Microlok II System Startup, Troubleshooting, and Maintenance UNION SWITCH & SIGNAL
SM-6800C Rev. 2.5 September 2000 7-7
"RCV." Messages containing errors are identified and any good message bytes received are
displayed.
The protocol monitor display essentially operates in real-time for communication rates up to
2400 bps. At higher communication rates data may be lost, although messages sequence is
preserved. Use of the serial link protocol monitor does not affect the operation of the Microlok II
unit in any way.
To troubleshoot communication problems using the serial link protocol monitor, you must
possess intimate knowledge of the protocol being monitored. Refer to a protocol description
appropriate for the protocol being monitored.
7.4 RESTORING THE SYSTEM TO NORMAL OPERATION
After the cause of the malfunction has been isolated to either the application software or a single
line replaceable hardware item, the next step is to make corrective repairs and restore the system
to normal operation.
If the malfunction has been traced to a hardware component, replace the component or make the
necessary repairs. Then check the configuration of the affected portion of the system per chapter
6 and retest the affected system functions to verify proper operation.
If the malfunction was associated with a coded track circuit board or any other equipment item
related to the coded track circuit function of Microlok II, make certain to perform the track circuit
checks and adjustments specified in section 6.2.10.
If the malfunction appears to be related to the application program, review the program listing
carefully, make any necessary corrections, recompile the program, and then reload the program
per chapter 5 of this manual. Service manual SM-6800D covers the application programming of
the Microlok II system. After the application software has been reloaded, check the configuration
of the affected portion of the system per chapter 6 of this manual. Then retest the affected system
functions to verify proper operation.
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