

formula:

There is one addition factor. Since the lowest value read

is 1 V, this offset is subtracted from all readings. A 1 V

offset is 1/5 of 4095 counts, or 819. The program line

then becomes:

200 A=.06105*(AIN(N)-819)

var = K * AIN(n)

Note that if the current loop line breaks, a negative value

is returned.

n is the analog channel to read. K is the scaling

constant. K is obtained by dividing the highest number

in the range of units by the maximum AIN count (4095).

AMPLIFIERS

Example 1: To measure the results of an A/D

conversion in volts and the voltage range is 0 to 5V,

divided 5 by 4095 to obtain K.

Two operational amplifiers are available to signal

condition inputs. Each amplifier is configured as shown

below.

K = 5/4095

K = .001221

Your program could look something like:

1000 C = .001221 * AIN(N)

Example 2: Y ou want to measure a 0 to 200 PSI

pressure transducer w ith a 0 to + 5V output. Divide 200

by 4095 to obtain the constant K.

K = 200 / 4095

K = .0488

Figure 10-2 Amplifier circuit

The code can then look like:

1000 B = .0488 * AIN(0)

Amplifiers are accessed through header connector H1.

Pin out is as follows:

Measuring 4-20 mA current loops

H1 pin

Function

Curr ent loops is a convenient way to transmit a value

and still assure the integrity of the signal. If the line

should break, a 0 volt (or nearly so) is returned.

Temper ature output from U14

To channel 0 analog input

Non-inverting input, amplifier A

Output from amplifier A

Inverting input, amplifier A

Approximately + 7V supply (5 ma

maximum)

A 4-20 ma curr ent loop is converted to 1 - 5V by placing

a 250 ohm resistor across the input of the chan nel to

ground.

Cur rent loop r eadings ar e conver ted to engineer ing units

by performing scaling as described earlier. Since the

measur ement r ange is 1 to 5V , the count ran ge is

reduced by 20% to 3276.

Ground

Non-inverting input, amplifier B

Approximately -7V supply (5 ma

maximum)

Inverting input, amplifier A

Output from amplifier A

If pressure were measured:

Page 10-6 RPC -320

ANALOG INPUT

SECTION 10

Voltage outputs from pins 6 and 10 are generated by the

RS-232 chip U8. Both of these voltages go through a

100 ohm resistor to H1-10 and H1-6. Pin 10 goes to 0

volts when operating the board in IDLE m odes 1 or 2.

Pin 6 goes to about + 5 volts. These voltages may be

used to supply power to very low pow er amplifier s.

CALIBRATION

The A /D comes fa ctory calibrated for a 0 to 5V input.

This range is chan ged by adjusting R17. You can adjust

the range to 5.12V. This is useful when the input is 0 -

5V and you want to know when the input is over-range.

To calibrate or adjust the voltage reference:

1. Connect the voltmeter ground to a GN D point

on the Analog IN terminal strip. Make sure

there are no other connections to the analog

ground.

2. Connect the voltmeter ' + ' lead to U14, pin 6.

3. Adjust R5 for 5.00 VDC or other voltage as

desired. D o not exceed 5.2 or go below 4. 8

volts.

COMMANDS

The following RPBASIC-52 com mands are used for

analog I/ O. Mor e inform ation is found in the appendix

of this manu al.

Comm and

Function

AIN(n)

CON FIG AIN (n)

Returns analog value.

Configures analog input

channels

Page 10-7 RPC -320

WATCHDOG TIMER

SECTION 11

DESCRIPTION

The watchdog timer is used to reset the RPC -320 if the

program or CPU "crashes" . The time r is built into the

80C320 CP U. Timed access requirem ents built into the

CPU make it high ly unlikely an er rant pr ocessor would

cancel a watchdog timer.

The watchdog should not be used in loops which do not

end quickly or ar e of indetermina te duration unless a

WDOG command is included. An example of an

indeterminate loop is one that waits for a port condition

to change.

