Remote Technologies RPC-320 User Manual
RPC-320 USER'S MANUAL REV 2
Copyright 1997, 1999 - Remote Processing Corporation.
All rights reserved. However, any part of this document
may be reproduced with Remote Processing cited as the
source.
The contents of this manual and the specifications her ein
may change without notice.
TRADEMARKS
RPBASIC-52™ is a trademark of Remote Processing
Corporation.
PC SmartLINK® is a trademark of Octagon Systems
Corporation.
BASIC-52© is a trademark of Intel Corporation.
NOTICE TO USER
The information contained in this manual is believed
correct. However, Remote Processing assumes no
responsibility for any of the circuits described herein,
conveys no license under any patent or other right, and
make no representations that the circuits are free from
patent infringement. Remote 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
determination as to fitness for a particular use.
Remote Processing Corporation' s general policy does not
recommend the use of its products in life support
applications where the failure or malfunction of a
component may 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 indemnifies Remote Pr ocessing against
all damages.
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
SECTION 1 OVERVIEW
DESCRIPTION ................... 1-1
MANUAL ORGANIZATION .......... 1-1
MANUAL CONVENTIONS ........... 1-1
Symbols and Terminology ......... 1-2
TECHNICAL SUPPORT ............. 1-2
SECTION 2 SETUP AND OPERATION
INTRODUCTION ................. 2-1
OPERATING PRECAUTIONS ......... 2-1
EQUIPMENT .................... 2-1
FIRST TIME OPERATION ........... 2-2
Using a PC ................... 2-2
Using a Terminal ............... 2-2
UPLOADING AND DOWNLOADING
PROGRAMS ................. 2-2
Editing program s and pro gram ming hints 2-3
WHERE TO GO FROM HERE ......... 2-4
TROUBLESHOOTING .............. 2-4
SECTION 3 SAVING PROGRAMS
INTRODUCTION ................. 3-1
SAVING A PROGRAM ............. 3-1
AUTORUNNING .................. 3-2
PREVENTING AUTORUN ........... 3-2
LOADING A PROGRAM ............ 3-2
CHANGING EPROM SIZE ........... 3-2
ALTERNATE EPROMS ............. 3-3
COMMANDS .................... 3-3
SECTION 6 DIGITAL AND OPTO PORTS
INTRODUCTION ................. 6-1
DIGITAL I/O PORTS ............... 6-1
Digital Port J3 ................. 6-1
Digital Port P6 ................. 6-2
High Current Port L8 ............ 6-2
Optically Isolated Input ........... 6-2
Digital I/O Commands ............ 6-2
High Curr ent Output ............. 6-3
Interfacing Digital I/ O to an opto- module
rack ..................... 6-4
Interfacing to switches and other devices 6-4
Digital I/O program ming exa mple .... 6-4
Pulse Width Modulation (PWM) ...... 6-5
COMMANDS .................... 6-6
SECTION 7 CALENDAR/CLOCK
DESCRIPTION ................... 7-1
SETTING DATE AND TIME .......... 7-1
COMMANDS .................... 7-1
SECTION 8 DISPLAY PORT
INTRODUCTION ................. 8-1
CONNECTING DISPLAYS ........... 8-1
WRITING TO THE DISPLAY ......... 8-1
PROGRAMMING EXAMPLE ......... 8-1
DISPLAY TYPES ................. 8-2
DISPLAY CONNECTOR PIN OUT ..... 8-2
COMMANDS .................... 8-2
SECTION 4 SERIAL PORTS
DESCRIPTION ................... 4-1
COM0 SERIAL PORT .............. 4-1
COM1 SERIAL PORT .............. 4-1
RS-422/485 OPERATING INFORMATION . 4-2
RS-422/485 Termination network ..... 4-2
Two wire RS-485 ............... 4-3
Multidrop Network .............. 4-3
ACCESSING SERIAL BUFFERS ....... 4-3
ACCESSING COM0 AND COM1 ....... 4-4
DISABLING CON TROL -C ........... 4-4
SERIAL PORT PIN OUT ............ 4-4
SECTION 5 RAM MEMORY
INTRODUCTION ................. 5-1
