Executing Loopback Tests - Omron SYSMAC CS1W-SCB41-V1 Operation Manual

Executing Loopback Tests

10-1 Executing Loopback Tests
10-1-1 Overview
10-1-2 Connection Method
RS-232C Port
RS-422A/485 Port
10-1-3 Procedure
1,2,3...
304
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.
Loopback test
Make the connections according to the type of port, as shown in the following
diagrams.
The loopback test is performed using the procedure shown below.
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
Serial Communications Unit
(CS/CJ Series)
Loopback test switch
Signal
Pin
2 SD
3 RD
4 RTS
5
CTS
1 FG
8 DTR
7 DSR
Signal
Pin
1 SDA
2 SDB
6 RDA
8 RDB
Section 10-1