Emerson Process Management Bristol ControlWave ExpressPAC - Manual (Page 82)

ControlWave ExpressPAC Instruction Manual (CI-ControlWave EPAC)
 Port 2 - RS-232 use loop-back wires (see Figure 5-7).
 Port 3 - RS-232 use loop-back wires (see Figure 5-8).
Figure 5-8. COM3 RS-232 & RS-485 Loop-back Wires
Note:
You can configure RS-485 loopback by setting CPU/System
Controller board switches SW3-1 & SW3-2 ON.
 Port 3 - RS-485 use loop-back wires or CPU Switch SW3 (see
Figure 5-8).
These tests verify the correct operation of the communication ports.
5-14 Service & Troubleshooting Revised Mar-2011
Note
: You cannot test a communications port while you are using it.
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.
Test Procedure
Use this procedure to test the communication ports.
1.
Connect an external loop-back plug to the port on the CPU you
want to test. Valid ports are:
2.
Select Communications on the WINDIAG Main Diagnostics
Menu. The Communications Diagnostic screen opens: