Honeywell Expansion Input/Output Board Model : CP-EXPIO Outputs :- 6 AO ( 0-10 Vdc), 4 DO (Traic outputs) Power :- 24 VAC, ± 20%. @ 50/60 Hz with surge protection Communication :- RS 485: Expansion IO Inputs :- 8 Universal 15 VA with power LED Indication 50/60Hz,IP20, CLASS 2