Digital keypad that allows the door to be opened by entering a 4- to 6-digit code previously programmed in the central controller, necessary for its operation. For centralized access control installations, where a PC code change or event registration is required, to complement the electronic door entry system and allow neighbors access to the building, for example: offices, offices, garages. Requires an external centralized controller such as ACMAX, AC-PLUS or IP_AXES. Wiegand 4 or 8 bit keypad protocol. IPK 5409. 12VDC supply.