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Hardware Installation
ACX 780/781 Installation Guide 33
Wiring the Keypad Inputs
You wire the keypads to the keypad inputs along the bottom of the con-
troller. The maximum length of wire to the keypad is 500 ft of #18
gauge wire (152 m of 1.0 mm
2
wire) or 200 ft of #22 gauge wire (60 m
of 0.35 mm
2
wire).
Wire the keypad inputs to the input terminals marked C1, C2, C3, R1,
R2, R3, R4 and RET as follows:
1. Slip the wire marked COL1 on the keypad under the screw marked
C1 and tighten the screw down on it.
2. Slip the wire marked COL2 on the keypad under the screw marked
C2 and tighten the screw down on it.
3. Repeat the previous step for COL3, connecting them to C3.
4. Slip the wire marked ROW1 on the keypad under the screw marked
R1 and tighten the screw down on it.
5. Slip the wire marked ROW2 on the keypad under the screw marked
R2 and tighten the screw down on it.
6. Repeat the previous step for ROW3 and ROW4, connecting them to
R3 and R4.
7. Slip the shield under the screw marked RET and tighten the screw
down on it.
8. Repeat the entire process for the second keypad.
The remaining two wires for the Essex Keypad are connected as
follows:
1. Connect the wire labeled 5VDC POWER (red) to the appropriate
+5V Reader terminal.
2. Connect the wire labeled LED (white) to the appropriate LED Read-
er terminal.
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