Digital Monitoring Products, Inc. | 7800 Series Installation and Programming Guide 11
Wire the Electronic Lock
7873/7873H keypads provide a Form C (SPDT) relay for controlling locks and other
electronically-controlled barriers. The Form C relay draws up to 15mA of current and
the contacts are rated for 1Amp at 30VDC maximum, resistive. The wires marked NO
C NC allow you to connect the device wiring to the relay for module control. Use an
additional power supply to power magnetic locks and door strikes. See Figure 8 and
Figure 9.
Wire the 333 Suppressor
Use the included 333 suppressor with the keypad to suppress any surges caused
by energizing a magnetic lock or door strike. Install the 333 across the keypad C
(common) and NO (normally open) or NC (normally closed) wires.
If the device being controlled by the relay is connected to the NO and C wires, install
the suppressor on the NO and C wires. Conversely, if the device is connected to the
NC and C wires, install the 333 Suppressor on NC and C wires. See Figure 8 and
Figure 9.
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