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The trb142 has a 4-pin power-connection.

In the wiki 2 pins are named I/O.

How can I use them?

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Hi,

You can use it to connect power supply or you can connect 4 pin power cable with 4-way screw terminal to setup your needs. Inputs and outputs are used for monitoring and controlling a connected device or receiving signals from that device in order to trigger certain events.

https://teltonika.lt/product/eu-power-supply-4pin/

https://teltonika.lt/product/4pin-power-cable-4way/