8
External Access Control Reader
To accept Wiegand data input from other external card readers, connect a 12VDC external
reader to the 7873 keypad. Connect the red and black power wires from the reader to
the power wires from the panel. These connect in parallel with the keypad power wires.
Connect the Reader (Data 1) wire to the white wire on the 5–wire keypad harness. Connect
the Reader (Data 0) wire to the green/white wire on the 5–wire keypad harness. See
Figure 3.
Magnetic Lock and Door Strike Wiring
The 7873 keypad provides one internal programmable
Form C single pole, double throw (SPDT) relay for
controlling door strikes or magnetic locks. Three wires
on the 5-wire harness, violet normally closed (N/C),
gray common (COM), and orange normally open
(N/O), allow you to connect devices to the relay. The
Form C relay draws up to 15mA of current and the
contacts are rated for 1 Amp at 30VDC maximum,
resistive.
Wiring the 333 Suppressor
One Model 333 Suppressor is included with
the 7873 keypad. If the device being controlled
by the relay is connected to the N/O and C
wires, install the suppressor on the N/O and
C wires. If the device is connected to the N/C
and C wires, install the 333 on N/C and C
wires. Refer to Figure 4a and 4b.
Using the 7800 Keypad for Access Control
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