Omron C500-ASC04 User manual

C500-ASC04 ASCII Unit
Operation Manual
Revised February 2001

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No. 6182
OMRON Corporation
Please read and understand this manual before using the product. Please consult your OMRON
representative if you have any questions or comments.
Read and Understand this Manual
Warranty and Limitations of Liability
WARRANTY
OMRON's exclusive warranty is that the products are free from defects in materials and workmanship for a
period of one year (or other period if specified) from date of sale by OMRON.
OMRON MAKES NO WARRANTY OR REPRESENTATION, EXPRESS OR IMPLIED, REGARDING NON-
INFRINGEMENT, MERCHANTABILITY, OR FITNESS FOR PARTICULAR PURPOSE OF THE
PRODUCTS. ANY BUYER OR USER ACKNOWLEDGES THAT THE BUYER OR USER ALONE HAS
DETERMINED THAT THE PRODUCTS WILL SUITABLY MEET THE REQUIREMENTS OF THEIR
INTENDED USE. OMRON DISCLAIMS ALL OTHER WARRANTIES, EXPRESS OR IMPLIED.
LIMITATIONS OF LIABILITY
OMRON SHALL NOT BE RESPONSIBLE FOR SPECIAL, INDIRECT, OR CONSEQUENTIAL DAMAGES,
LOSS OF PROFITS OR COMMERCIAL LOSS IN ANY WAY CONNECTED WITH THE PRODUCTS,
WHETHER SUCH CLAIM IS BASED ON CONTRACT, WARRANTY, NEGLIGENCE, OR STRICT
LIABILITY.
In no event shall the responsibility of OMRON for any act exceed the individual price of the product on which
liability is asserted.
IN NO EVENT SHALL OMRON BE RESPONSIBLE FOR WARRANTY, REPAIR, OR OTHER CLAIMS
REGARDING THE PRODUCTS UNLESS OMRON'S ANALYSIS CONFIRMS THAT THE PRODUCTS
WERE PROPERLY HANDLED, STORED, INSTALLED, AND MAINTAINED AND NOT SUBJECT TO
CONTAMINATION, ABUSE, MISUSE, OR INAPPROPRIATE MODIFICATION OR REPAIR.

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No. 6182
Application Considerations
SUITABILITY FOR USE
OMRON shall not be responsible for conformity with any standards, codes, or regulations that apply to the
combination of products in the customer's application or use of the products.
At the customer's request, OMRON will provide applicable third party certification documents identifying
ratings and limitations of use that apply to the products. This information by itself is not sufficient for a
complete determination of the suitability of the products in combination with the end product, machine,
system, or other application or use.
The following are some examples of applications for which particular attention must be given. This is not
intended to be an exhaustive list of all possible uses of the products, nor is it intended to imply that the uses
listed may be suitable for the products:
• Outdoor use, uses involving potential chemical contamination or electrical interference, or conditions or
uses not described in this manual.
• Nuclear energy control systems, combustion systems, railroad systems, aviation systems, medical
equipment, amusement machines, vehicles, safety equipment, and installations subject to separate
industry or government regulations.
• Systems, machines, and equipment that could present a risk to life or property.
Please know and observe all prohibitions of use applicable to the products.
NEVER USE THE PRODUCTS FOR AN APPLICATION INVOLVING SERIOUS RISK TO LIFE OR
PROPERTY WITHOUT ENSURING THAT THE SYSTEM AS A WHOLE HAS BEEN DESIGNED TO
ADDRESS THE RISKS, AND THAT THE OMRON PRODUCTS ARE PROPERLY RATED AND INSTALLED
FOR THE INTENDED USE WITHIN THE OVERALL EQUIPMENT OR SYSTEM.
PROGRAMMABLE PRODUCTS
OMRON shall not be responsible for the user's programming of a programmable product, or any
consequence thereof.

