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B.15 POST Faults
Possible POT faults are described in Table B-14.
Table B-13. POST Faults
Test #
POST Fault Name
1
A/D Calibration: The A/D converter has not responded to a command within a specified time
limit during calibration, or the accuracy of the A/D converter is not within 10 bits of Vref+.
2
A/D Initialization: The A/D converter has not responded to a command within a specified time
limit during initialization.
3
BBRAM Memory: The contents of the RTC BBRAM is read, written, then read back. This error
occurs if the checksum for the data read back is bad.
4
EPROM Memory: The EPROM modulo 256 memory check has failed. The memory is tested by
summing up all bytes in the EPROM.
5
RTC Not Running: When the unit is first turned on the RTC is read. The RTC is read again
>1.5 seconds later. This error occurs if the RTC seconds have not changed after 1.5 seconds.
6
RTC Stuck in Update: A flag within the RTC indicates if it's in the process of updating the
current time. This error occurs if the flag doesn't clear within a specified time limit.
7
Static RAM Memory: This error occurs if this static RAM test fails. The memory is tested by
shifting a bit through all eight of each byte.
8
RAM size Error: If SRAM (U2) on controller is smaller than 128Kx8, this error will appear.
B.16 Software Error Codes
These errors should never appear—if you see a Software Error Code, contact CPI Service and
report the code along with the operating condition of the unit when the error was observed.
Table B-14. Software Error Codes
Error Code
Description
50
Bad Sequence Counter: Each state of the CHPA is broken up into sequences. This
error occurs if an illegal sequence occurs within a state.
51
BBRAM Too Small: The number of variables allocated to the RTC BBRAM is greater
than the BBRAM can hold.
52
Invalid Panel Type: This error occurs if an invalid panel is selected. Currently, there is
only one local and one remote panel.
53
Invalid State: This error occurs if the CHPA is put in an illegal state.
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CHPA SERIES
B-29
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