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Old 14 December 2004, 09:57   #1
Country: UK - England
Town: Binfield
Boat name: merlinless now
Length: no boat
Join Date: Jul 2004
Posts: 452
NMEA connection of ICOM M421

Hi all

Just some helpful info if you are fitting the ICOM DSC M421 to a GSP/ chart plotter

Iím sure this may seem straight forward, but it took me a couple of hrs reading the books

1) Firstly depending on the GSP check that the data speed rate is set at 4800, and the NMEA is 0183 v2.0 3.02. If there are no settings and its fairly new then this should be the output anyway, as example my Raymarine 420 is about 3 years old and has no facility to change.
2) The connections are (switch power off before starting)

a) NMEA data out (Yellow in my case) of the GSP or plotter goes to the NMEA + of the radio, the inner core (White). Do not use the NMEA + from the GPS or plotter
b) The Data out common (brown wire in my case) of the GSP or Plotter Goes to the outer copper cable (seems like the shield). Do not use the NMEA Ė from the GPS or plotter. There is only one core so again you cannot go wrong.

Thatís it, I hope it helps

Jimbob is offline   Reply With Quote
Old 14 December 2004, 10:53   #2
Country: UK - Scotland
Town: Oban
Boat name: RIB Tickle
Make: Humber Assault
Length: 5.3m
Engine: Yamaha 60ETO,Tohatsu 3.5
Join Date: Dec 2003
Posts: 371
I had to use both + and - to get the 421 to accept the NMEA output from my Garmin plotter. One wire was fine when I had the Silva but the Icom just didn't like only one wire although in theory it shouldn't matter!
Rupert Bear is offline   Reply With Quote

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