wiring colours

[leonhouse]

hi can any one help with connecting a garmin 172/172c to a silva s15 dsc radio to give gps position the radio has only two wires to use gps+ and gps - but the garmin has a host of colours eg red and black power.

blue nmea out (com 1 tx)
brown nmea in (com 1 rx)
white rtcm/nmea in (com 2 rx)
green nmea out (com 2 tx)
yellow alarm low
cheers

leon

[Waterman]

if I remember correctly its garmin blue nmea out to gps + and gps - to ground (neg) feed.
Also make sure nmea out function is switched on in gps menu.

[Poly]

Originally Posted by leonhouse

hi can any one help with connecting a garmin 172/172c to a silva s15 dsc radio to give gps position the radio has only two wires to use gps+ and gps - but the garmin has a host of colours eg red and black power.

blue nmea out (com 1 tx)
brown nmea in (com 1 rx)
white rtcm/nmea in (com 2 rx)
green nmea out (com 2 tx)
yellow alarm low
cheers

leon

I think you want to connect GARMIN BLUE to SILVA GPS+ and also join the GARMIN BLACK (battery ground) to SILVA GPS-.

(this will connect the radio to "COM 1" on your gps. You need to set up the garmin to transmit in NMEA mode on this port (somewhere in the settings). Most DSC radios seem to have the correct "listening" information so probably doesn't need any settings changed.).

[9D280]

Yep, second Pol on the Black from the Garmin.

My GPS12 uses that setup too. If it doesn't work with the Garmin set to "NMEA out", check the baud rates are the same on radio and Garmin. I forget which one I had to alter, but mine were defaulted to two different speeds.

[mike-m]

Agree with Polwart. Have just connected my Silva S10 VHF to my garmin 551 GPS on Com 2 (Com 1 feeds guidance to a Raymarine autopilot).

Connected Com 2 NMEA Tx from Garmin to the GPS +ve and the black Garmin ground lead to GPS -ve. Worked straight away!

Good luck!

[leonhouse]

thanks guys all up and running now.
blue to +
earth to -
and set up nmea out
and it all works

thanks again
leon