Emerson ControlWave EFM 3808 Instruction Manual page 75

Test Procedure
Revised Mar-2011
ControlWave Express Instruction Manual (CI-ControlWave Express)
You can configure RS-485 loopback by setting CPU/System
Note:
Controller board switches SW3-1 & SW3-2 ON.
 Port 3 - RS-485 use loop-back wires or CPU Switch SW3 (see
Figure 5-11).
These tests verify the correct operation of the communication ports.
: You cannot test a communications port while you are using it.
Note
You can only test currently unused ports. After you complete
testing on all other communication ports (and verify their correct
functioning), you must reconnect (using a now validated port)
and test the remaining untested port.
Use this procedure to test the communication ports.
Connect an external loop-back plug to the port on the CPU you
1.
want to test. Valid ports are:
Select Communications on the WINDIAG Main Diagnostics
2.
Menu. The Communications Diagnostic screen opens:
Figure 5-12. Communications Diagnostic Menu
Enter 5 in the Number of Passes field.
3.
Select a port to test (click  to display all available ports).
4.
Service & Troubleshooting 5-15