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TNC-Pi is a terminal node controller device, GPIO add-on board used by amateur radio operators to participate in AX.25 packet radio networks.

TNC-Pi is a special version of TNC-X designed to interface directly with the Raspberry Pi computer. It can connect to the Pi either via the Pi's serial port or via the I2C protocol. In the latter case, a single Pi can support multiple TNC-Pi's at the same time, since each TNC-Pi can be given a unique I2C address.


The TNC-Pi features a 9 pin D-Sub port and GPIO through port allowing TNC-Pis to be stacked.


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