Omron CJ1W-SCU32 User manual

Machine Automation Controller
CJ-series
Serial Communications Units
Operation Manual
for NJ-series CPU Unit
W494-E1-03
CJ1W-SCU22
CJ1W-SCU32
CJ1W-SCU42
Serial Communications Units

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 permission 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 information contained in
this publication.
OMRON, 2011

1
Introduction
CJ-series Serial Communications Units Operation Manual for NJ-series CPU Unit(W494)
Introduction
Thank you for purchasing an CJ-series CJ1W-SCU@2 Serial Communications Units.
This manual contains information that is necessary to use with the NJ-series CPU Unit. Please read
this manual and make sure you understand the functionality and performance of the NJ-series CPU
Unit before you attempt to use it in a control system.
Keep this manual in a safe place where it will be available for reference during operation.
This manual is intended for the following personnel, who must also have knowledge of electrical sys-
tems (an electrical engineer or the equivalent).
•Personnel in charge of introducing FA systems.
•Personnel in charge of designing FA systems.
•Personnel in charge of installing and maintaining FA systems.
•Personnel in charge of managing FA systems and facilities.
For programming, this manual is intended for personnel who understand the programming language
specifications in international standard IEC 61131-3 or Japanese standard JIS B3503.
This manual covers the following products.
CJ-series Serial Communications Units
•CJ1W-SCU22
•CJ1W-SCU32
•CJ1W-SCU42
Intended Audience
Applicable Products

Relevant Manuals
2CJ-series Serial Communications Units Operation Manual for NJ-series CPU Unit(W494)
Relevant Manuals
There are three manuals that provide basic information on the NJ-series CPU Units: the NJ-series CPU
Unit Hardware User's Manual, the NJ-series CPU Unit Software User's Manual, and the NJ-series
Instructions Reference Manual.
Most operations are performed from the Sysmac Studio Automation Software. Refer to the Sysmac Stu-
dio Version 1 Operation Manual (Cat. No. W504) for information on the Sysmac Studio.
Other manuals are necessary for specific system configurations and applications.
Read all of the manuals that are relevant to your system configuration and application to make the most
of the NJ-series CPU Unit.
NJ-series User’s Manuals
Basic information
Introduction to NJ-series Controllers
Setting devices and hardware
Using motion control
Using EtherCAT
Using EtherNet/IP
Using CJ-series Units
Software settings
Using motion control
Using EtherCAT
Using EtherNet/IP
Programming
Using motion control
Using EtherCAT
Using CJ-series Units
Programming error processing
Testing operation and debugging
Using motion control
Using EtherCAT
Using EtherNet/IP
Maintenance
Using EtherCAT
Using EtherNet/IP
Using CJ-series Units
NJ-series CPU Unit Hardware User´s Manual NJ-series CPU Unit Software User´s Manual NJ-series Instructions Reference Manual NJ-series CPU Unit Motion Control User´s Manual NJ-series CPU Unit Built-in EtherCAT Port User´s Manual NJ-series Motion Control Instructions Reference Manual NJ-series CPU Unit Built-in EtherNet/IP Port User´s Manual NJ-series Troubleshooting Manual CJ-series Special Unit Operation Manuals for NJ-series CPU Unit
Troubleshooting and managing
errors in an NJ-series Controller
Use the
relevant
manuals for
references
according to
any error that
occurs.

