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Another nmea 183 question.

Old 09-13-2020, 12:51 PM
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Default Another nmea 183 question.

So I have a Garmin. network. A SH matrix radio and a icom 506 radio both that will only work on 183. I also have an older Simrad autopilot on 183. I have the icom on port 1 of the Garmin and the Simrad on port2

They are both working perfectly

as soon as I hook up the matrix on either port the other device on that port stops working. The Simrad won’t track to a waypoint and the icom looses its position and speed. If I don’t hook the matrix up I keep getting an alarm of no position data out of it.

any ideas?
Old 09-13-2020, 02:39 PM
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I don't know that NMEA 0183 is properly called a "network"
its a “single talker/multiple listener interface":

you can connect a "talker" to more than one "listener"

but a 'listener" can be connected to only one "talker"
lest the communication is disrupted

making it more even interesting,
manufacturers uses different wire colors,
and different nomenclature for 'talker' and 'listener'

I suspect you are mis-connecting the SH Matrix:
as a 'talker' instead of as a second 'listener'


Old 09-13-2020, 03:17 PM
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is the matrix an AIS model?

Old 09-13-2020, 03:50 PM
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Originally Posted by smac999 View Post
is the matrix an AIS model?
yes it is
Old 09-13-2020, 07:36 PM
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Originally Posted by offshorebri View Post
yes it is

then it's probably at 38,400 baud. you're probably going to want to put the icom and pilot on one port and the matrix on the other.

what model is it? the very first one is harder to set up.
Old 09-13-2020, 07:46 PM
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Have you been able to hook the matrix up on its own port as a listener successfully?
Old 09-16-2020, 07:41 AM
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If the radio under discussion is a Standard-Horizon GX2150, for advice on NMEA-0183 interface see

NMEA-0183 Interface: GX2150, a Difficult Example - CONTINUOUSWAVE


Last edited by jhebert; 09-16-2020 at 10:28 AM.

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