Digital Monitoring Products Inc PC0086 Manual De Usuario

Wiring Specifications
When planning a keypad bus installation, keep in mind the following specifications:

1. DMP recommends using 18 or 22-gauge 

unshielded wire for all keypad and LX-Bus circuits.  Do Not use 

twisted pair or shielded wire for LX-Bus and keypad bus data circuits.  To maintain auxiliary power integrity 

when using 22-gauge wire do not exceed 500 feet.  When using 18-gauge wire do not exceed 1,000 feet.  

Install an additional power supply to increase the wire length or add devices. 

2. Maximum distance for any one circuit (length of wire) is 2,500 feet regardless of the wire gauge.  This 

distance can be in the form of one long wire run or multiple branches with all wiring totaling no more than 

2,500 feet.  As wire distance from the panel increases, DC voltage on the wire decreases.

3. Maximum number of devices per 2,500 feet circuit is 40.  

Note:  Each panel allows a specific number of supervised keypads.  Add additional keypads in the 

unsupervised mode.  Refer to the panel installation guide for the specific number of supervised keypads 

allowed.  

4. Maximum voltage drop between the panel (or auxiliary power supply) and any device is 2.0 VDC.  If the 

voltage at any device is less than the required level, add an auxiliary power supply at the end of the circuit.  

When voltage is too low, the devices cannot operate properly.  

Refer to the 710/710F Module Installation Sheet (LT-0310) for more information.  Also see the LX-Bus/Keypad Bus 

Wiring Application Note (LT-2031).    

If the current draw for all keypads exceeds the panel output, you can provide additional current by adding a Model 

505-12 auxiliary power supply.  Connect all keypad common wires to the power supply negative terminal.  Run a 

jumper wire from the power supply negative terminal to the panel common 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 504-24 and 505-12 Power Supply Installation Guide (LT-0453) for more information. 

To use 12 VDC readers with the 7075 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 White data wire from 

the reader (Data 1) to the White wire on the 5-wire keypad harness.  Connect the Green data wire from the reader 

(Data 0) to the Green/White wire on the 5-wire keypad harness.

 

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

Black –  Ground
Green – Receive Data
Yellow – Send Data 

Red – Keypad Power

– Zone 4

– Zone 3 Request to Exit (option)

– Zone 2 Door Contact (option)

– Zone 1 7/0 Panic (option)