Comtrol WCom2 - Manual (Page 26)

26 - Using Test Terminal Port Monitor and Test Terminal User Guide: 2000485 Rev. B
Loopback Test (RS-232)
Loopback Test (RS-232)
The Loopback Test tests the modem control (hardware handshaking) signals. It
only has meaning in RS-232 mode on serial connector interfaces with full RS-232
signals. If performed under the following conditions, the test will always fail
because full modem control signals are not present:
• RS-422
• RS-485
• RJ11 connectors
Use the following steps to run the Loopback Test.
1. If necessary, start Test Terminal (Page 24, Steps 1 and 2 ).
2. Click Port > Loopback Test.
This is a pass fail test and will take a second or two to complete. Repeat for
each port that needs testing.
If the Loopback Test and the Send and Receive Test Data tests successfully
complete, then the port is operational as expected.
Sending and Receiving Data (RS-485: 2-Wire)
This procedure shows how to use Test Terminal (WCom2) to test two RS-485 (2-
wire, half-duplex) ports.
1. Start Test Terminal.
2. Open two ports RS-485 ports. This example uses COM40 and COM41.