The Key reader is connected to the Relay card KEY READER connectors 1-WIRE and GND, in such a way that the Key reader red wire is connected to 1-WIRE, and the black wire to GND. The Relay card also has a mating connector for the Key reader wire connector, which can be used, for example, in the programming stage.

In cabling, use a data transfer cable, such as MHS 5x2x0.5, should be used. The maximum distance between the Relay card and the Key reader is 100 metres.