You seem unclear as to your system model.
Dsc alarm memory light on.
A dsc alarm system should run off of battery power for several hours during a power outage but if you have a longer period of downtime the batteries can be drained.
This is a short video on how to view and clear alarm memory with a dsc power series alarm system.
Alarm memory display if the memory light is on an alarm has occurred during the last time armed period.
Press the then 3 keys to display the zone which caused the alarm.
Press the key to return to ready.
Dsc alarms can go off for a number of reasons.
To reset the alarm or the warning lights enter your master code twice press the reset button and then enter 72 if the alarm is still ringing.
The alarm memory will automatically he displayed when the system is disarmed see disarming the system.
Open the alarm cabinet where the backup battery resides.
Press to exit.
When that happens you will need to reset the sensors using the keypad on the control unit.
To clear the memory arm and disarm the system.
Alarm memory when an alarm occurs the memory indicator and fire indicator if applicable will turn on.
The corresponding sensor number will flash.
Dsc commands vary a bit from model to model.
Normally there is a wiring diagram with the proper model number on it.