CHANGING M EMORY ............. 5-1
BATTERY BACKUP ............... 5-1
Checking the battery ............. 5-1
RESERVED MEMORY ............. 5-2
STORING VARIABLES IN RAM ....... 5-2
BLOCK DATA TRANSFER ........... 5-3
ASSEMBLY LANGUAGE INTERFACE .. 5-3
COMMANDS .................... 5-3
SECTION 9 KEYPAD PORT
INTRODUCTION ................. 9-1
PROGRAMMING EXAMPLE ......... 9-1
KEYPAD P ORT P IN OU T - J5 ......... 9-2
SECTION 10 ANALOG INPUT
DESCRIPTION ................... 10-1
CONNECTING ANALOG INPUTS ...... 10-1
Overvoltage conditions ............ 10-1
Grounding .................... 10-1
INITIALIZATION ................. 10-1
Differential Mode ............... 10-2
Examples using CON FIG AIN ....... 10-2
Acquiring Analog Data .............. 10-2
Noise Notes ................... 10-3
Temperature Measurement ......... 10-3
Data logging on a timer tick ........ 10-4
MEASURING HIGHER VOLTAGES .... 10-4
CONVERTING ANALOG MEASUREMENTS 10-4
Measuring 4-20 mA current loops ..... 10-4
AMPLIFIERS .................... 10-5
CALIBRATION .................. 10-5
COMMANDS .................... 10-5
Page ii RPC-320
TABLE OF CONTENTS
SECTION 11 WATCHDOG TIMER
DESCRIPTION ................... 11-1
EXTERNAL RESET ................ 11-1
DESCRIPTION ................... 11-1
OPTICALLY ISOLATED INTERRUPT ... 11-1
INTERRUPT CHARACTERISTICS ...... 11-1
SECTION 12 EXTERNAL INTERRUPT
DESCRIPTION ................... 12-1
PROGRAMMING ................. 12-1
Program examples .............. 12-1
COMMANDS .................... 12-2
SECTION 13 MULTI-MODE COUNTER
DESCRIPTION ................... 13-1
SECTION 14 POWER REDUCTION
FURTHER POWER REDUCTION ...... 14-1
Program Exam ple ............... 14-2
SECTION 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 Release for RPC320
V1.05 BSAVE returned a hardware er ror when ver ify
was bad. In fact, save was OK.
V1.06 LCD graphics hardware CS and reset are
reversed. Compensated in software.
V1.07 MTOP was useless in any system, especially a
32K RAM.
V1.08 Variables E and F would get dropped if
followed by a space.
Added delays between data strob e writes to
LCD display.
V1.09 STR(7, . . .) did not put in a CR into the put
string, causing longer strings to be printed.
V1.10 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 12/01/95
Added code to use Atmel 29C040A flash.
V1.13 01/12/96
Added code to support IEE centry series
display (3602-100-05420)
Includes PRINT #port
V1.14 03/28/96
Fixed bug in ON COUNT. Returns error for
lines > 100.
V1.15 06/26/96
PEEK$ could cause BASIC to lock up under
right conditions.
V1.16 02/18/97
ON LIN E OF F could cause program to lock up
if running ON COM.
Syntax error when DISPLAY used with IFTHEN-ELSE.
Added PE EKF a nd POKE F com mands.
Page iv RPC-320
OVERVIEW SECTION 1
DESCRIPTION
The RP C-320 is a n embed ded contr oller with a built in
Basic language. Several features make it suitable as a
stand alone unit:
Built in RPBASIC-52 programm ing language
supports hardware using single commands. On card
flash EPROM programm er can save up to 8
programs to 62K , or about 500K tota l.
High speed multimode counter accepts quadrature or
single inputs. Programmable for up/dow n, binary,
divide-by-N, X1, X2 or X4 quadr ature counting.
LCD charac ter and gr aphic display and keypad ports
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 current
outputs. 24 of these lines can connect to an opto
rack or other TTL devices.
Eight channel, 12 bit resolution analog to digital
converter. Configurable operational amplifiers
allow you to signal condition inputs or measure
temperature.
from your PC are downloaded using a serial
communication program.
