Omron SYSMAC CJ1W-SCU21-V1 User Manual

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Executing Loopback Tests Section 10-1
10-1 Executing Loopback Tests
10-1-1 Overview
Executing a loopback test will allow you to test a port communications circuit
by connecting a loopback-wire connector to the port of a Serial Communica-
tions Board or Unit, looping back the transmitted data to make it the received
data for the Unit or Board, and then comparing and checking the data.
10-1-2 Connection Method
Make the connections according to the type of port, as shown in the following
diagrams.
RS-232C Port
RS-422A/485 Port
10-1-3 Procedure
The loopback test is performed using the procedure shown below.
1,2,3... 1. Connect the connector of the port to be used to execute the loopback test.
See
10-1-2 Connection Method for details.
2. Set the serial communications mode in the Setup Area to Loopback Test
(F Hex). Refer to
10-2 Setup Area Allocations.
3. Set the following communications settings for the loopback test in the Set-
up Area: Baud rate, stop bits, parity, and data length. Refer to
10-2 Setup
Area Allocations
.
4. Cycle the power, restart the Unit or Board, or restart the port.
Use the following bits to restart the Board or Unit.
Board: A60800
Units: A501, bits 00 to 15 (bits correspond to unit numbers 0 to F)
Use the following bits to restart the port.
Board: A636, bit 01 for port 1 and bit 02 for port 2
Units: A620 + unit number, bit 01 for port 1 and bit 02 for port 2
Loopback test
Loopback test switch
Serial Communications Unit
(CS/CJ Series)
Pin
Signal
2
3
4
5
1
8
7
SD
RD
RTS
CTS
FG
DTR
DSR
Pin
Signal
1
2
6
8
SDA
SDB
RDA
RDB

Omron SYSMAC CJ1W-SCU21-V1 Specifications

General

Model	CJ1W-SCU21-V1
Type	Serial Communications Unit
Number of Ports	1
Parity Check	None, Even, Odd
Manufacturer	Omron
Operating Temperature	0 to 55 °C
Storage Temperature	-25 to 65 °C
Data Bits	7, 8
Stop Bits	1 or 2 bits
Flow Control	RTS/CTS
Isolation	Photocoupler isolation
Applicable PLC	CJ1 Series
Power Supply	5 VDC (supplied from the PLC backplane)
Compatible PLC Series	CJ1 Series
Protocol Support	NT Link, Host Link, No-protocol Mode
Baud Rate	300 to 115200 bps

Summary

Intended Audience

General Precautions

Safety Precautions

Operating Environment Precautions

Application Precautions

Conformance to EC Directives

6-1 Applicable Directives

Lists the relevant EC Directives, specifically EMC Directives and Low Voltage Directive.

6-2 Concepts

Defines the concepts related to EMC Directives, emphasizing OMRON devices' conformity to standards.

Unit Versions of CS/CJ-series Serial Communications Boards/Units

Unit Versions

Introduces the concept of unit versions for managing CS/CJ-series Serial Communications Units/Boards.

1. Unit Version Notation on Products

Describes how unit version codes are provided on product nameplates for CS-series Serial Communications Boards and Units.

Functions Added in the Unit Version 1.3 Upgrade

Functions Added in the Unit Version 1.2 Upgrade

SECTION 1 Introduction

1-1 Using this Manual

Explains how to use the manual for Host Link, protocol macro, and 1:N NT link communications.

1-2 Overview

Provides an overview of the Serial Communications Boards and the Serial Communications Unit.

1-3 Protocol Overview

Details the various serial communications modes supported by Serial Communications Boards and Units.

1-4 Features

Describes the features of the Serial Communications Boards, the Serial Communications Unit, and the protocols.

1-5 System Configurations

Explains the system configuration supported by each serial communications mode.

1-6 Specifications

Provides detailed specifications for Serial Communications Boards and Units, including ports, protocols, and data exchange.

1-7 Comparison to Previous Products

Compares CS/CJ-series Serial Communications Boards/Units with C200HX/HG/HE Communications Boards and Host Link Units.

1-8 Selecting the Serial Communications Mode

Guides the user in selecting the appropriate serial communications mode based on the connected device.

1-9 Basic Operating Procedure

Provides an overview of the basic operating procedures for installing and configuring the units.