INPUT/OUTPUT UNIT; PART NO. 55000-803 APO 170227/ 6A; LOOP VOLTAGE: 17-28 V DC; QUIESCENT CURRENT: 1.2 MA; RELAY RATING: 1A 30 V DC; INPUT MONITORING VOLTAGE: O/C; 10V DC; INPUT END OF LINE RESISTOR: 20 KOHM; INPUT SWITCH CLOSED RESISTOR: 200 OHM-11 K OHM; OPTO INPUT VOLTAGE: 35 VDC MAX; MAKE: APOLLO