MANUAL ORGANIZATION
This manual provides all the infor mation r equired to
install, configure, and operate the RPC-320. Using this
manual you will be able to:
Interface the RPC-320 to your IBM compatible PC
or terminal.
Understand the operation of the RPC-320 hardware
using RPBASIC-52 programming software.
This manual assumes you are familiar with some type of
BASIC programming software. The syntax used by
RPBASIC-52 is similar to BASIC-52. If you are not
experienced with any BASIC softwar e, y ou may w ant to
refer to books and training programs available through
your local book store. The BASIC-52 Programming
Manual has information and examples for the original
commands. Comm ands unique or modified by
RPBASIC-52 are in the Software Supplement in this
manual.
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
summary of related hardware commands is at the end of
most chapters.
32K, 128K, or 512K RAM battery backable to save
process variables and other data when power is off.
32K or 512K flash EPROM to save program s and
data.
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 programming language is standard. T his
language is a version of the original Intel BASIC-52. It
was modified for the RPC -320 for c ontrol, data
acquisition applications, and on board hardware features.
Program development can take place on your PC, using
your word processor, or on the RPC-320. Programs
Page 1-1 RPC-320
MANUAL CONVENTIONS
Information appearing on your screen is shown in a
different type.
Example:
RPBASIC-52 V1.0
Copyright Intel (1985) and Remote Processing
Bytes free: 27434
OVERVIEW SECTION 1
TECHNICAL SUPPORT
Symbols and Term inology
If you have a question about the RPC-320 or RPBASIC-
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.
WARNING:
Information under this heading warns you of
situations which might cause catastrophic or
irreversible damage.
52 and can' t find it in this manual, call us and ask for
technical support. Technic al support hours ar e 9 AM to
4 PM mountain time.
When you call, please have your RPC-320 and BASIC-
52 PROGRAMMING MANUAL ready. Many times it is
helpful to know what the RPC-320 is used for, so please
be ready to describe its application as well as the
problem.
W[-] Denotes jumper block pins.
< xxx> Paired angle brackets are used to indicate a
specific key on your keyboard. F or exam ple
< esc> means the escape key.
BASIC uses the decimal convention for designating
addresses and data. There are times when hexadecimal
notation is more convenient to use. Notation use d in this
manual and BASIC-52 is the ' H' character after the
number. 8CH stands for 8C hexadecimal.
Phone: 303-690-1588
FAX: 303-690-1875
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.
Page 1-2 RPC-320
OVERVIEW SECTION 1
Figure 1-1 System layout
Page 1-3 RPC-320
SETUP AND OPERATION SECTION 2
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 programming.
Requirements for uploading and downloading programs
are discussed. 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 common problems.
OPERATING PRECAUTIONS
The RPC -320 is designed to handle a wide variety of
temperature ranges at low power. These characteristics
require using CM OS components. CM OS is static
sensitive. To avoid damaging these components,
observe the following precautions before handling the
RPC-320.
1. Ground yourself before handling the RPC -320
or plugging in cables. Static electricity
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.
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 components.
EQUIPMENT
You will need the following equipment to begin using the
RPC-320:
RPC-320 embedded controller
PC with a serial port and com munications
program
or a
Terminal
VTC -9F ser ial cable
+ 5, 2 00 ma po wer su pply
Refer to Chapter 4, SERIAL PORTS, for wiring
information to make your own serial cable.
Figure 2-1 Connector location and function
Page 2-1 RPC-320
SETUP AND OPERATION SECTION 2
FIRST TIME OPERATION
Become familiar with the locations of connectors before
getting started. See Figure 2-1.
RPC -320 jump ers have been set at the fa ctory to op erate
the system immediately. For first time operation, do not
install any connectors or parts unless specified below.
Jumpers should be kept in default positions.
1. Connect power.
The RPC-320 needs + 5 ±0.25 volts at 100 ma.
Any well regulated supply that supplies 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 requirements increase w hen opto
modules are used. G4 opto modules require up to
20 ma each.
