DoorKing 1812 Owner's Manual download pdf (Page 18)

1.6 TELEPHONE LINE WIRING – MULTIPLE UNITS

If any alarm systems are installed on the phone line, be sure that the alarm interface precedes the

1812 by-pass switch interface.

DOORKING

1875-010

GND

C.O.

1 2

PH IN

3 4

PH OUT

5 6

HOME

7 8

ENTRY BY-PASS

Ground

C.O.

Demarcation

Home

Telephones

Phone In - 1

Phone In - 2

Case Ground - 3

Phone Out - 4

Phone Out - 5

1812 #1

Main

Terminal

1 - Phone In

2 - Phone In

3 - Case Ground

4 - Phone Out

5 - Phone Out

1812 #2

Main

Terminal

Use only twisted pair telephone

wire that is rated for direct

underground burial. Do not use

wire designed for indoor

applications.

Use this wiring scheme if more than one 1812 will be installed on the same phone line. Up to five (5)

1812 units may be wired in series using this method. Additional units are connected PHONE OUT to

PHONE IN; PHONE OUT to PHONE IN, etc.

Each 1812 unit must be programmed for MULTIPLE SYSTEMS, each must be programmed with a

unique ATTENTION NUMBER, and each must be programmed with a unique MASTER CODE.

1. Connect PHONE IN wires from BY-PASS switch to 1812 #1 PHONE IN terminals 1 & 2.

2. Connect PHONE OUT wires from 1812 #1 (terminals 4 & 5) to 1812 #2 PHONE IN

terminals 1 & 2.

3. Connect PHONE OUT wires from 1812 #2 (terminals 4 & 5) to PHONE OUT terminals on

the BY-PASS switch.

4. Check for polarity on the phone "IN" wires, terminals 1 and 2. Terminal 2 must be positive

with respect to terminal 1. Set a VOM meter to measure DC volts. Place the positive lead

on terminal 2 and the negative lead on terminal 1. If the meter shows a positive voltage -

OK. If the meter shows a negative voltage (needle moves off scale to the left), reverse

the wires on terminals 1 and 2.

5. Surge protection is recommended on both phone in and phone out lines. Use DoorKing

phone line surge suppressers (p/n 1877-010) or equivalent.

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DoorKing 1812 Owner's Manual Page 18

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