The timer is set by executing a WDOG n command. n is

0, 1, or 2. 0 turns off the timer. 1 sets the watch dog

time to 380 ms while 2 sets it to 2.8 seconds. Executing

WDO G by itself resets the timer. WD OG must be

executed pe riodically to prevent a reset.

When the watchdog times out, a softwar e reset is

perfor med. The effect is lines at J3 do not ch ange as in

a power-up or har dware reset. Lines at P6, display, and

keypad port ar e reset to power -up conditions.

EXTERNAL RESET

The card is reset externally by mom entarily shorting

W10[1-2]. R eset is also achiev ed by shor ting W10-2 to

ground. Maintain this short for at least 10 ms. The card

will then reset for abo ut 350 ms.

Page 11-1 RPC-320

EXTERNAL INTERRUPT

SECTION 12

INTERRUPT CHARACTERISTICS

DESCRIPTION

Interrupts are negative going edge sensitive. This means

an interrupt is detected when P2-INT goes low or when a

voltage is applied to P2-ISOA and ISOB for at least 10

micro-seconds. To detect a subsequent interrupt, the

line must go high at P2-INT or voltage removed at P 2-

ISOA/ B for at least 10 micro -seconds.

There are tw o sources of interrupts the ONITR statement

respond s to: Inter nal and exter nal. External interr upts

are off-card. Internal interrupts are from the counter.

External interrupts are used to "w ake-up" the card from

any of the IDLE modes. This feature is useful in power

conserving m odes.

The status of the interrupt or ISOA/B line is read using

the following statement:

Signals to P2-ISOA and P2-ISOB are optically isolated.

P2-IN T is a non-isolated, TTL input. Only 1 inter rupt is

selected. Available interrup ts are show n in the table

below.

100

A = LINE(8)

When A = 1, P 2-INT is high or no v oltage is applied to

ISOA /B.

W8 P in

1-2

Description

The P2-INT goes to the output from the opto-isolator I1.

Since this line goes to a 10K ohm pull-up resistor,

additional devices can generate an interrupt only if they

are "wired-or".

External TTL level through P2 (INT)

or optically isolated through P2 (ISOA

& ISO B)

3-4

5-6

7-8

Carry or borr ow pulse from counter

Carry pulse from counter

Borrow pulse from counter

PROGRAM EXAMPLE

The following program enables interrupts and goes to a

routine to service it. Jumper W8[1-2] and bring P2-INT

to ground to see this example work.

ONINT selection is through jumper W8. This chapter

descr ibes using external inter rupts P 2-INT or ISOA /B.

When a counter is used, then external interr upts may not

be used. See Chapter 14, C ounter Inputs for more

information.

10 ONITR 500

30 GOTO 30

500 PRINT "Got Interrupt"

510 RETI

External interrupt at P2-INT is TTL level compatible.

Bringing this line low generates an interrupt when

ONITR is enabled.

Line 510 is necessary to re-enable all interru pts. If this

line is not executed, but a RETURN is used, then

ONT ICK is also d isabled. If your pr ogram requir ements

require disabling all interrupts for a time, then the RETI

statement can be executed within any subroutine to re-

OPTICALLY ISOLATED INTERRUPT

ISOA and ISOB provide an isolated, higher voltage

input. Neither input is connected to ground or + 5V and

is isolated to the card by at least 500 volts.

An external voltage of at least 3.5 volts, any polarity,

will generate an interrupt. Higher voltages may be used

provided a ser ies resistor is in line to the supply. Use

the following formula to determine the series resistor

needed.

Rs = (Vi - 6) / .005

Where: Vi = input voltage

No series resistor is needed when Rs is negative.

Page 12-1 RPC-320

EXTERNAL INTERRUPT

SECTION 12

Figure 12-1 Optically isolated and TTL interrupts

enable interrup ts.