No. 6182
3
Disclaimers
CHANGE IN SPECIFICATIONS
Product specifications and accessories may be changed at any time based on improvements and other
reasons.
It is our practice to change model numbers when published ratings or features are changed, or when
significant construction changes are made. However, some specifications of the products may be changed
without any notice. When in doubt, special model numbers may be assigned to fix or establish key
specifications for your application on your request. Please consult with your OMRON representative at any
time to confirm actual specifications of purchased products.
DIMENSIONS AND WEIGHTS
Dimensions and weights are nominal and are not to be used for manufacturing purposes, even when
tolerances are shown.
PERFORMANCE DATA
Performance data given in this manual is provided as a guide for the user in determining suitability and does
not constitute a warranty. It may represent the result of OMRON's test conditions, and the users must
correlate it to actual application requirements. Actual performance is subject to the OMRON Warranty and
Limitations of Liability.
ERRORS AND OMISSIONS
The information in this manual has been carefully checked and is believed to be accurate; however, no
responsibility is assumed for clerical, typographical, or proofreading errors, or omissions.

iv

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Notice:
OMRON products are manufactured for use according to proper procedures by a qualified operator
and only for the purposes described in this manual.
The following conventions are used to indicate and classify warnings in this manual. Always heed the
information provided with them.
DANGER Indicates information that, if not heeded, is likely to result in loss of life or serious injury.
WARNING Indicates information that, if not heeded, could possibly result in loss of life or serious injury .
Caution Indicates information that, if not heeded, could result in relatively serious or minor injury , dam -
age to the product, or faulty operation.
OMRON Product References
All OMRON products are capitalized in this manual. The word “Unit” is also capitalized when it refers
to an OMRON product, regardless of whether or not it appears in the proper name of the product.
The abbreviation “Ch,” which appears in some displays and on some OMRON products, often means
“word” and is abbreviated “Wd” in documentation in this sense.
The abbreviation “PC” means Programmable Controller and is not used as an abbreviation for any-
thing else.
Visual Aids
The following headings appear in the left column of the manual to help you locate different types of
information.
Note Indicates
information of particular interest for ef ficient and convenient operation
of the product.
1, 2, 3... 1. Indicates lists of one sort or another, such as procedures, checklists, etc.
OMRON, 1991
All rights reserved. No part of this publication may be reproduced, stored in a retrieval system, or transmitted, in any
form, or by any means, mechanical, electronic, photocopying, recording, or otherwise, without the prior written permis-
sion of OMRON.
No patent liability is assumed with respect to the use of the information contained herein. Moreover, because OMRON is
constantly striving to improve its high-quality products, the information contained in this manual is subject to change
without notice. Every precaution has been taken in the preparation of this manual. Nevertheless, OMRON assumes no
responsibility for errors or omissions. Neither is any liability assumed for damages resulting from the use of the informa-
tion contained in this publication.

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TABLE OF CONTENTS
vii
PRECAUTIONS . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
1 Intended Audience . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
2 General Precautions . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
3 Safety Precautions . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
4 Operating Environment Precautions . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
5 Application Precautions . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
SECTION 1
Hardware . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
1-1 Front Panel . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
1-2 Back Panel . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
1-3 ASCII Unit Internal Configuration . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
1-4 System Configuration . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
1-5 Mounting . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
SECTION 2
Data Allocations . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
2-1 Bits and Words . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
2-2 Data Configuration . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
SECTION 3
Programming and Communications . . . . . . . . . . . . . . . .
3-1 Programs . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
3-2 Program Transfer . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
3-3 Running the BASIC Program . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
3-4 Assembly Routines . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
SECTION 4
BASIC Programming . . . . . . . . . . . . . . . . . . . . . . . . . . . .
4-1 Program Configuration . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
4-2 Commands, Statements, and Functions . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
SECTION 5
Assembly Programming . . . . . . . . . . . . . . . . . . . . . . . . . .
5-1 Assembly Language Programming . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
5-2 Terminology and Formatting . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
5-3 Monitor Mode Commands . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
SECTION 6
Program Examples . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
6-1 Timing Considerations . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
6-2 Programs in Two-word Mode . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
6-3 Programs in Four-word Mode . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
6-4 Assembly Language Examples . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Appendices
A Standard Models . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
B Specifications . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
C PC Statements and Refresh Timing . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
D Formatting and Data Conversion . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
E Memory Map . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
F Troubleshooting . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
G BASIC Commands, Statements, and Functions . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Glossary . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Index . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Revision History . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

