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Unable to unarm alarm after changing battery ?

I have a DSC alarm keypad. It is a PC1555RKZ keypad. I never received the code and changed out the battery. Once installed and the transformer plugged, the keypad shows the Armed and system lights on. I can't unarm it since I don't have the code. Does anyone know the master code so that I can unarm and enter my new code?
Frank, January 2010