Old B&G Network Instrument Wiring

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I hope these may be of use to someone. Was trying to figure out how to connect new systems with NMEA0183 input / output for the old (now obsolete) B&G Network instruments.

Unfortunately the original NMEA0183 INPUT (612-0A-014) and NMEA0183 OUTPUT (610-0A-030) cables are unavailable unless one pops up on eBay. Hence this info shows how to connect in directly.

For me the most interesting document was the original (internal) design spec for the output cable. This shows the exact wiring and pin-outs for the instrument tails.

In summary:

- PIN1 (black) is a common ground for power, NMEA RX- and TX-
- PIN2 (red) is the 12V power
- PIN3 (white) is a proprietary B&G data I/O connection (2-way) between instruments
- PIN4 (green) is NMEA0183: NB RX+ in tail plugs, TX+ in tail sockets
- PIN5 (drain) is the shielding

So depending on whether you want to connect NMEA0183 IN or OUT you need to connect (or splice into the wires) of either the plug OR socket tails.