ix
About this Manual:
This manual describes the installation and operation of the C500-ASC04 ASCII Unit. The ASCII Unit can
be mounted to a C500, C1000H, C2000H, or CV-series PC to control ASCII data I/O through a BASIC
program
stored in the ASCII Unit. The C500-ASC04 must be used with a PC that supports the I/O READ
and I/O WRITE instructions (READ(88) and WRIT(87) or READ(190) and WRIT(191)).
It has been assumed in the writing of this manual that the reader is already familiar with the hardware,
programming, and terminology of OMRON PC’ s. If a review of this information is necessary , the reader
should refer to the appropriate OMRON PC manuals for assistance.
This
manual contains the following sections. Please read this manual completely and be sure you under -
stand the information provide before attempting to install and operation the ASCII Unit.
Section 7 explains the external hardware of the ASCII Unit and how it connects to a PC system.
Section 8 explains the format of the PC memory area accessed by the ASCII Unit. This area is where the
ASCII Unit and the PC exchange data.
Section 9 explains how the ASCII Unit program and the PC program communicate as well as how to write,
load, save, and run an BASIC program for the ASCII Unit.
Section 10 presents the BASIC programming language used by the ASCII Unit. Since many of the BASIC
commands are nonstandard and peculiar to an ASCII Unit-PC system, it is recommended that even read -
ers already proficient in BASIC pay careful attention to this section.
Section 1 1 explains the assembly language programming environment and how it relates to the ASCII
Unit’s BASIC program. It also explains in detail how to write, edit, and run an assembly language program.
Section 12 presents programming examples that are meant to bring together all of the concepts pres-
ented in this manual. Most of the programs deal with data transfer and illustrate how the ASCII Unit and
the PC work together in various applications. Also in this section are several examples used to illustrate
the execution sequence of the hardware during execution of the ASCII Unit and PC programs.
Detailed technical information not immediately necessary for the understanding of a particular section
has been put into one of the seven appendices and should be used for reference when needed. For a list
of the appendices, see the table of contents.
Note In this manual, ladder diagram instructions are given by mnemonics with the function codes in
parentheses
following them. The first function code is for C-series PCs and the second function
code is for CV-series PCs. For example, in MOV(21/030) (the MOVE instruction), the function
code for C-series PCs is 21; for CV-series PCs, 030.
WARNING Failure to read and understand the information provided in this manual may result in
personal injury or death, damage to the product, or product failure. Please read each
section
in its entirety and be sure you understand the information provided in the section
and related sections before attempting any of the procedures or operations given.
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xi
PRECAUTIONS
This section provides general precautions for using the Programmable Controller (PC) and related devices.
The information contained in this section is important for the safe and r eliable application of the PC. Y ou must r ead
this section and understand the information contained before attempting to set up or operate a PC system.
1 Intended Audience . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
2 General Precautions . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
3 Safety Precautions . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
4 Operating Environment Precautions . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
5 Application Precautions . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

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4Operating Environment Precautions
xii
1 Intended Audience
This manual is intended for the following personnel, who must also have knowl -
edge of electrical systems (an electrical engineer or the equivalent).
•Personnel in charge of installing FA systems.
•Personnel in charge of designing FA systems.
•Personnel in charge of managing FA systems and facilities.
2 General Precautions
The user must operate the product according to the performance specifications
described in the operation manuals.
Before using the product under conditions which are not described in the manual
or applying the product to nuclear control systems, railroad systems, aviation
systems, vehicles, combustion systems, medical equipment, amusement
machines,
safety equipment, and other systems, machines, and equipment that
may have a serious influence on lives and property if used improperly , consult
your OMRON representative.
Make sure that the ratings and performance characteristics of the product are
sufficient
for the systems, machines, and equipment, and be sure to provide the
systems, machines, and equipment with double safety mechanisms.
This
manual provides information for programming and operating OMRON PCs.
Be sure to read this manual before attempting to use the software and keep this
manual close at hand for reference during operation.
WARNING It is extreme important that a PC and all PC Units be used for the specified
purpose and under the specified conditions, especially in applications that can
directly or indirectly affect human life. You must consult with your OMRON
representative before applying a PC System to the abovementioned
applications.
3 Safety Precautions
WARNING Do not attempt to take any Unit apart while the power is being supplied. Doing so
may result in electric shock.
WARNING Do not touch any of the terminals or terminal blocks while the power is being
supplied. Doing so may result in electric shock.
WARNING Do not attempt to disassemble, repair , or modify any Units. Any attempt to do so
may result in malfunction, fire, or electric shock.
4 Operating Environment Precautions
Caution Do not operate the control system in the following locations:
•Locations subject to direct sunlight.
•Locations subject to temperatures or humidity outside the range specified in
the specifications.
•Locations subject to condensation as the result of severe changes in tempera -
ture.

