Omron CS/CJ Serial Port Connection Guide

Help Contents

Introduction

The Omron CS and CJ range of PLCs support these types of serial port interface:

Model NameDescription
CJ1Modular PLC with integrated RS-232 serial port
CS1Rack based PLC with integrated RS-232 serial port
CP1W-CIF01RS-232 serial interface compatible with selected CJ2M PLCs
CP1W-CIF11RS-422/485 serial interface compatible with selected CJ2M PLCs
CJ1W-SCU21-V1Dual RS-232 serial port module for CJ modular PLCs
CJ1W-SCU31-V1Dual RS-422/485 serial port module for CJ modular PLCs
CJ1W-SCU41-V1One RS-232 and one RS-422/485 serial port module for CJ modular PLCs
CS1W-SCB21-V1Dual RS-232 serial port communication board for CS CPU units
CS1W-SCB41-V1One RS-232 and one RS-422/485 serial port communication board for CS CPU units
CS1W-SCU21-V1Dual RS-232 serial port module for CS rack mounted PLCs
CS1W-SCU41-V1One RS-232 and one RS-422/485 serial port module for CS rack mounted PLCs
CS1W-CN118Adapter cable converting the peripheral port into an RS-232 port

The rest of this article uses the name CS/CJ Serial Port to refer to any of the above serial port interface.

All of the above CS/CJ Serial Port offer three types of connection:

Connection TypeDescription
RS-232 DE-9RS-232 using a D-Subminiature 9 pin female connector
RS-422/485 DE-9RS-422/485 using a D-Subminiature 9 pin female connector
RS-422/485 Terminal BlockRs-422/485 using a terminal block connector

Connection Cables

RS-232 Connection

The RS-232 DE-9 port can connect directly to a serial port on a Personal Computer (PC). The serial port on a PC is usually a 9 pin D-subminiature connector. These cables are suitable to connect the PLC to a computer with a 9 pin D-subminiature connector:

As an alternative you can create your own cable using this wiring:

CS/CJ RS-232
D-Subminiature connector DE-9 plug wiring side shown
PC
D-Subminiature connector DE-9 socket wiring side shown
SD22RXD
RD33TXD
RS48CTS
CS57RTS
DR + ER7 + 8
SG95GND
4 + 6DTR + DSR

Note: All other pins not shown in the above diagram have no connection.

RS-422 Connections

For information about connecting a PLC Device to a computer using an RS-422 link, see RS-422 Communication with PLC Devices.

RS-422 connection for modules with a DE-9 connector:

CS/CJ RS-422
D-Subminiature connector DE-9 plug wiring side shown
SDA (Tx-)1
SDB (Tx+)2
RDA (Rx-)6
RDB (Rx+)8

Use this table to select the correct wiring between the Omron DE-9 connector and common RS-422 adapters:

Omron CS/CJ DE-9
SCB41-V1 Port 2
SCU31-V1 Port 1
SCU31-V1 Port 2
SCU41-V1 Port 1
1 (SDA) 2 (SDB) 6 (RDA) 8 (RDB)
Advantech
ADAM-4520
RX- RX+ TX- TX+
StarTech
IC485S
IC485SGB
IC485SEU
3 (RX+) 4 (RX-) 2 (TX+) 1 (TX-)

RS-422 connection for modules with screw terminals:

Omron CS/CJ Terminals
SCU32 Port 1
SCU32 Port 2
SCU42 Port 1
1 (RDA) 2 (RDB) 3 (SDA) 4 (SDB)
Advantech
ADAM-4520
TX- TX+ RX- RX+
StarTech
IC485S
IC485SGB
IC485SEU
2 (TX+) 1 (TX-) 3 (RX+) 4 (RX-)

RS-485 Connections

For information about connecting a PLC Device to a computer using an RS-485 link, see RS-485 Communication with PLC Devices.

RS-485 connection for modules with a DE-9 connector:

CS/CJ RS-485
D-Subminiature connector DE-9 plug wiring side shown
Data-1
Data+2

RS-485 connection for modules with screw terminals:

RS-485 SignalScrew Terminal
Data- 1
Data+ 2

Configuring Serial Communications

Setting up a serial communication link can be difficult because of the wide variety of communication options. For example:

For Fernhill SCADA to successfully communicate with an CS/CJ Serial Port both need to use the same communication options. There are a two main ways to achieve this:

Manual Configuration

The CS/CJ Serial Port can be configured using CX-Programmer.

Fernhill SCADA configuration parameters that affect serial communications include:

ParameterDescription
Omron Serial Port ModeDefines the baud rate and character frame format.
Omron Host Link PLC Tag UnitNumberDefines the host link unit number.
Omron FINS PLC Tag CModeUnitDefines the host link unit number.
Omron FINS PLC Tag UnitNumberDefines the FINS unit number.

Configuring CS/CJ Serial Ports using CX-Programmer

You can use CX-Programmer to configure a CS/CJ Serial Port. The exact method depends on whether the port is on the CPU unit, or on a plug in board or module.

Configuring Serial Ports on the CPU unit

To change the settings of a serial port on the CPU unit:

1. Open a project in CX-Programmer and in the Workspace window select Settings:

Workspace window with settings highlighted

2. Double click the Settings branch to open the PLC Settings window. Select the Host Link tab:

Host link serial port settings

Note: The Mode parameter must be set to Host Link Configure the other settings as required.

Configuring Serial Ports on a Plug in Board or Extension Module

1. Open a project in CX-Programmer and in the Workspace window select IO Table and Unit Setup:

Workspace window with I/O table highlighted

2. Double click the IO Table and Unit Setup branch to open the PLC IO Table window. Expand the branches and select the Board or Module you want to change:

I/O table

Note: This example shows a CJ1W-SCU21-V1 communication module selected.

3. Double click the selected module to open the settings for the module:

Board or module parameters

Note: Make appropriate changes and Click OK.

For more information refer to these Omron Reference Manuals:

Further Information

Omron serial channel

For information about Omron serial channel configuration.

Omron host link PLC

For information about Omron Host Link PLC Tag configuration.

Serial Communications

For background information on serial communications.

Omron Driver

For information about the Omron Driver.

Glossary

For the meaning of terms used in Fernhill SCADA.