3
Manual Configuration
CJ-series Serial Communications Units Operation Manual for NJ-series CPU Unit(W494)
Manual Configuration
NJ-series CPU Unit Hardware User's Manual (Cat. No. W500)
Section Description
Section 1
Introduction This section provides an introduction to the NJ-series Controllers and their features, and gives the NJ-series Controller specifications.
Section 2
System Configuration This section describes the system configuration used for NJ-series Controllers.
Section 3
Configuration Units This section describes the parts and functions of the configuration devices in the NJ- series Controller configuration, including the CPU Unit and Configuration Units.
Section 4
Installation and Wiring This section describes where and how to install the CPU Unit and ConfigurationUnits and how to wire them.
Section 5
Troubleshooting This section describes the event codes, error confirmation methods, and corrections for errors that can occur.
Section 6
Inspection and Maintenance
This section describes the contents of periodic inspections, the service life of the Bat-
tery and Power Supply Units, and replacement methods for the Battery and Power
Supply Units.
Appendices The appendices provide the specifications of the Basic I/O Units, Unit dimensions, load short-circuit protection detection, line disconnection detection, and measures for
EMC Directives.
NJ-series CPU Unit Software User's Manual (Cat. No. W501)
Section Description
Section 1
Introduction This section provides an introduction to the NJ-series Controllers and their features, and gives the NJ-series Controller specifications.
Section 2
CPU Unit Operation
This section provides information that is necessary to use the CPU Unit, including
how the CPU Unit works and the operations that it performs depending on the status
of the CPU Unit.
Section 3
I/O Ports, Slave Configuration, and
Unit Configuration
This section describes how to use I/O ports, how to create the slave configuration
and unit configuration and how to assign functions.
Section 4
Controller Setup This section describes the initial settings of the function modules.
Section 5
Designing Tasks This section describes the task system and types of tasks.
Section 6
Programming This section describes programming, including the programming languages and the variables and instructions that are used in programming.
Section 7
Checking Operation and Actual
Operation
This section describes the items and procedures for checking the operation of an NJ-
series Controller, including offline debugging procedures.
Section 8
CPU Unit Functions This section describes the functionality provided by the CPU Unit.
Section 9
Communications Setup This section describes how to go online with the CPU Unit and how to connect to other devices.
Section 10
Example of Actual Application Pro-
cedures
This section describes the procedures that are used to actually operate an NJ-series
Controller.
Section 11
Troubleshooting This section describes the event codes, error confirmation methods, and corrections for errors that can occur.
Appendices The appendices provide the CPU Unit specifications, task execution times, specifica- tions of individual system-defined variables, data attribute lists, CJ-series Unit mem-
ory information, CJ-series Unit memory allocation methods, and version information.

Manual Configuration
4CJ-series Serial Communications Units Operation Manual for NJ-series CPU Unit(W494)
Sysmac Studio Version 1 Operation Manual (Cat. No. W504)
Section Description
Section 1
Introduction This section provides an overview and lists the specifications of the Sysmac Studio and describes its features and components.
Section 2
Installation and Uninstallation This section describes how to install and uninstall the Sysmac Studio.
Section 3
System Design This section describes the basic concepts for designing an NJ-series System with the Sysmac Studio and the basic operating procedures.
Section 4
Programming This section describes how to create programs with the Sysmac Studio.
Section 5
Online Connections to a Controller This section describes how to go online with a Controller.
Section 6
Debugging This section describes how to debug the programs online on the Controller or debug it offline with the Simulator.
Section 7
Other Functions This section describes other functions that are supported by the Sysmac Studio, including security functions and troubleshooting functions.
Section 8
Reusing Programming This section describes how to reuse the programs that you create with the Sysmac Studio.
Section 9
Support Software Provided with the
Sysmac Studio
This section describes the Support Software that is provided with the Sysmac Studio.
Section 10
Troubleshooting This section describes the error messages that are displayed when you check a pro- gram on the Sysmac Studio and how to correct those errors.
Appendices
The appendices describe the following:
Driver Installation for Direct USB Cable Connection
Specifying One of Multiple Ethernet Interface Cards
Online Help
Simulation Instructions
CJ-series Serial Communications Units Operation Manual for NJ-
series CPU Unit (Cat. No. W494) (this manual)
Section Description
Section 1
Introduction
This section provides an introduction to the Serial Communications Units and their
features. It also describes the operating procedure and the specifications of the
Serial Communications Units.
Section 2
Initial Settings and Allocations of
Device Variables for CJ-series Unit
This section describes the data exchange between the CPU Unit and Serial Commu-
nications Unit and the definitions of the device variables for CJ-series Unit.
Section 3
Installation and Wiring This section describes where and how to install the Serial Communications Unit, and how to connect and wire them.
Section 4
Using Protocol Macros This section describes the protocol macro function provided by the Serial Communi- cations Unit and the procedure for using the function.
Section 5
Serial Gateway This section describes the Serial Gateway function provided by the Serial Communi- cations Unit and the procedure for using the function.
Section 6
No-protocol Mode This section describes the No-protocol Mode function provided by the Serial Commu- nications Unit to send/receive data, and the procedure for using the function.
Section 7
Using Modbus-RTU Slave Mode
This section describes the Modbus-RTU Slave Mode function provided by the Serial
Communications Unit, the procedure for using the function and the details of the
command responses.
Section 8
Loopback Test This section describes the loopback test function provided by the Serial Communica- tions Unit and the procedure for using the function.
Section 9
Troubleshooting and Maintenance This section describes the troubleshooting procedure, event logs and maintenance procedure for the Serial Communications Unit.
Reference This section describes the details on the standard system protocols provided by the
CX-Protocol and the Serial Communications Unit.
Appendix ---