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5Application Precautions
xiii
•Locations subject to corrosive or flammable gases.
•Locations subject to dust (especially iron dust) or salts.
•Locations subject to exposure to water, oil, or chemicals.
•Locations subject to shock or vibration.
Caution Take
appropriate and suf ficient countermeasures when installing systems in the
following locations:
•Locations subject to static electricity or other forms of noise.
•Locations subject to strong electromagnetic fields.
•Locations subject to possible exposure to radioactivity.
•Locations close to power supplies.
Caution The
operating environment of the PC system can have a large ef fect on the lon -
gevity and reliability of the system. Improper operating environments can lead to
malfunction, failure, and other unforeseeable problems with the PC system. Be
sure that the operating environment is within the specified conditions at installa -
tion and remains within the specified conditions during the life of the system.
5 Application Precautions
Observe the following precautions when using the PC system.
WARNING Always heed these precautions. Failure to abide by the following precautions
could lead to serious or possibly fatal injury.
•Always ground the system to 100 Ω or less when installing the Units. Not con -
necting to a ground of 100 Ωor less may result in electric shock.
•Always turn OFF the power supply to the PC before attempting any of the fol -
lowing.
Not turning OFF the power supply may result in malfunction or electric
shock.
•Mounting or dismounting I/O Units, CPU Units, Memory Units Power Sup -
ply Units, or any other Units.
•Assembling the Units.
•Setting DIP switches or rotary switches.
•Connecting cables or wiring the system.
•Connecting or disconnecting the connectors.
Caution Failure
to abide by the following precautions could lead to faulty operation of the
PC or the system, or could damage the PC or PC Units. Always heed these pre -
cautions.
•Fail-safe measures must be taken by the customer to ensure safety in the
event
of incorrect, missing, or abnormal signals caused by broken signal lines,
momentary power interruptions, or other causes.
•Always use the power supply voltages specified in this manual. An incorrect
voltage may result in malfunction or burning.
•Take appropriate measures to ensure that the specified power with the rated
voltage and frequency is supplied. Be particularly careful in places where the
power supply is unstable. An incorrect power supply may result in malfunction.
•Install external breakers and take other safety measures against short-circuit -
ing in external wiring. Insuf ficient safety measures against short-circuiting may
result in burning.

5Application Precautions
xiv
•Do not apply voltages to the Input Units in excess of the rated input voltage.
Excess voltages may result in burning.
•Do not apply voltages or connect loads to the Output Units in excess of the
maximum switching capacity. Excess voltage or loads may result in burning.
•Disconnect the functional ground terminal when performing withstand voltage
tests. Not disconnecting the functional ground terminal may result in burning.
•Be sure that all the mounting screws, terminal screws, and cable connector
screws are tightened to the torque specified in this manual. Incorrect tighten -
ing torque may result in malfunction.
•Leave the label attached to the Unit when wiring. Removing the label may re -
sult in malfunction if foreign matter enters the Unit.
•Remove
the label after the completion of wiring to ensure proper heat dissipa -
tion. Leaving the label attached may result in malfunction.
•Double-check all wiring and switch settings before turning ON the power sup -
ply. Incorrect wiring may result in burning.
•Wire correctly. Incorrect wiring may result in burning.
•Mount Units only after checking terminal blocks and connectors completely.
•Be sure that the terminal blocks, Memory Units, expansion cables, and other
items with locking devices are properly locked into place. Improper locking
may result in malfunction.
•Check the user program for proper execution before actually running it on the
Unit. Not checking the program may result in an unexpected operation.
•Confirm that no adverse ef fect will occur in the system before attempting any of
the following. Not doing so may result in an unexpected operation.
•Changing the operating mode of the PC.
•Force-setting/force-resetting any bit in memory.
•Changing the present value of any word or any set value in memory.
•Resume
operation only after transferring to the new CPU Unit the contents of
the DM Area, HR Area, and other data required for resuming operation. Not
doing so may result in an unexpected operation.
•Do not pull on the cables or bend the cables beyond their natural limit. Doing
either of these may break the cables.
•Do
not place objects on top of the cables or other wiring lines. Doing so may
break the cables.
•Use crimp terminals for wiring. Do not connect bare stranded wires directly to
terminals. Connection of bare stranded wires may result in burning.
•When replacing parts, be sure to confirm that the rating of a new part is correct.
Not doing so may result in malfunction or burning.
•Before touching a Unit, be sure to first touch a grounded metallic object in order
to discharge any static built-up. Not doing so may result in malfunction or dam -
age.

