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Connecting a DM iButton Reader to the Dart3

The Digital Matter iButton Reader has the following wire colours:

Wire ColorFunction
RediButton Signal Line
GreenGreen LED
(with 1000 ohm resistor)
BrownRed LED
(with 1000 ohm resistor)
YellowLED Negative

Dart 3 Wiring Guide - DART3 12-wire Harness Definition.

Connecting an iButton Reader to the Dart3 Harness

Cut the 4 way Molex plug off the Harness. (Ensure you won't be using it with a DM RFID reader first)

  • Connect Brown (Driver ID 1 - Pin 10) to the Red iButton Signal Line
  • Connect a Black wire (Dart3 Ground) to the Black Ground on the iButton reader


The Dart3 must be told to expect an iButton input in parameters, by default it is expecting DM RFID reader input over these wires. 

LED Flash Output

The System Rail Output wire (Purple) can be used to flash an LED. If you wish to use the LED in the iButton harness, connect the following:

Dart HarnessIButton Wire
Purple (System Rail out)LED Positive Wire
  • Red LED - Brown Wire
  • Green LED - Green Wire
Black (TTL Ground)LED Negative (Yellow)

LED Blinks on No Driver ID
iButton WireDart Harness
Brown Or GreenPurple (System rail out)
Red Brown

Special System parameters required:

LED turns on with Ignition
iButton WireDart Harness
Brown Or Green
(If you want the LED to change colour on ignition, connect one LED to External Power)
LED Turns off with Tag Scan

(Pdf attached for wiring diagram)

iButton WireDart Harness WireRelay Wire
RedBrown & Green-
Brown and/or GreenRedPurple
Yellow & BlackYellowWhite

Special System parameters required:


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