you should have a bypass circuit input on the card reader add a set of n/o contacts to your fire service phase 2 keyswitch. put these to your bypass(disable) card reader in put. these should be n/o so that when you turn the key to phase 2 the switch closes and puts the card reader on by pass. which disables the card reader. you will have to buy a new set of keyswitch contacts from a vendor usually.