Page 12-2 RPC-320

MULTI-MODE COUNTER

SECTION 13

Specifically, RPBASIC w rites a 2 to the MCR (M aster

Control Register), reads the 3 counter bytes from the OL

(Output latch), and converts it to the proper internal

BASIC form at.

DESCRIPTION

The 24 bit multimode counter is capable of up/down,

binary, divide-by-n, and quadrature inputs. C ount

frequency is DC to 20 M hz. The R PC-320 uses an LSI

Com puter Syste ms LS7166. Its data sheet is foun d in

Appendix C.

100 A = COUNT(0)

COUNT statement writes a 24 bit number to the PR

(Preset r egister) only. Its syntax is:

The COU NT function and statement are used to read

from and wr ite to the counter . L INEB is used to

program the chip for various op erating mode s.

200 COU NT 0, D

To transfer this number to the counter, execute the

following in the program:

An interrupt, using ONITR, may be detected on a carry,

borr ow, or either event. The event is jumper selectable

through W8. When the counter is used, external

interrupts (see Chapter 12) may not be used.

LINEB 6,1,8

The counter number is always 0 on the RPC -320.

W8 P in

1-2

Description

LINEB is used to access specific registers within the

chip. Accessing control and status registers is shown

below. C ounter bank is 6.

External TTL level through P2-6 or

optically isolated through P3

Carry or borrow pulse from counter

Carry pulse from counter

3-4

5-6

7-8

100 A = LINEB(6,1) : REM Read OSR

200 LINEB6,1,X

Borrow pulse from counter

Line 200 writes to OCCR, ICR, QR, MCR, and ICR

6 and 7 in the byte written to the chip.

Signals connect to the counter via P2. Use the following

table to determine signal input to the LS7166.

Name

Function

Program examples

This code resets the counter and enables the inputs. The

count is printed once a second. To see the count change,

momentarily bring " A IN" or "B IN" on P2 to ground.

When " B IN" is gr ounded, the count decrem ents.

A IN

B IN

GND

LOAD

GATE

Count input A

Count input B

Ground

Load counter/latch (LCTR/LLTC)

Gate/reset counter (ABGT/RCTR)

10 LINEB6,1,32

20 LINEB6,1,64+8

ONTICK 1,500

GOTO 40

Input lines (A IN), (B IN), LOAD, and GATE are

pulled to + 5V through a 10K resistor.

500 PRINT COUNT(0)

510 RETI

PROGRAMMING

Line 20 can be shortened somewhat. 64 selects the ICR

(Input contr ol register ) and 8 enables inputs. 72 could

have been used.

The LS7166 is capable of several operating modes, all of

which are not discussed here. See Appendix C for this

chips operating modes. W hat are shown are exam ples of

how to program this chip.

NOTE: Be sure to initialize the counter chip before

using COU NT com mands. Failure to do so

returns m eaningless results.

The COU NT function returns the current counter value.

Page 13-1 RPC-320

MULTI-MODE COUNTER

SECTION 13

The following program example returns a frequency.

Input signal is at "A IN".

COMMANDS

The table below lists commands used with the counter.

100

110

120

130

140

500

510

520

530

LINEB 6,1,32

LINEB 6,1,72 : REM enable inputs

ONTICK 1,500

IDLE

GOTO 130

A=COUNT(0) : REM get count

C=A-B : REM figure change from last time

PRINT "Frequency = ",A

B=A

Comm and

Function

COU NT(0)

COUNT 0,n

Returns value in counter

Writes value to counter

RETI

The fir st frequen cy read will always be a bit off. This is

because of the time required to initialize ONTICK.

Subsequent readings are more accurate.

Accuracy is increased by stretching readings to every 10

seconds. This is necessary w hen higher accura cy is

needed.

Other factors affecting accurate readings in this program

include serial communications and ONITR statement. If

ONITR is in process, ONTICK is delayed until ONITR

is finished.