5
Manual Configuration
CJ-series Serial Communications Units Operation Manual for NJ-series CPU Unit(W494)
SYSMAC CS/CJ Series Serial Communications Boards Serial
Communications Units OPERATION MANUAL (Cat. No. W336)
Section Description
Section 1
Introduction This section introduces the features, specifications, and procedures of the Serial Communications Boards and the Serial Communications Units.
Section 2
Initial Settings and I/O Memory
Allocations
This section describes the data exchange between the CPU Unit and the Serial Com-
munications Boards/Serial Communications Units, and the I/O memory allocation.
Section 3
Installation and Wiring This section describes how to mounting the Serial Communications Board and Serial Communications Units, and how to connect the ports to external devices.
Section 4
Using Host Link Communications This section describes the procedure and other information required to use Host Link communications.
Section 5
Using Protocol Macros This section describes the procedure and other information required to use the proto- col macros.
Section 6
Serial Gateway This section describes the procedure and other information required to use the Serial Gateway.
Section 7
No-protocol Mode This section describes the procedure and other information required to use the no- protocol mode.
Section 8
Using 1:N NT Links This section describes the procedure and other information required to use the 1:N NT Links to Programmable Terminals
Section 9
Using Modbus-RTU Slave Mode This section describes the procedure and other information required to use the Modbus-RTU slave mode.
Section 10
Communications Performance This section describes the communications performance of the Serial Communica- tions Boards and the Serial Communications Units.
Section 11
Loopback Test This section describes the procedure and other information required to conduct loop- back test.
Section 12
Troubleshooting and Maintenance This section describes the troubleshooting and maintenance procedures for the Serial Communications Boards and the Serial Communications Unit.
Appendices ---
CX-Protocol Ver.1.9 OPERATION MANUAL (Cat. No. W344)
Section Description
Section 1
Introduction This section introduces the Protocol Macro function, the features and specifications of the CX-Protocol, and outline of the standard system protocol.
Section 2
Installing/Uninstalling/Starting/
Ending
This section outlines the functions of the CX-Protocol and describes installation pro-
cedure, startup/shutdown, and the user interface for the CX-Protocol.
Section 3
Protocol Macro This section describes details of the protocol macro functions.
Section 4
Using the Protocol Macro Function This section describes the communications sequence and settings for the protocol macro function.
Section 5
Object Creation This section describes how to create objects, such as projects, protocols, sequences, steps, messages, and matrices.
Section 6
Project and Protocol Editing This section describes details of the editing of projects and protocols.
Section 7
Sequence Setting and Editing This section describes details of the creating, setting and editing of sequences.
Section 8
Step Setting and Editing This section describes details of the creating, setting and editing of steps.
Section 9
Setting and Editing Messages and
Matrix Lists
This section describes details of the creating, setting and editing of messages and
matrix lists.
Section 10
Communications PLC Setup and
Online Connections
This section describes details of the communications settings and online connec-
tions.