Make sure pow er is off. Connect the power supply
to one of the appropriately marked terminals on the
RPC-320. There two power connectors: P2 and P6.
Either one may be used to connect power.
2. Hook up to a PC or terminal.
Turn on your power supply. On power up a
copyright message is printed.
RPBASIC-52 V1.09
RPC-320
Copyright Remote Processing (1994)
Bytes free: 63740
65,536 bytes of additional expanded memory detected
512K byte EPROM installed
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 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 programming. T ype the
following program:
10 FOR X=0 TO 2
20 PRINT "Hello ",
30 NEXT
40 PRINT
You can use either a PC or CRT term inal to
program the RPC-320. Connect one end of the
VTC-9F connector to the 10 pin COM0 port on the
RPC-320. Refer to Figure 2-1 for connector
location.
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. The VTC-9F is designed to
plug directly into the 9 pin serial port connector on a
PC.
Start up your serial communication program. Set
comm unication par ameter s to 9600 baud, 8 data
bits, no parity, 1 stop.
Using a Terminal
Follow your terminal 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.
3. Power up.
Now type RUN. The system will display:
Hello Hello Hello
READY
>
Terminate a program by typing a < Ctrl> -C.
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.)
When uploading or downloading files, select ASCII text
format. XMODEM, YMODEM, or other formats are
not used.
RPBASIC-52 does not know when you are typing in a
program or if something else (laptop or mainfr ame) is
Page 2-2 RPC-320
SETUP AND OPERATION SECTION 2
sending it char acters. The upload and download file
does not contain any special codes; they are sim ply
ASCII characters.
Uploading programs is simply a process of receiving an
ASCII file. You or your program simply need to send
"LIST" to receive the entire program . The default baud
rate (9600) is rather high. The RP C-320' s baud rate is
changed using the CONFIG BAUD command.
Downloading a program requires transmitting an ASCII
file. As you type in (or download) a line, RPBASIC-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 programs pacing
character for downloading.
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 program lines.
increased download time.
Notice that you can write a program in lower case
characters. RPBASIC-52 translates them to upper case.
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
program is still pre sent. If you like to wr ite progr ams in
separate modules, you can download them separately.
Modules are assigned blocks of line numbers. Start 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.
RPBASIC-52 automatically formats a line for minimum
code space. For example, you could download the
following line of code:
10 fora= 0to5
When you listed this line, it would appear as:
10 FOR A=0 TO 5
Editing programs and program ming hints
Files uploaded or downloaded are simply ASCII DOS
text files. No special characters or control codes are
used. You may create and edit programs using your
favorite word processor or editor. Just be sure to save
files in DOS text form at.
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 major pena lty by wr iting a progr am this w ay is
Spaces are displayed but not stored. The following line:
10 for a = 0 to 5
would be compressed and displayed as in the second
example above. Spaces are removed. However, 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 EPROM. This is useful if you
are using a terminal to write program s. Simply type
SAVE. To retrieve a program, type LOAD.
Page 2-3 RPC-320
SETUP AND OPERATION SECTION 2
WHERE TO GO FROM HERE
If you want to do this: Turn to
Chapter
Save a program 3
Run a program at power up or
reset (autorun) 3
Know m ore abo ut serial por ts 4
Install a different RAM mem ory chip 5
Using RAM to save variables 5
Run an assembly language program 5
Configure digital I/O lines 6
Detect on/off switch status 6
Use high current outputs 6
Connect an external opto rack 6
Calendar/clock option 7
Connect Displays 8
Use a keypad 9
Measure voltages 10
Using inter rupts 12
Multi-mode counter 13
Use low power operation 14
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 AC, you
should see a momentary reading above 2 volts.
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.
4. Check the serial pa ram eters on y our 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 PC, you should see the
voltage go positive. Check the serial cable.
Transmitted signals from the PC or terminal are
from pin 5 on the 10 pin IDC connector.
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 tr oubleshooting hints
when you can' t get anything.
1. Check the power source. If it is below 4.65 volts at
the input power terminal, the RPC -320 will reset.
