A digital communications port for communications with an external device over multiple conductors, the digital communications port including communication electronics for communicating radio frequency modulation (RF) communications over the multiple conductors. The digital communications port further includes bidirectional power feed electronics that are programmable to be configured to at least receive power from the external device using at least two of the multiple conductors so as to power the bidirectional power feed electronics and to power the communications electronics, or provide power to the external device using at least two of the multiple conductors so as to power the external device.