Manual Configuration
6CJ-series Serial Communications Units Operation Manual for NJ-series CPU Unit(W494)
Section 11
Protocol Data Transferring and
Printing
This section describes details of the transferring, converting, and printing of protocol
data.
Section 12
Tracing and Monitoring This section describes details of PLC memory area monitoring and the transmission line tracing.
Section 13
Error and Error Log Display This section describes details of the displaying of errors and the error log. This func- tion cannot be used in NJ series.
Section 14
Troubleshooting This section lists the error messages and describes their causes and remedies.
Section 15
Help This section describes the online help services.
Appendices ---
CX-Integrator Ver.2. Operation Manual (Cat. No. W464)
Section Description
Section 1
Overview This section provides an overview of the CX-Integrator and describes the CX-Integra- tor menus and connecitions.
Section 2
Basic Operations This section describes the basic operations used for the CX-Integrator.
Section 3
Routing Tables This section describes how to set the routing tables. For NJ-series, routing table is created by using Sysmac Studio instead of CX-Integrator.
Section 4
Data Links for Controller Link and
SYSMAC LINK
This section describes how to set data links for Controller Link and SYSMAC LINK
networks.
Section 5
Ethernet This section describes the operations specific to Ethernet.
Section 6
DeviceNet This section describes the settings and operations unithe to DeviceNet networks including registeing slaves in the master, I/O allocations, and devide monitoring.
Section 7
CompoNet This section describes the basic usage of CompoNet networks and how to set Con- poNet parameters.
Section 8
CompoWay/F This section describes the settings and operations specific to the CompoWay/F sys- tem.
Section 9
NT Links This section describes the settings and operations specific to the NT Link system.
Section 10
Network Testing This section describes the operations of the network test tool.
Appendices This section describes the CPS files for Ethernet, Controller Link, CompoWay/F and
NT Link Networks, and EDS files for DeviceNet Networks.
Section Description

7
Manual Structure
CJ-series Serial Communications Units Operation Manual for NJ-series CPU Unit(W494)
Manual Structure
The following page structure is used in this manual.
Special information in this manual is classified as follows:
Page Structure
Special Information
Precautions for Safe Use
Precautions on what to do and what not to do to ensure safe usage of the product.
Precautions for Correct Use
Precautions on what to do and what not to do to ensure proper operation and performance.
Additional Information
Additional information to read as required.
This information is provided to increase understanding or make operation easier.
4-9
4 Installation and Wiring
NJ-series CPU Unit Hardware User’s Manual (W500)
stinUgnitnuoM3-4
4
stnenopmoCrellortnoCgnitcennoC1-3-4
4-3 Mounting Units
The Units that make up an NJ-series Controller can be connected simply by pressing the Units together
and locking the sliders by moving them toward the back of the Units. The End Cover is connectedin the
same way to the Unit on the far right side of the Controller.
1Join the Units so that the connectors fit exactly.
2The yellow sliders at the top and bottom of each Unit lock the Units together. Move the sliders
toward the back of the Units as shown below until they click into place.
Precautions for Correct UsePrecautions for Correct Use
The sliders on the tops and bottoms of the Power Supply Unit, CPU Unit, I/O Units, Special I/O
Units, and CPU Bus Units must becompletely locked (until they click into place) after connecting
the adjacent Unit connectors.
4-3-1 Connecting Controller Components
Connector
Hook Hook holes
Slider
Lock
Release
Move the sliders toward the back
until they lock into place.
Level 1 heading
Level 2 heading
Level 3 heading
Level 2 heading
A step in a procedure
Manual name
Special information
Level 3 heading
Page tab
Gives the current
headings.
Indicates a procedure.
Icons indicate
precautions, additional
information, or reference
information.
Gives the number
of the main section.
This illustration is provided only as a sample. It may not literally appear in this manual.

Manual Structure
8CJ-series Serial Communications Units Operation Manual for NJ-series CPU Unit(W494)
Note References are provided to more detailed or related information.
In this manual, "download" refers to transferring data from the Sysmac Studio to the physical Controller
and "upload" refers to transferring data from the physical Controller to the Sysmac Studio.
For the Sysmac Studio, synchronization is used to both upload and download data. Here, "synchronize"
means to automatically compare the data for the Sysmac Studio on the computer with the data in the
physical Controller and transfer the data in the direction that is specified by the user.
Version Information
Information on differences in specifications and functionality for CPU Units with different unit versions
and for different versions of the Sysmac Studio is given.
Precaution on Terminology

9
Sections in this Manual
CJ-series Serial Communications Units Operation Manual for NJ-series CPU Unit(W494)
Sections in this Manual
1R
2A
3I
4
5
6
7
8
9
1R
2A
3I
5
6
7
8
9
Introduction A Standard
System Protocol
Initial Settings and
Allocations of Device
Variable for CJ-series Unit
Appendices
Installation and
Wiring Index
Using Protocol
Macros
Serial Gateway
No-protocol Mode
Using Modbus-RTU Slave Mode
Loopback Test
Troubleshooting and Maintenance
4