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 permanent reset. Check U7, pin
8. If it is high (about 5 volts), then the car d is in
reset. This 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 earlier in
this chapter. Connect an oscilloscope (preferred) or
a voltmeter to pin 3 (Txd) and gr ound. Pin 3 should
be -6 volts or more negative. (Pin 1 is designated
by the v symbol on the connecto r. 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
If all of this fails, call technical support listed in chapter
1.
Page 2-4 RPC-320
SAVING PROGRAMS SECTION 3
INTRODUCTION
Program s are stored in an EPRO M in socket U6. You
can store one or more programs, 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.
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 could
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 program size RPBASIC-52 can
run at one time is about 60K (including room for some
variable storage). The table below shows the maximum
capacity, maximum number of program lines, program
size at one time, and number of programs for an
EPROM type.
A flash EPROM is non-volatile (retaining data even
when power is disconnected), having an unlimited
number of read cycles and a limited number of write
cycles (about 1,000). A program is not run from
EPROM . It is transferred to RAM and run from there.
Programs in RAM can be m odified. They are saved to
EPROM for execution later.
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.
Figure 3-1 W3 autorun jumper
EPROM Max Prog Max No.
type Cap. lines Bytes Progs
29C256 30K 400 32K 1
29C040 509K 12400 62K 8
One program can call another using the EXECUTE n
command. n is from 0 to 7, depending upon the
EPROM type.
NOTE: When a program calls another, the old program
is completely replaced. All variables and
arrays are cleared (set to 0).
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 POKE to read
and save numbers and strings. See Chapter 5, STORING
VARIABLES IN RAM for more information.
Binary data is saved and read from the EPROM using
BSAVE and BLOAD commands. The EP ROM has a
limited number of write cycles (about 1000), so writing
information should be kept to a minimum.
This chapter discusses saving programs to EPROM (U6)
and program autoexecution.
SAVING A PROGRAM
For this example, assume you wanted to save the
following program:
20 FOR N= 0 TO 2
30 PRINT "Hello ",
40 NEXT
50 PRINT
If this progr am is not alr eady in, type it in now (or , if
you prefer, use your own program).
Type in the following command:
SAVE
RPBASIC-52 responds 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. Programming rate is roughly 600 bytes/second. If
the program is not successfully saved to EPROM, an
error message will appear.
Saving a program overw rites the pr evious one. Ther e is
no way to recover the old one since both occupy the
same space.
Using SAVE without any parameters is the same as
typing SAVE 0.
When a 128K (29C 010) or 5 12K (29C 040) EP ROM is
installed in U6, the SAVE segment parameter is 0 or 1
(128K) or 0 - 7 (512K). EXECU TE loads and runs the
program in the segment specified by SAVE. A 32K
(29C256) EPROM can run just one program.
Make the following modifications to the above program
as instructed to see how one program can call another.
There must be a 128K or 512K EPROM installed to run
this code.
Add the following lines:
10 PRINT "Program segment 0"
60 EXECUTE 1
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 start up progr am w as saved to
segment 0.
2. Remove jumper W9.
Push the reset button. The program will run. If there
are any error s, the program will stop (assuming you
have not trapped them with ON ERROR) 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.
PREVENTING AUTORUN
When troubleshooting a program, it' s not always
convenient for an autoexecute file to r un. This is
especially true if the program has been configured to
ignore the < ESC> or < Ctl-C> keys.
To prevent autorun, install jumper W9 before power up
or reset.
Now type:
SAVE 0
Now m odify lines 10 and 60 as follows:
10 PRINT "Program segment 1"
60 EXECUTE 0
Now type:
SAVE 1
To see the programs operate, type RUN. To stop program
execution, press < Ctrl-C> .
You may notice there is a slight pause between the
printed hello' s and pro gram segmen t number . This is
the time it takes to clear memory and load the program.
Loading and clearing take appr oximately 0.2 5 seconds in
a very small program up to 1 second in a very large
program.
LOADING A PROGRAM
There are tim es when y ou 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.
If you find out that modifications are not desirable or did
not work, you can restore the original program to RAM
using the LOAD command.
CHANGING EPROM SIZE
The RPC-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.
