Emerson ControlWave Instruction Manual page 126

ControlWave I/O Expansion Rack Instruction Manual
Test Procedure
5-30
Use this procedure to test the comm ports.
Connect an external loop-back plug to the port on the CPU or
1.
SCB port you want to test. Valid ports are:

J2 of CPU board for COM1

J3 of CPU board for COM2

J2 of SCB board for COM3

J3 of SCB board for COM4
Select Communications on the WINDIAG Main Diagnostics
2.
Menu. The Communications Diagnostic screen opens:
Figure 5-24. Communications Diagnostic Menu
Enter 5 in the Number of Passes field.
3.
Select a port to test (click  to display all available ports).
4.
: The port you select must correlate to the port on which you
Note
placed the loop-back plug in step 1.
Select 115200 or ALL ASYNC as the baud rate (click  to
5.
display all available rates).
Click RUN to start the test. At the completion of the test (which
6.
generally takes about 5 seconds), any failed results appear in the
Status field to the right of the RUN button:

TXD RXD Failure

CTS RTS Failure
Click Return to Menu to display the WINDIAG Main Menu.
7.
Service & Troubleshooting Revised Aug-2015