10 CJ-series Serial Communications Units Operation Manual for NJ-series CPU Unit(W494)
CONTENTS
CONTENTS
Introduction ...............................................................................................................1
Relevant Manuals......................................................................................................2
Manual Configuration ...............................................................................................3
Manual Structure.......................................................................................................7
Sections in this Manual ............................................................................................9
CONTENTS...............................................................................................................10
Read and Understand this Manual ........................................................................15
Safety Precautions..................................................................................................18
Precautions for Safe Use........................................................................................23
Precautions for Correct Use...................................................................................29
Regulations and Standards....................................................................................32
Unit Versions ...........................................................................................................35
Related Manuals......................................................................................................37
Revision History......................................................................................................38
Section 1 Introduction
1-1 Using this Manual.................................................................................................................... 1-2
1-2 Overview...................................................................................................................................1-3
1-3 Protocol Overview................................................................................................................... 1-5
1-3-1 Protocol Macros..........................................................................................................................1-6
1-3-2 Loopback Test.............................................................................................................................1-6
1-3-3 Serial Gateway Mode..................................................................................................................1-6
1-3-4 No-protocol Mode........................................................................................................................1-7
1-3-5 Modbus-RTU Slave Mode...........................................................................................................1-7
1-4 Features....................................................................................................................................1-8
1-4-1 Serial Communications Units......................................................................................................1-8
1-4-2 Protocols.....................................................................................................................................1-8
1-5 System Configurations .........................................................................................................1-10
1-5-1 Protocol Macro, Serial Gateway, No-protocol, or Modbus-RTU Slave ......................................1-10
1-6 Specifications ........................................................................................................................ 1-14
1-6-1 Serial Communications Unit......................................................................................................1-14
1-6-2 General Specifications..............................................................................................................1-15
1-7 Selecting the Serial Communications Mode....................................................................... 1-22
1-8 Basic Operating Procedure ..................................................................................................1-23
1-8-1 Overview...................................................................................................................................1-23
1-8-2 Explanation of Procedure..........................................................................................................1-24

11
CJ-series Serial Communications Units Operation Manual for NJ-series CPU Unit(W494)
CONTENTS
Section 2 Initial Settings and Allocations of Device Variable for CJ-
series Unit
2-1 Component Names and Functions ........................................................................................ 2-2
2-2 Data Exchange with the CPU Unit.......................................................................................... 2-8
2-2-1 Data Flow.................................................................................................................................... 2-8
2-2-2 How to Specify and Create Variables....................................................................................... 2-12
2-3 Device Variable for CJ-series Unit ....................................................................................... 2-14
2-3-1 Allocations of Device Variable for CJ-series Unit...................................................................... 2-14
2-3-2 Device Variable for CJ-series Unit for System Settings............................................................ 2-14
2-3-3 Device Variable for CJ-series Unit for Software Switches......................................................... 2-23
2-3-4 Device Variable for CJ-series Unit for Status............................................................................ 2-24
2-4 System-defined Variable....................................................................................................... 2-34
Section 3 Installation and Wiring
3-1 Installing Serial Communications Units................................................................................ 3-2
3-1-1 System Configuration Precautions ............................................................................................. 3-2
3-1-2 Serial Communications Unit Installation Procedure.................................................................... 3-2
3-1-3 Unit Handling Precautions.......................................................................................................... 3-3
3-2 Wiring ....................................................................................................................................... 3-4
3-2-1 Wiring Precautions ..................................................................................................................... 3-4
3-2-2 Port Types................................................................................................................................... 3-4
3-2-3 Communications Modes and Ports.............................................................................................3-4
3-2-4 Connector Pin Layout................................................................................................................. 3-5
3-2-5 Mounting Height and Connector Cover Dimensions................................................................... 3-6
3-2-6 Reducing Electrical Noise for External Wiring............................................................................ 3-7
3-2-7 2-Wire and 4-Wire Connections.................................................................................................. 3-7
3-2-8 NT-AL001 Link Adapter Settings................................................................................................. 3-8
3-2-9 Connections for Protocol Macro, Serial Gateway, No-protocol Mode,
and Modbus-RTU Slave Mode.................................................................................................... 3-9
3-2-10 Connections in Loopback Test.................................................................................................. 3-18
3-3 RS-232C and RS-422A/485 Wiring ....................................................................................... 3-19
3-3-1 Recommended RS-232C Wiring Examples ............................................................................. 3-19
3-3-2 Recommended RS-422A/485 Wiring Examples....................................................................... 3-20
3-3-3 Wiring RS-232C Connectors on the CJ1W-SCU22/42............................................................. 3-22
3-3-4 Soldering .................................................................................................................................. 3-23
3-3-5 Assembling Connector Hood.................................................................................................... 3-24
3-3-6 Wiring RS-422A/485 Terminal-block Connectors on the CJ1W-SCU32/42.............................. 3-25
3-3-7 Connecting to Unit.................................................................................................................... 3-26
Section 4 Using Protocol Macros
4-1 Overview of the Protocol Macro Function............................................................................. 4-2
4-1-1 Protocol Macros.......................................................................................................................... 4-2
4-1-2 Using the Protocol Macros.......................................................................................................... 4-2
4-1-3 Protocol Structure....................................................................................................................... 4-4
4-1-4 Data Exchange Method for Link Words.................................................................................... 4-10
4-2 Device Variables for CJ-series Unit and System-defined Variables
(Protocol Macro Mode).......................................................................................................... 4-13
4-2-1 Device Variable for CJ-series Unit for System Settings............................................................ 4-13
4-2-2 Area Descriptions ..................................................................................................................... 4-15
4-2-3 System-defined Variable........................................................................................................... 4-21
4-2-4 Devices Variable for CJ-series Unit for Software Switches....................................................... 4-22
4-2-5 Device Variables for CJ-series Unit for Status.......................................................................... 4-24
4-2-6 Protocol Status ......................................................................................................................... 4-32

12 CJ-series Serial Communications Units Operation Manual for NJ-series CPU Unit(W494)
CONTENTS
4-3 Using Protocol Macros..........................................................................................................4-40
4-3-1 Executing Communications Sequences....................................................................................4-40
4-3-2 User Program Example.............................................................................................................4-42
Section 5 Serial Gateway
5-1 Serial Gateway Overview ........................................................................................................5-2
5-1-1 Overview.....................................................................................................................................5-2
5-1-2 Operating Conditions ..................................................................................................................5-2
5-1-3 Features......................................................................................................................................5-3
5-1-4 Serial Gateway Specifications.....................................................................................................5-4
5-2 Device Variables for CJ-series Unit and System-defined Variables
(During Serial Gateway Mode)................................................................................................ 5-5
5-2-1 Device Variables for CJ-series Unit for System Settings.............................................................5-5
5-2-2 System-defined Variable.............................................................................................................5-8
5-2-3 Device Variable for CJ-series Unit for Software Switches...........................................................5-9
5-2-4 Device Variable for CJ-series Unit for Status..............................................................................5-9
5-3 Using the Serial Gateway......................................................................................................5-12
5-3-1 Setting Device Variable for CJ-series Unit for System Settings and Software Switches...........5-12
5-3-2 Sending Messages Using the SendCmd Instruction.................................................................5-14
5-3-3 Using the Serial Gateway Function When Protocol Macros Are Executed...............................5-15
5-4 Protocol Conversion.............................................................................................................. 5-22
5-4-1 Types of Protocol Conversion....................................................................................................5-22
5-4-2 Converting to CompoWay/F......................................................................................................5-23
5-4-3 CompoWay/F Connection Examples ........................................................................................5-25
5-4-4 Converting to Modbus-RTU.......................................................................................................5-26
5-4-5 Converting to Modbus-ASCII ....................................................................................................5-28
5-5 Serial Gateway.......................................................................................................................5-29
5-5-1 Serial Gateway Execution Timing for Protocol Macros.............................................................5-29
5-5-2 Serial Gateway Timeout Monitoring..........................................................................................5-31
5-5-3 Other Functions.........................................................................................................................5-32
5-6 Communications Frames......................................................................................................5-33
5-6-1 CompoWay/F ............................................................................................................................5-33
5-6-2 Modbus-RTU.............................................................................................................................5-34
5-6-3 Modbus-ASCII...........................................................................................................................5-36
Section 6 No-protocol Mode
6-1 Overview...................................................................................................................................6-2
6-1-1 Definition.....................................................................................................................................6-2
6-1-2 Specifications..............................................................................................................................6-3
6-1-3 Connections for No-protocol Mode .............................................................................................6-4
6-2 Device Variables for CJ-series Unit and System-defined Variables
(No-protocol Mode)6-5
6-2-1 Device Variables for CJ-Series Unit for System Settings............................................................6-5
6-2-2 System-defined Variable.............................................................................................................6-8
6-2-3 Device Variable for CJ-series Unit for Software Switches...........................................................6-8
6-2-4 Device Variable for CJ-series Unit for Status..............................................................................6-8
6-2-5 Device Variable for CJ-series Unit for Status (When Sending/Receiving Data
with SerialSend, SerialRcv, or SerialRcvNoClear Instruction)..................................................6-11
6-3 Using Serial Port I/O Instructions ........................................................................................6-12
6-3-1 System Settings........................................................................................................................6-12
6-3-2 Instruction Execution Methods..................................................................................................6-12

