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Isolating Problems Using Loopback Data Tests
D-14 Issue 2 November 1996
You should now disconnect the terminal from the 8400B Plus Data Module. The
8400B Plus Data Module will retain the option settings during power removal.
A loopback plug must now be connected to the EIA Connector Interface of the
8400B Plus Data Module. A loopback plug connects pin number 2 to pin
number 3 on the 8400B Plus Data Module’s EIA Interface using a modified 9-pin
connector. The modified connector is shown in Figure D-9.
Figure D-9. 9-Pin Connector Wired as a Loopback Plug
Using the Loop-Around Data Test
Arrangement
The user calls the Loop-Around Data Test Arrangement from a terminal/PC.
Once connected, the user checks to see if characters entered from the
keyboard are successfully echoed back. If the terminal/PC is set for full duplex
and the user types in
The cat
then
The cat
is echoed back in a successful test.