The CX-12 Performs two functions:

Switching Network           
(De) energize electric locks (including magnetic locks or electric strikes) and activate automatic door operator with adjustable time delays. Extend trigger to maintain signal to door operators in EVAC door applications. Simplify wiring in telephone entry applications by eliminating the need for an isolating relay (to switch)

Bi-Directional Door Sequencer
Sequence two automatic doors in both directions. A typical application is controlling two vestibule doors, with sequential (time delayed) opening upon activation of both an exterior and interior door control switch.