13
CJ-series Serial Communications Units Operation Manual for NJ-series CPU Unit(W494)
CONTENTS
Section 7 Using Modbus-RTU Slave Mode
7-1 Modbus-RTU Slave System .................................................................................................... 7-2
7-1-1 Modbus-RTU Slave System........................................................................................................ 7-2
7-1-2 Modbus-RTU Specifications ....................................................................................................... 7-2
7-1-3 Communicating with NJ-series CPU Units Using Modbus ......................................................... 7-3
7-2 Device Variables for CJ-series Unit and System-defined Variables
(Modbus-RTU Slave Mode) ..................................................................................................... 7-5
7-2-1 Device Variable for CJ-series Unit for System Settings.............................................................. 7-5
7-2-2 System-defined Variable............................................................................................................. 7-8
7-2-3 Device Variable for CJ-series Unit for Software Switches........................................................... 7-8
7-2-4 Device Variable for CJ-series Unit.............................................................................................. 7-9
7-3 Command and Response Details......................................................................................... 7-13
7-3-1 Supported Modbus-RTU Commands ....................................................................................... 7-13
7-3-2 Command and Response Details............................................................................................. 7-14
Section 8 Loopback Test
8-1 Executing Loopback Tests .....................................................................................................8-2
8-1-1 Overview..................................................................................................................................... 8-2
8-1-2 Connection Method..................................................................................................................... 8-2
8-1-3 Procedure................................................................................................................................... 8-2
8-1-4 Indicators Used for the Loopback Test........................................................................................ 8-3
8-2 Device Variable for CJ-series Unit (Loopback Test)............................................................. 8-4
8-2-1 Device Variables for CJ-Series Unit for System Settings............................................................ 8-4
8-2-2 Device Variables for CJ-Series Unit for Status ........................................................................... 8-5
Section 9 Troubleshooting and Maintenance
9-1 Indicator Error Displays.......................................................................................................... 9-2
9-2 Communications Status Error Notification........................................................................... 9-3
9-2-1 Status Area Error Information..................................................................................................... 9-3
9-3 Troubleshooting....................................................................................................................... 9-4
9-3-1 Serial Gateway (Serial Gateway or Protocol Macro Mode)......................................................... 9-4
9-3-2 No-protocol Mode..................................................................................................................... 9-10
9-3-3 Protocol Macros........................................................................................................................ 9-16
9-3-4 Modbus-RTU Slave Mode......................................................................................................... 9-22
9-4 Error Logs .............................................................................................................................. 9-25
9-4-1 Error Log Data.......................................................................................................................... 9-25
9-4-2 Error Contents and Details ....................................................................................................... 9-26
9-4-3 Error Codes and Troubleshooting............................................................................................. 9-28
9-5 Event Logs ............................................................................................................................. 9-30
9-5-1 Overview of the Event Logs...................................................................................................... 9-30
9-5-2 Error Table................................................................................................................................ 9-30
9-5-3 Error Descriptions..................................................................................................................... 9-36
9-6 Cleaning and Inspection....................................................................................................... 9-53
9-6-1 Cleaning.................................................................................................................................... 9-53
9-6-2 Inspection ................................................................................................................................. 9-53
9-7 Replacement Precautions..................................................................................................... 9-55
9-7-1 Precautions when Replacing Unit............................................................................................. 9-55
9-7-2 Settings after Replacing Unit.................................................................................................... 9-55
9-7-3 Replacing the Unit .................................................................................................................... 9-56