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SECTION 1
Hardware
This section describes the external hardware of the ASCII Unit. The front and back panels of the ASCII Unit contain switches,
buttons, connectors, and indicators which enable the user to setup, control, and monitor ASCII Unit operations. The ASCII
Unit’s internal configuration as well as a typical system configuration are also illustrated.
1-1 Front Panel . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
1-2 Back Panel . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
1-3 ASCII Unit Internal Configuration . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
1-4 System Configuration . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
1-5 Mounting . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

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1-1 Front Panel On the front panel of the ASCII Unit, there are six indicator lights, the reset
switch,
the ST ART/ST OP switch, two RS-232C connectors, and a battery com -
partment. In addition, behind the LED Display Panel, is an 8-pin DIP switch used
for setting various control parameters.
Ports The front panel of the ASCII Unit contains two RS-232C ports. These ports
are used for connecting peripheral I/O devices to the ASCII Unit. Both ports
can be used for communication devices such as printers, terminals, and mo-
dems. Only port 1 can be used for uploading or downloading a BASIC pro-
gram. The standard configuration is a personal computer connected to port 1
and a printer or other I/O device connected to port 2.
Switches The START/STOP switch is a toggle switch and is used for initiating and halt-
ing execution of the ASCII Unit program.
The
RESET switch is used for resetting the ASCII Unit.
Battery Compartment The battery compartment holds the C500-BAT08 Battery.
Front Panel
LED display
Indicates the operating
status of the ASCII Unit.
RESET switch
Resets the ASCII Unit
START/STOP switch
Starts/stops BASIC
program execution.
DIP switch
DIP switch is visible when the
indicator panel is removed.
RS-232C connector port 1
Connects peripheral devices. Is generally
used to input the BASIC program but can be
used for other peripheral devices as well.
RS-232C connector port 2
Connects peripheral devices. Cannot be
used to input a BASIC program. Is generally
used for a printer or other RS-232C devices.
Battery compartment
Holds the C500-BAT08 Battery.
The following table describes the ASCII Unit’s indicators.
Name Indication Function
RUN Lit (green) Lit when the ASCII Unit is operating normally. Unlit if an error
occurs.
T/R for ports 1 and 2 Blinking (green) Blinks during data transmission (port 1 and port 2).
ERROR 1 (port 1)
ERROR 2 (port 2) Lit (red) Lit if a reception buffer overflows or an error such as parity error occurs (see note), or while the ASCII Unit is waiting for specific
transmission conditions to be satisfied.
BASIC Lit (green) Lit while the BASIC program is running.
Blinking (green) Blinks when the BASIC program stops, or when the ASCII Unit is
waiting for input while the BASIC program is running.
Unlit (green) Unlit when in monitor mode.
BAT ERR Blinking (red) Blinks when the battery voltage has fallen below the rated level or
if the battery is not inserted correctly.
4CH Lit (green) Lit when the ASCII Unit is set for 4-word mode. Unlit when the
ASCII Unit is set for 2-word mode.
Indicator LEDs
Front Panel Section 1-1

3
Note When a reception buf fer overflows or transmission error occurs, the red indicator
is lit and will not be turned of f even if the transmission error or reception buf fer
overflow is corrected, because the error log must be kept. T o turn of f the indica -
tor, execute the CLOSE instruction or stop the program.
In order to access the front panel DIP switch, the indicator cover must be re-
moved
with a standard screwdriver as shown in the illustration below . T o set the
DIP switch, the power to the ASCII Unit must be OFF . The DIP switch must be set
before the ASCII Unit is mounted to the PC. Make sure the power to the PC is of f
when mounting the ASCII Unit.
Standard
Screwdriver
Front Panel DIP Switch
Front Panel Section 1-1

