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Appendix B: Trouble Shooting
PROBLEM
No communication with the central station computer on COM1.
SOLUTION
Ensure that the cable connected to COM1 is an RS-232 cable; it should not be a null-modem type.
Check the baud rate for COM1 (CPM2 option 05).
Check the computer software setup.
PROBLEM
Bad communication with central station computer.
SOLUTION
The central station software is too sow to provide the acknowledgement signal for the CPM2. Contact
the software manufacturer for a software upgrade.
Increase the acknowledge wait time with CPM2 Configuration Option 07.
Check COM1 baud rate and communication format using CPM2 Configuration Options 05, 06.
Ensure that the COM1 connection is secure.
PROBLEM
Data is not being received by the DVL2A.
SOLUTION
Ensure that the DML2A to RS-232 connections are correct.
Ensure that all 6 resistors are present on the DML2A backplane.
Ensure that Jumpers J1, J2, J3, J4 are removed on the DML2A backplane.
Ensure that the data being transmitted to the DVL2A is 4800 baud.
PROBLEM
The Carrier lost LED is always on.
SOLUTION
Ensure that the DSR line of the RS-232 connection is correct to the backplane.
PROBLEM
CPM2 displays the COM1 debugging mode and the Master Code is not valid.
SOLUTION
The CPM2 needs to be re-booted. Refer to the Cold Boot section of this manual.
PROBLEM
The Line card displays “<<CPM ERROR>>” and/or alarms are not transmitted to the computer and
printer.
SOLUTION
Ensure that the Line Card number is not out of the range of the CPM2 scanning.
Ensure that the flat cables connected between the DML4 and the Line Cards are connected correctly;
ensure that the contact between the connectors is secure.
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