14 CJ-series Serial Communications Units Operation Manual for NJ-series CPU Unit(W494)
CONTENTS
A Standard System Protocol
R-1 Reading Reference Documents..............................................................................................R-3
R-1-1 Using Standard System Protocols ............................................................................................. R-3
R-1-2 Standard System Protocols........................................................................................................ R-6
R-2 CompoWay/F Master Protocol................................................................................................R-7
R-2-1 CompoWay/F ............................................................................................................................. R-7
R-2-2 Communications Specifications................................................................................................. R-8
R-2-3 Transmission Procedure............................................................................................................. R-8
R-2-4 Command and Response Formats............................................................................................ R-8
R-2-5 CompoWay/F Master Protocol Sequences.............................................................................. R-12
R-2-6 CompoWay/F Message Frames and PMCR(260) Operands................................................... R-12
R-2-7 Send/Receive with ASCII Conversion and with Response ...................................................... R-13
R-2-8 Structure of the Protocol .......................................................................................................... R-13
R-2-9 Connections............................................................................................................................. R-38
R-3 Mitsubishi Computer Link Master
(A-compatible 1C Frame, Model 1)R-41
R-3-1 Communications Specifications............................................................................................... R-41
R-3-2 Command/Response Formats................................................................................................. R-42
R-3-3 Command Frame Contents...................................................................................................... R-43
R-3-4 Mitsubishi Computer Link Master Protocol Sequences............................................................ R-43
R-3-5 Structure of the Protocol .......................................................................................................... R-43
R-4 V500/V520 Bar Code Reader Protocol.................................................................................R-65
R-4-1 Connections............................................................................................................................. R-65
R-4-2 System Setting......................................................................................................................... R-66
R-4-3 Protocol Configuration.............................................................................................................. R-67
R-5 3Z4L Laser Micrometer Protocol..........................................................................................R-78
R-5-1 Connections............................................................................................................................. R-78
R-5-2 List of Operations with Laser Micrometer (5000/6000 Series)................................................. R-81
R-5-3 Protocol Configuration.............................................................................................................. R-83
R-6 Hayes Modem AT Command Protocol...............................................................................R-117
R-6-1 Protocol Configuration............................................................................................................ R-117
R-6-2 Connections........................................................................................................................... R-119
R-6-3 Compatible Modems.............................................................................................................. R-119
R-6-4 Modem Settings..................................................................................................................... R-120
R-6-5 Communication Errors ........................................................................................................... R-125
Appendices
A-1 Differences in Available Functions Depending on the CPU Unit (NJ or CJ Series) ..........A-2
A-1-1 Functional Differences ................................................................................................................A-2
A-1-2 Differences in Methods for Access from a User Program...........................................................A-3
A-2 Version Information...............................................................................................................A-12
Index

15
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CJ-series Serial Communications Units Operation Manual for NJ-series CPU Unit(W494)
Read and Understand this Manual
Please read and understand this manual before using the products. Please consult your OMRON
representative if you have any questions or comments.
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.

Read and Understand this Manual
16 CJ-series Serial Communications Units Operation Manual for NJ-series CPU Unit(W494)
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.

17
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CJ-series Serial Communications Units Operation Manual for NJ-series CPU Unit(W494)
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.

Safety Precautions
18 CJ-series Serial Communications Units Operation Manual for NJ-series CPU Unit(W494)
Safety Precautions
The following notation is used in this manual to provide precautions required to ensure safe usage of a
CJ-series Serial Communications Unit. The safety precautions that are provided are extremely impor-
tant to safety. Always read and heed the information provided in all safety precautions.
The following notation is used.
Definition of Precautionary Information
WARNING Indicates a potentially hazardous situation which, if not avoided,
could result in death or serious injury. Additionally, there may be
severe property damage.
Caution Indicates a potentially hazardous situation which, if not avoided,
may result in minor or moderate injury, or property damage.
Precautions for Safe Use
Indicates precautions on what to do and what not to do to ensure safe usage of the product.
Precautions for Correct Use
Indicates precautions on what to do and what not to do to ensure proper operation and performance.