Passive Infra-Red Alarm (490-0308) Connections Faxback Doc. # 32316 Connections to a Digital Key Switch (490-0535) Terminal 1 on the Alarm to the 12 V power + with a jumper to the Common switch terminal on the Key Switch Terminal 2 to the NO terminal on the Key Switch with a jumper to arm LED + At terminal 8 (ext-) on the alarm, go to Power - with a jumper to Arm Led - The latch switch must be set to the IN position On the Key Switch, connect a jumper from the LED to Power and from Power to the Ext. Alarm Out on the Alarm. (IR/ir-05/28/96)