Installation guide

7800 Series Keypad Installation Guide 3
Harness Wiring
Figure 5 shows wiring harness assignments. Observe wire colors when connecting the
red, yellow, green, and black wires to the keypad bus. Connect red to panel terminal
7, yellow to terminal 8, green to terminal 9, and black to panel terminal 10. Use 1k
Ohm EOL resistors, DMP Model 311, on keypad zones 1 through 4.
The 7872/7873 keypads are supplied with a 12-wire data bus/zone harness. Four
wires connect to the keypad bus. The remaining eight wires are for the four zone
inputs: two wires for each zone.
The 7873 keypad comes with one 5-wire output/reader
harness for connection of external reader/door strike and is
inserted into the J4 keypad terminal.
When replacing a 32-character keypad that uses a standard
12-position harness, the 300-7800-12ADPT 12-position wire
harness adaptor is available to adapt the larger connector to
the smaller 7800 Series connector (J5) without the need to
splice wires.
Note: Do not remove the PCB from the keypad housing to
install the wiring harness. Firmly grasp the wires near the
base and hold the outside edges of the keypad housing. Line
up the red and yellow wires with the guides on the board to
insert the connector into the J5 keypad terminal. See Figure 4
for example.
Additional Power Supply
If the current draw for all keypads exceeds the panel output, provide additional
current by adding a Model 505-12 auxiliary power supply. Connect all keypad black
ground wires to the power supply negative terminal. Run a jumper wire from the
power supply negative terminal to the panel common ground terminal. Connect all
keypad power (+12 VDC) wires to the power supply positive terminal. Do NOT connect
the power supply positive terminal to any panel terminal. Refer to the 505-12 Power
Supply Installation Guide (LT-0453).
Figure 4: Installing the
Wiring Harness
J5
Y/W
R
1K EOL
1K EOL
1K EOL
1K EOL
Green/White – Connect Reader Data 0
White – Connect Reader Data 1
Orange – Door Strike Normally Open
Gray – Door Strike Common
Violet – Door Strike Normally Closed
Yellow/White
White/Yellow
Orange White
White/Orange
Red/White
White/Red
Brown/White
White/Brown
Black – Ground
Green – Receive Data
Yellow – Send Data
Red – Keypad Power
– Zone 1
– Zone 2
– Zone 3
– Zone 4
External Reader/Door Strike
7873 Keypad
All Keypads
Zones 1 to 4
7872 / 7873 Keypads
7873 Back
J5 J4
Y/W
R
G/W
V
Figure 5: Keypad Back Showing Wiring Harness Assignments