The problem w ith this routine is periodically, a large

negative number is returned. This is because the

multimode counter has rolled over. This is corrected by

periodica lly reseting the CNTR or transfer ring PR to

CN TR. Refer to the data sheet, Appendix A for counter

operating mo des.

This program sets up the LS7166 to cause an interrupt

when a pr eset numb er of cou nts is reached. W8[7-8] is

jumpered to interrupt on a borrow.

LINEB 6,1,132

COUNT 0,1000

LINEB 6,1,8

LINEB 6,1,72

ONITR 500

: REM write to CNTR

: REM transfer PR to CNTR

: REM enable A/B counters

100 PRINT COUNT(0) : REM print progress

110 GOTO 100

500 PRINT "In Interrupt"

510 RETI

Line 10 sets OCCR to divide by N. Line 50 enables

interrupts. Line 100 prints the counter. When pulses

are applied to the A input, the count will go down. When

1000 pulses are detected at A input, the message in line

500 is printed.

Page 13-2 RPC-320

POWER MANAGEMENT

SECTION 14

grossly distorted.

DESCRIPTION

There are thr ee power mana gement modes. Each mode

affects the way RPBASIC operates. T he IDLE

command is used to control how the card operates

NOTE: Delay printing out the R S-232 ports for at least

20 ms (20 instructions) after exiting IDLE 1 or

IDLE 2. These chips generate RS-232 voltages

and require a "pow er up" time. Failure to do

so could result in garbled ch aracters.

Default mode is full power. All commands, timers, and

interrupts function. IDLE command is not used.

NOTE: The < Ctl> -C break char acter is not

recognized in any of the IDLE modes.

Norm ally this is not a problem except during

progr am deve lopment. If the program is

executing an IDLE statement and it won' t

respond to any interrupts, pressing the reset

button is the only w ay to exit.

There are a number of ways to exit the IDLE mode in

conjunction with ONITR. Refer to Chapter 12, External

Interrupt and Chapter 13, Multi-mode Counter for ways

to generate interr upts. IDLE 2 is restricted on the type

of interrupt. T he signal at P2-INT must return to a high

state befor e the next IDLE 2 command is executed. (P2-

INT is also controlled by the multi-mode counter and

optically isolated interrupt, described in Cha pter 12 and

13.) If it does not go high, IDLE 2 mode w ill exit in

approximately 3 ms. This is due to a characteristic of

the A6 mask revision in the Dallas 80C320 CPU. A

general rule is to keep the negative pulse at P2-INT

greater than 50 ns but less than 3 ms.

Exit IDLE 2 by applying a low going pulse at the INT

input at P2. The pulse width should be 50 ns minimum.

The other IDLE modes re quire a pulse width of at least

1 micro-second. Optical interrupt ISOA/B may also be

used to exit any of the IDLE modes. The pulse w idth

needs to be at least 10 micr o-seconds.

IDLE or IDLE 0 waits until an ONTICK or ONITR

interrupt occur s. Serial I/ O oper ates norm ally. U se this

comm and when you wan t your pr ogram to "hang out"

until something happens. The RPC-320 operates under

full power.

FURTHER POWER REDUCTION

Some applications require the least amount of power

possible. You m ay rem ove cer tain IC' s from the card to

do this. The table below lists the IC 'U' number,

approximate curr ent consumption (in shutdown and run

mode), and function.

IDLE 1 reduce s power by 30% . H ere the C PU " shuts

down" but the internal timers are still operating.

ONT ICK and ON ITR will cause the card to come out of

power down m ode. Howe ver, the RS-232 se rial por ts

are disabled. C haracters in the transmitter buffer are not

sent out and incoming characters are ignored.

Curr ent

Shutdown

Function

Run

10 mA

100 uA

400 uA RS-485 interface

IDLE 2 is the lowest power mode. T he CPU, internal

timers, ser ial ports, and oscillator are tur ned off. Only

interrupts responding to ONITR wake up the processor.

