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Connector

The connector is a RJ12 (6P6C, phone connector with all 6 positions populated) The interface uses RS-232 levels (±15V)

Pinout

Seen from the end of the RJ12 plug

    ┌───┐
┌───┘   └───┐
│           │
├─┬─┬─┬─┬─┬─┤
│1│2│3│4│5│6│
└─┴─┴─┴─┴─┴─┘

TX
RX
GND
GND
+V
+V

+V seems to be a regulated 14.6V supply, current limited by a 100Ω resistor RX and TX has 100Ω resistors in series.