120 - Troubleshooting and Technical Support
DeviceMaster LT User Guide: 2000586 Rev. B
Loopback Test (RS-232)
You should see the
alphabet scrolling across
the port. If so, then the port
installed properly and is
operational.
Note: If you left Port
Monitor running, it
should show data
sent and received
and show the
average data
throughput on the
port.
4. Select Port > Send and
Receive Test Data to stop the
scrolling data.
5. You can go to th
e next
p
rocedure to run the Loopback Test on Page 120 if this is an RS-232 port.
If this test successfully completed, then the port is operational as expected.
Note: Do NOT forget to restart the communications application.
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 119, 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.
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