MDE-2597L Gilbarco® Security Module (GSM) PA0258XXXXXXX Installation and Service Instructions · January 2010
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System Operation
Status LED
When a new GSM is initially powered up, the status LED should flash in one of the following
patterns.
For Master/Session Key
LED Pattern
Indication
Continuous ON/OFF Flash (see
GSM good - Ready for debit
Diagnostic Code 3 (refer to
on
GSM good - Indicates that the network working key has been
successfully loaded from the network
Any other error code pattern
Replace GSM
Once the GSM has received a network working key (Master/Session only), the status LED will
blink ON and OFF continuously, approximately once per second, as shown in
GSM is ready for debit.
For DUKPT
LED Pattern
Indication
Continuous ON/OFF Flash (see
GSM good - Ready for debit
Any other error code pattern
Replace GSM
A DUKPT injected GSM will blink ON and OFF continuously right out of the box (network
working key is not required).
Figure 7: LED Status
ON
OFF
Approximately 1 blink per second
Example: Graph Indicating Normal LED Display
Example: Graph Indicating diagnostic Code 3
ON
OFF
On for 5
seconds
3 Blinks
On for 5
seconds
GSM related errors are signaled by diagnostic code displays on the status LED. The status
LED will stay lit for approximately five seconds between the display of diagnostic code. This
sequence repeats continuously. Refer to
