One door normally locked and One door normally unlocked.

Open door 1 with Key, Keypad, Fab, etc door 2 remains locked until door 1 is closed and locked. Open door 2 with Push switch, door 1 cannot open until door 2 is closed and locked.

Emergency push switch unlocks both doors.

902C power supply includes a fire panel emergency switch interface module (ERI). No need for additional specification.