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There are four (4) auxiliary terminals on the 1840 control board which provide inputs for: weigand
data, elevator control, RS232 communication, and power for these various features.
2.2.1 Weigand Power Terminals
16 VAC, 20 VA power must be supplied to these power terminals; otherwise RS232 communication
and all weigand devices will fail to operate. Do not power any other devices (electric strikes,
magnetic locks, lights, etc.) from this transformer. Do not run 16 VAC weigand power lines over 200
feet. Use only U.L. listed 600 volt insulated wire for RS232 / weigand power wiring. It is advisable to
keep these wires as short as possible. Use 18 AWG wire for wire runs up to 100 feet, and 16 AWG
wire for wire runs up to 200 feet. Install a low voltage surge suppresser (DoorKing p/n 1878-010 or
equivalent) to help protect the circuit board from power surges.
2.2.2 Weigand Data Terminals
These terminals are used to input weigand data to the circuit board from external weigand devices
such as card readers, weigand keypads, RF receivers, etc. These terminals are also used to input
weigand data from the Tracker boards when they are used to expand the system.
The 16 VAC available on weigand terminals 1 and 2 (not the two weigand power terminals) is used
for lights only. For example, a weigand card reader may have lights built into the housing that will
require 16 VAC power for the lights to illuminate. Do not power any other devices (electric strikes,
magnetic locks, etc.) from this power source.
Maximum wire run for weigand data is 500 feet using Belden 9931, Consolidated 5324-CL, or
equivalent six (6) conductor shielded wire. Do not use twisted pair with weigand format. Float the
shield at the weigand device. Do not connect the shield to the weigand device common.
If Tracker expansion boards are being used with this system, refer to the Tracker Installation and
Wiring manual that came with the Tracker expansion boards, for detailed information on wiring
Tracker boards to the PC programmable telephone entry system.
2.2 WEIGAND TERMINAL DESCRIPTION
TERMINAL DESCRIPTION
1 16 VAC, 20 VA Weigand Input Power.
100 ft. maximum with 18 AWG wire; 200 ft. maximum with 16 AWG wire.
2 16 VAC, 20 VA Weigand Input Power.
100 ft. maximum with 18 AWG wire; 200 ft. maximum with 16 AWG wire.
TERMINAL DESCRIPTION
10 +12 VDC POWER
9 COMMON
8 DATA 1
7 DATA 0
Weigand devices connected to these
terminals will activate RELAY 1 on
the main control board when a valid
code is received by the device.
6 +12 VDC POWER
5 COMMON
4 DATA 1
3 DATA 0
Weigand devices connected to these
terminals will activate RELAY 2 on
the main control board when a valid
code is received by the device.
2 16 VAC Light Power
1 16 VAC Light Power
Used for light power only.
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