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Dry Contact I/O Accessory (AP9810) Technical Guide2
Connecting dry contact devices to the Zone A and B terminals on the screw terminal
block
The sensing voltage available on the Zone A and B pins of the Dry Contact I/O Accessory is
nominally 5 Vdc at less than 1 mA, referenced to system ground.
Connecting a device to the power output (Pwr) terminals on the screw terminal block
You can use the NO/GND terminal on the screw terminal block to connect Normally Open (NO) dry
contact devices and to connect a device to the power output (Pwr) terminals.