Type Size W3
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]
To change the EPRO M in U6, remove the IC and
replace it with the new one. When installing a 29C256,
pin 1 on the IC goes into socket pin 3. The top two
rows of pins are empty.
ALTERNATE EPROMS
Flash EPROMs are more expensive than UV er asable or
OTPs as of this writing. Large volume OEM' s may
wish to use lower cost EPRO Ms.
Program development must use flash EPROM s. When a
program is finished, the flash EP ROM is used as a
master. Use an exter nal progra m to duplicate progr ams.
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 preconfiguring W2 and W3 for your application.
COMMANDS
The following is a list of RPBASIC-52 commands used
for saving, loading, and executing programs and data.
These commands and functions are explained in the
Software Supplement in this manual.
Command Function
BLOAD Transfers binary data from
EPROM to RAM
BSAVE Transfers binary data from RAM
to flash EPROM
EXECUTE Loads, clears memory, then runs
a program from within a program
LOAD n Loads a program from EPROM
SAVE n Saves a program to flash EPROM
Page 3-3 RPC-320
SERIAL PORTS SECTION 4
DESCRIPTION
The RPC -320 has two serial ports that interface to a
printer, terminal, RS-485 network, or other serial
devices. This chapter describes their characteristics and
how to use them. Fre quent ref erence s are m ade to
commands listed in the BASIC-52 Programming Manual
or RPBASIC-52 Software Supplement in this manua l.
Please refer to these manuals for more information about
these commands.
Serial por ts are num bered C OM0 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.
Each port has a 256 character interrupt driven input and
output buffer. This allows sending characters without
slowing down program execution. However, if the
PRIN T buffer fills, pr ogram execution is suspended until
all PRINT characters are in the buffer. Both ports have
a 256 character input buffer. When more than 256
characters are received, excess ones are ignored.
COM0 SERIAL PORT
This port uses a VTC-9F serial cable to connect external
serial devices to the port. The 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 ou t is designed so it
plugs directly into the 9 pin serial port connector on a
PC.
CTS is a output and is set to high on power up.
Normally, 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. Line 400
sets CTS high and 500 sets it low, or to hold off.
400 LINEB 5,0,(LINEB(5,0) .AND. 247)
500 LINEB 5,0,(LINEB(5,0) .OR. 8)
COM 0 is normally used for program ming. D uring run
time it may be used as a general purpose serial port.
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.
CONFIG BAUD controls baud rate and RS-232/485
mode (COM1 only).
Figure 4-1 Serial port and jumper locations
ON C OM $ is useful whe n data is sent in pac kets. This
multitasking command branches to a BASIC subroutine
when a specific character or number of characters is
received.
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.
COM1 SERIAL PORT
COM 1 is either an RS-232 or RS-422/485 port. A
VTC-9F serial cable, described above, is used for RS232 level communications. RS-485 is from screw
terminals. COM 1 has 2 hardware handshaking lines,
CTS and RTS.
RTS is an input to the card. W hen RT S to the car d 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
If B = 32, the sender is not requesting information and
nothing further should be printed.
The CTS line may be set high or low to hold off
communication from a sending device. The sender must
recognize the CTS line. Line 400 sets CTS high and 500
sets it low, or to hold off.
Page 4-1 RPC-320
SERIAL PORTS SECTION 4
Figure 4-2 Network diagram
400 LINEB 5,0,(LINEB(5,0) .AND. 251)
500 LINEB 5,0,(LINEB(5,0) .OR. 4)
Jumper W4 determines if COM 1 receive is RS-232 or
RS-422/485.
W4[1-2] RS-485
W4[2-3] RS-232 (default)
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 transmitter is always on. RS485 mode turns on the transmitter only when sending.
Page 4-2 RPC-320
RS-422/485 OPERATING INFORMATION
RS-422/485 Termination network
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.
Only one slave device on a RS-485 network should have
a terminator installed. The host transmitter should also
have a 100 ohm resistor in series with a 0.1 mfd
capacitor. T he term inator on the RPC -320 includes pull
up and pull down resistors to prevent lines from floating
and generating er roneous char acters.
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