Cur rent consumption is less than 5 ma with no signals

going into or coming from the RPC -320.

U14

1.2 ma Reference for U 15,

temperature reference.

U15

5 ma

10 uA Analog to digital

converter

IDLE 2 also has a number of operating restr ictions.

This mode shuts dow n the RS-232 rece iver/dr iver IC, so

no character s can come in or go out. T his IC also

supplies current for the amplifiers and analog to digital

converter. Do not apply negative voltages to the analog

input in this mode. The tick timer is shut off. However,

the real tim e clock m odule, if installed, continues to

operate.

U11

U17

10 mA

1 ua

Digital I/O at J3

Display output, keypad

scanner.

30 mA

10 uA RS-232 driver/receiver,

power supply for analog

to digital converter,

amplifiers

NOTE: The RS-232 receiver is shut down in IDLE

modes 1 and 2. A ny characters sent to the

RPC-320 dur ing this time are ignored or

Page 14-1 RPC -320

POWER MANAGEMENT

SECTION 14

Curr ents are maximum and minimum as specified by the

manufacturer. Min-max curr ent ranges "guaranteed" by

the device manufacturer have a tremendous range, often

by a factor of 10 or m ore. Current abov e is “typical” .

Some current consumption is difficult to determine.

Digital outputs, for example, will draw virtually no

current under no load conditions, but can supply 15 ma

to each output if requir ed. Ther efore, inputs and outputs

connected to the card will affect its current consumption.

Some chips, such as U 9, will not draw m uch current

unless there is activity on the R S-485 por t.

Board current consumption may be affected by the

setting of jump er W 7. T his jumper determ ines if inputs

at J3 are pulled up or down. When set to pull up inputs,

each line forced low increases current consumption by

50 uA. If all inputs are tied to + 5V or ground,

rem oving jump er W 7 may dr aw less cur rent.

The application program IC in U6 may be changed to a

29C040. This 512K byte memory draws 200 uA less

current than a 32K byte one.

Any contr ol line from P2 to gr ound dra ws 500 uA due to

the 10K pull-ups. Lines at P6 are pulled to + 5V

through a 10K resistor. Each low line draws 500 uA.

The contrast adjustment (R18) can be removed or

adjusted for minimum cur rent.

Program Examp le

This examp le makes the RP C-320 go into its lowest

power mode.

10 ONITR 500

other code

100 IDLE 2

200 GOTO 100

500 PRINT "In interrupt"

510 RETI

Page 14-2 RPC -320

TECHNICAL INFORMATION

SECTION 15

Opto isolated input ISOA/ISOB

ELECTRICAL SPECIFICATIONS

Isolated voltage s to 250 volts peak may be a pplied to this

input. A series resistor is necessary for voltages above

12V.

CPU

80C320, 22. 1184 Mhz clock

Memory

Keypad input

RPBASIC-52, 32K RO M, jumperable for 64K.

Type: 27C256 Access time: 80 ns or faster.

10 lines accept a 16 position matrix keypad. Scanning

and debounce performe d in RPBASIC-52.

Program ming and data is 32K or 128K RAM standard,

512K Optional.

Display output

14 digital and 6 power and ground lines used to control

LCD , VF , and LC D graphics displays. D isplays

supported in RPBASIC-52.

RAM optionally battery backed up. Battery life is 5-10

years depending upon RAM size, type, and oper ating

temperature and time.

Serial ports

Two RS-232D serial ports. All have RxD , TxD , and

CTS lines. COM 0 has only these lines. COM1 also has

RTS. COM 1 configurable to RS-232 or RS-422/485.

Term ination network for RS-422/485 available. Baud

rates fr om 300 to 3 8.4 K are pr ogram mable. Length

fixed at 8 bits, no parity, 1 start and stop bit.

