to the TNC using the KISS (TNC) protocol or the 6PACK protocol. Modern Software TNCs provide TCP/IP interfaces that can be accessed across computer networks. For example, it is possible to run a software TNC on a Raspberry Pi near the radio and access it from a laptop computer in another location. Software TNCs also provide "pseudo terminals" so they can be used with old applications that only know how to use serial ports. See also Wireless modem References External links Tucson Amateur Packet Radio (TAPR) Help getting started in APRS Inventor of APRS' website SYMEK Packet-Radio-Controller (TNC) for amateur-radio AEA PK-232 to 6-pin MiniDIN wiring diagram Software for AEA and Kantronics TNCs Arduino TNC Packet radio