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Hello,

I'm trying to figure out about wiring scheme for rfid reader but on teltonika website says: 

Wiring White wire – 1-wire data, Brown wire – power supply, Green - ground.  but I dont see a brown wire on rfid reader

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Hello.

Please refer to your RFID reader documentation and verify how it schould be connected. Wires colours may be different, if your reader is equipped with only 2 wires, it could be powered with parasitic power:

https://os.mbed.com/users/snatch59/notebook/1-wire-parasitic-power/