Maximum BASIC progra m is 62K

Battery backed using D S1216DM , w hich also acts as a

real time clock. Can also use DS1213C or D to battery

back ram.

Digital I/O

EPROM and programmer

The RPC -320 has 34 digital I/O lines. 24 are from J3,

which is a ge neral pur pose por t.

Accepts 29C 256, 29 C010, 29C040 or equivalent flash

EPR OM from Atmel.

Size: 32K (29C256), 128K(29C010), 512K(29C040)

The specifications below a re for digital I/ O at P6 and J3

except for the eight high current lines at J3.

Calendar/Clock

Optional DS-1216DM installed in socket U5.

Accur acy to 1 minute/m onth

Supported by RPBASIC

Drive curr ent

2.5 ma m aximum per line,

sink or source. TTL

compatible.

Expected life 3 to 5 years depending upon RAM size

installed, temperature, and operating time.

Output low voltage 0.45V m ax at 2.5 mA , 1V

max at 15 mA for opto rack.

Output high v olts

2.4V m inimum, sink or source

at rated cu rren t.

Watchdog timer, reset

Watch dog timer resets C PU whe n enabled.

Time between re sets is 380 ms or 2.8 seconds

Push button reset. Exter nal reset through W10.

All digital input lines are TTL compatible.

High cu rrent output at J3

Power requireme nts

+ 5 ±5% at 95 ma operating.

Current consumption is less than 5 ma in IDLE 2 mode,

all components installed.

8 of the 24 lines can drive up to 500 ma at 50V. Refer

to CHAPTER 6, D IGITAL AND OPTO PORTS for

limitations.

Curr ent is less than 1 ma when analog and RS-485 chips

(U14, 15,16, and 9) are removed.

RS-232 voltages generated on card.

Current consumption does not include any opto-modules

or other acc essories.

High current output at L8

L8 sinks up to 2 amperes at 50 V olts. Sw itching is

through a "zero" ohm FE T switch.

Page 15-1 RPC -320

TECHNICAL INFORMATION

SECTION 15

MEMORY AND I/O BANK MAP

JUMPER DESCRIPTIONS

Memory

A * after a jumper position indicates fa ctory def ault is

jumpered.

Description

RPBASIC-52, U4

RAM , U 5, 32K

128K

Address

0000H - 7FFFH

00000H - 07FFFH

00000H - 1FFFFH

00000H - 7FFFFH

Jumper

Description

W1[1-2]*

W1[2-3]

RAM size 32K, 128K

RAM size 128K

512K

I/O Bank

RAM (U5)

EPRO M (U6)

not used

Digital I/O (U11)(J3)

Display & keypad (U17)

Control & L 0-L8 (U19)

Counter (U13)

not used

W3[1-3],[2-4]

W3[3-5],[2-4]

W3[3-5],[4-6]

29C040 F lash

29C010 Flash

29C256 F lash

W2[1-3],[2-4]

W2[3-5],[4-6]* Flash EPROM selected

EPROM selected

W4[1-2]

W4[2-3]*

COM 1 RS-485 input

COM 1 RS-232 input

MECHANICAL SPECIFICATIONS

W5[1-2]*

W6[1-2]*

RS-485 terminator

Size

4.6" x 7.0"

W7[1-2]*

W7[2-3]

J3 resistors pulled up

J3 resistors pulled down

4 mounting holes are 0.250 x 0.250 inches from each

edge. Mounting holes are 0.124 inch in diameter.

W8[1-2]

W8[3-4]

W8[5-6]

W8[7-8]

External or isolated interrupt

Counter carr y or borrow interrupt

Counter carr y interrupt

Board thickness:

Board m aterial:

0.062

FR-4

Counter borr ow interrupt

W9[1-2]*

Do not autorun

W9[no jumper] Autorun on reset

W10[1-2] Exter nal reset inp ut.

Page 15-2 RPC -320

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