RS-232 Main Port Test
In order to perform the RS-232 port testing, you will need to have or make two test connectors with pins 4 and 5
connected as follows:
Figure 3-1. Test Connector for RS-232 Ports
1. Press the
+
(plus) key. The display shows
SIO LOOP BACK TEST
.
2. Plug the test connector into the RS-232 port in the main interface board (the lower RS-232 port, next to
the IBM keyboard port.
Figure 3-2. DC-200/300 Interface Ports
If the port tests correctly, the following message is displayed.
If the loop back test of the port fails, you will see the following:
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