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CHPA S
ERIES
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.
B.16.1 Flash RAM - Operation and Programming
A Flash RAM is a memory device with the two best characteristics of a disk drive - non-volatile
memory and read/write capability. In the CHPA, a Flash RAM contains the M&C system's
program contents. Software upgrades are easy to install in a Flash RAM based CHPA because
the upgrade consists of connecting a PC to the CHPA, then executing a PC program. In about
two and half minutes the transfer is complete without the hassle of removing the CHPA's cover.
To enhance the reliability of this approach, a backup version of the CHPA's software exists in
an EPROM. This version is not updated (nor can it be via the auxiliary serial port) when the
Flash RAM contents are updated. If the Flash RAM contents are corrupted, the CHPA can use
the EPROM based program. Also, when the CHPA is powered up, the user may force the
CHPA to use the EPROM based program. To determine which program version is in use, look
at the Software Version menu item. If the letter F follows the software version number, the
CHPA is using the Flash RAM's program. If the letter R follows the software version number,
the CHPA is using the EPROM's program.
B.16.2 To Force the CHPA to Use EPROM Contents
To force the CHPA to use the EPROM's program, start with the CHPA turned off. On the front
panel, simultaneously hold down the 1, 2, and 3 keys. Turn the CHPA on, wait about one
second, then release the keys. To determine which program version is in use, look at the
Software Version menu item. If the letter F follows the software version number, the CHPA is
using the Flash RAM's program. If the letter R follows the software version number, the CHPA
is using the EPROM's program.
B-26
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