GARMIN/TACKTICK Interface

[richardbrennan]

I am trying to help a friend interface a newly acquired Garmin 750 plotter with his Tacktick instruments using NMEA 0183. The Garmin side looks relatively straight forward with the brown wire being NMEA 0183 in and the blue wire being NMEA 0183 out with a common negative as the return. We have a Tacktick NMEA interface box and the terminals on this are rather less straight forward; there eleven in all two are simply for power and one is for an alarm that we are not using. The other eight are in three groups, the first of these is a group of four bracketed as GPS and there is a power out both positive and negative and NMEA 1 in which also has two terminals with in arrows labelled plus and minus. My assumption is that these would be used if there was a separate GPS receiver rather than the one inbuilt into the Garmin 750. there are two other groups one labelled NMEA 2 with input arrows labelled as positive and negative nd the other labelled NMEA out again with positive and negative output arrows.

The obvious way of wiring the two together would seem to be the blue Garmin wire to the NMEA 2 positive and the brown Garmin wire to the Nmea out positive and all the negatives to the common ground. However, this does not seem to work and we have tried about just about every other combination of wires as well. The port on the 750 is set to NMEA standard but the diagnostics are showing nothing being received.

Any advice on what to do next will be gratefully received.

 

[pvb]

Try this. Connect the Garmin NMEA in (brown) to the positive "NMEA Out" terminal of the Tacktick interface. Connect the Garmin NMEA out (blue) to the positive "NMEA 1" terminal of the Tacktick interface. Connect the Garmin ground to the negative terminal (either on NMEA 1 or NMEA Out). You'll need to configure the Garmin's ports to transmit/receive appropriately.

 

[richardbrennan]

Thank you PVB, I think we tried this already but will give it another go.

 

[ex-Gladys]

I did this last year with my 551 to tacktick, and powered the GPS from the Tacktick NMEA box. Talking to someone else who has been connecting a radio to a GPS, I believe there are considerable benefits from having as much of supply and comms common...