More Information:
1 to 3 per system. Requires open card slot.1 per DK24/56/96 or DK40 system to interface to SMDR, local terminal or external modem. Also contains relay control, alarm sensor, door lock control, BGM mute control, tape recorder control or night ring relay, and 600 ohm paging interface.
Mfr. Part #: PIOUS2, PIOUS2A