How do you correctly wire a RayStar 125 to NMEA 0183. The wiring diagram I have that came with the unit shows these wires:

Red (12-32V/+)
Yellow (NMEA out/+)
Brown (RTCM in/+)
Green (NMEA in/+)
Shield (0v/ground/-)

What wire functions as the NMEA out/-? What is the proper way to supply power (Red and Shield) with a 0.5A quick blow fuse? The instructions say to ground the Brown and Green if not used. So what NMEA data would the GPS use if it was listening to NMEA data?

Raymarine tech support supplied this comment to me:

When power is connected to the RS125's green lead, the RS125 will function as a SeaTalk GPS Sensor. When the RS125's green lead is grounded, the RS125 will function as a NMEA 0183 GPS Sensor.

The RayStar 125 documentation doesn't explain this or even allude to this needing to be necessary for the device to function as a NMEA device. Just to ground if not used.

Please elaborate.

Thanks!

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I was just reading the MUX instruction book and ran across this point:

Slower data that is input as a burst should be connected to

either NMEA In 3 or NMEA In 4, as buffered inputs. This

includes data such as GPS, route and depth information, for

which the timing is less critical. These inputs can store multiple

sentences (12 to 70, depending on length). This is necessary

for devices such as GPS, which can output 10 sentences at

once, every 1 or 2 seconds.

So, based on this information, should the RS125 be connected to NMEA 2 in as the chart indicates, or should it be connected to NMEA 3 in? If it should be connected to NMEA 3 in as the instructions suggest, where should the DSC VHF out be connected? NMEA 2 in or NMEA 4 in?

Thanks!

Should all four of the multiplexer's ports be utilized, then it would be recommended that the  GPS and DSC VHF radio be interfaced to ports 3 and 4 respectively as the increased volume of data being processed by the addition of a fourth NMEA 0183 talker may result in data loss in ports which do not feature buffering.  While you should be alright in wiring the equipment as specified previously, it certainly would not hurt to interface the GPS sensor and vhf radio to ports 3 and 4 respectively.

Bruce Bayne said:

I was just reading the MUX instruction book and ran across this point:

Slower data that is input as a burst should be connected to

either NMEA In 3 or NMEA In 4, as buffered inputs. This

includes data such as GPS, route and depth information, for

which the timing is less critical. These inputs can store multiple

sentences (12 to 70, depending on length). This is necessary

for devices such as GPS, which can output 10 sentences at

once, every 1 or 2 seconds.

So, based on this information, should the RS125 be connected to NMEA 2 in as the chart indicates, or should it be connected to NMEA 3 in? If it should be connected to NMEA 3 in as the instructions suggest, where should the DSC VHF out be connected? NMEA 2 in or NMEA 4 in?

Thanks!

Ok, now that I'm clear on all that, next question. Does the RS125 need to talk to the S3G? And if so is it doing it through the MFD via SeaTalk, or do I need to connect yet another listener (S3G NMEA in) to the NMEA out of the RS125? If I do need to connect via NMEA, which in port of the S3G do I need to connect to?

Thanks!

The S3G will receive GPS data via SeaTalk from the MFD.

One more question on this topic. Since the NMEA Multiplexer needs power and so does the RS125, can I attach the Multiplexer power in the NMEA connection grid. See attached.

Thanks!

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I would recommend that the MUX be powered by the same power circuit which will be providing power to the GPS sensor.

Each with it's own 0.5A fuse, right? So does my Signal Wiring.pdf matrix look correct?

Moderator - Raymarine, US said:

I would recommend that the MUX be powered by the same power circuit which will be providing power to the GPS sensor.

Yes, each should have it's own 1/2A fuse.  The chart looks good, except for the spelling of VHF (VHS).

:) Thanks! I appreciate the answer on a Sunday. This forum is excellent!!! Now I can finish the signal wiring today.

Glad to help out.  The forum is not typically manned by Raymarine staff on weekends ... however, I had a little down time before heading out on the lake.  As with other forums, we encourage non-Raymarine staff members to assist other forum members with posted discussions as well.  Happy Boating!

Regarding the NMEA side of an RS125, as it can transmit NMEA data when correctly wired, does this also mean you can wire a standard NMEA GPS receiver to the same point?

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