Originally Posted by Hoghead
Raystar 125 wiring code:
Red = 12V power
Yellow = NMEA out +
Brown = RTCM in +
Green = NMEA in +
Shield = ground
What is RTCM in +
Where is the NMEA Out -
A footnote in the instructions says:
If the brown and green wires are not used, tie both to the ground
My interpretation is as follows, based entirely on your information quoted above:
RAYSTAR 125 NMEA-0183
TALKER A = yellow
TALKER B = not provided
LISTENER A = green
LISTENER B = not provided
To interconnect with other NMEA-0183 devices, refer to my guidelines mentioned to you earlier in earlier discussions. See
GUIDE TO NMEA-0183 INTERCONNECTIONS
continuousWave: Whaler: Reference: NMEA-0183 Interconnection Guide
The brown wire is probably an input for differential GPS correction data being sent using the RTCM SC-104 format. For more information on differential GPS correction data in this format see
DGNSS Standards - Navipedia
RTCM is an acronym for Radio Technical Commission for Maritime Services. SC is an acronym for Special Committee.
SC-104 is a special committee that works on differential GNSS standards.
You can also assume the brown wire is a NMEA-0183 electrical
signal wire, so it would then be
LISTENER A = brown (for RTCM SC-104 data)
In you do not have a differential GPS receiver you can ignore that input.
If you have a differential GPS receiver, check to see if there is any differential GPS local system in your region (Philippines). Your local marine
authorities would know what frequencies to tune the receiver to obtain the correction data. Note that differential GPS (DGPS) is not used much these days in North America by recreational boaters, but might still be working in other regions and more popular there with recreational boaters.