4
DIP Switch Settings
Manual start mode
In this mode, the BASIC program is
not started upon power application.
To start the program, either press
the START/STOP switch or issue a
start command from the personal
computer connected to port 1.
OFF
ON : 0 : 1 12345678
Start mode
Pin No. 1Function
Setting
0
1
Automatic start mode
In this mode, the BASIC program
is started automatically on power
application.
Automatic program transfer from EEPROM to RAM
Pin No. Function
Set this pin to “0” if only the
RAM is to be used.
2
Set this pin to “1” to automati-
cally transfer the program
from the EEPROM to RAM on
power application or reset.
0
1
Setting
Program No.
Pin No. Function34
00
10
01
11
No. 1
No. 2
No. 3
Setting
Screen size
Pin No. Screen Size
Setting 40 columns x 7 lines
40 columns x 8 lines
40 columns x 15 lines
40 columns x 16 lines
80 columns x 16 lines
80 columns x 15 lines
80 columns x 24 lines
80 columns x 25 lines
678
000
1
1
11
1
1
11
111
00
00
0
00
0
0
1
These pins select which program will be executed on power
application or reset. The program number can be changed
later with the PGEN command.
Specifies 2 or 4 word setting for
the Data Section.
Pin No. Function5
0
1
Setting Two word setting. Choose this setting
to use WRIT(87/191)/READ(88/190)
Four word setting. This setting is used
when the ASCII Unit is mounted to a
Slave Rack or when the PC does not
support WRIT(87/191)/READ(88/190).
Front Panel Section 1-1

5
1-2 Back Panel
The back panel of the ASCII Unit houses the PC connector and an 8-pin DIP
switch used for setting the communication parameters.
Back Panel
Mounting Screw
For mounting the ASCII Unit
to the PC Rack
Connector
Connects the ASCII Unit
to the PC
DIP Switch
For setting the communi-
cation parameters Mounting Screw
For mounting the ASCII Unit
to the PC Rack
Back Panel DIP Switch •Pins 1, 2, and 3 are used for setting the baud rate of port 1.
•Pins 4, 5, and 6 are used for setting the baud rate of port 2.
•Pins
7 and 8 are not used but must be set to OFF . If they are left ON, the Hard -
ware Test program will be executed and all RAM data will be lost.
The DIP switch settings are described in more detail in the following diagram.
OFF
ON : 0 : 1 12345678
Pin No.
Setting
456
000
1
1
11
1
1
11
111
00
00
0
00
0
0
1
Pin No.
Setting
123
000
1
1
11
1
1
11
111
00
00
0
00
0
0
1
300 bps
600 bps
1,200 bps
2,400 bps
4,800 bps
9,600 bps
300 bps
600 bps
1,200 bps
2,400 bps
4,800 bps
9,600 bps
19,200 bps
Baud rate selection for port 1
Baud Rate Not used (Always set these pins to OFF.)
Baud rate selection for port 2
Baud Rate
Back Panel Section 1-2

6
1-3 ASCII Unit Internal Configuration
The Common Memory can be accessed using the ASCII Unit’ s PC READ or PC
WRITE statements. It can also be accessed using the PC’ s WRIT(87/191) and
READ(88/190) instructions. I/O data can be accessed using the ASCII Unit’ s PC
GET, PC PUT, and ON PC statements. It can also be accessed using the
MOV(21/030) instruction.
The following figure illustrates these instructions and their relationship to the
Common Memory and the I/O data.
CPU
System
Memory
Work
Memory
BASIC
Program
Memory
BASIC Data
Memory
RS-232C
Interface
RS-232C
Interface
CPU I/O Bus Interface
Circuit
Common
Memory
I/O
Data
EEPROM
I/O
LED Indicators
DIP Switches
RESET START
/STOP
ASCII Unit
PC
RS-232C
Connectors
Port 1
Port 2
ASCII Unit Internal Configuration Section 1-3

7
1-4 System Configuration
The ASCII Unit can be mounted to any slot on the CPU Backplane. Before
mounting the ASCII Unit, the DIP switches must be set. Make sure that the pow -
er supply to the PC is turned OFF during installation of the ASCII Unit. A personal
computer used for entering the BASIC program should be connected to Port 1
and other peripheral I/O devices such as a printer or a display terminal can be
connected to Port 2 (refer to the following diagram). For more detailed informa -
tion on peripheral interface connections and timing, refer to Appendix B .
C500/C1000H/C2000H CV SeriesC120
C500
Expansion
I/O Rack
Plasma Display
Printer
Personal Computer
Bar-code Reader
1-5 Mounting
The ASCII Unit can be mounted to any I/O slot. The control panel must allow
enough space for the connectors, as shown in the figure below.
*1. Height of the ASCII Unit including the base (100
mm)
*2. Height of the ASCII Unit with an RS-232C con-
nector attached (approximately 160 to 180 mm)
Mounting Section 1-5