156 - Troubleshooting and Technical Support DeviceMaster Installation and Configuration Guide: 2000594 Rev. F
Troubleshooting and Technical Support
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 154, Steps 1
through 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. In PortVision DX, click Tools >Applications >Test Terminal (WCom2) to start Test Terminal.
2. Open two ports RS-485 ports. This example uses COM40 and COM41.
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