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Old 18-06-2016, 13:15   #1
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Feeding GPS into icon M802 from XB8000 vespermarine AIS

I'm trying to feed GPS signal from vespermarine XB8000 AIS transponder into my M802 unit that accepts the BNC connector (coax cable).

I connected the data output (+) wire to the center pin and the data output (-) wire to the shield of the coax cable. But I am not getting any GPS info displayed on the M802 unit.

How could I correct the problem?


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Old 18-06-2016, 16:32   #2
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Re: Feeding GPS into icon M802 from XB8000 vespermarine AIS

the 802 is very picky and only accpets one nmea 183 sentance. and the vesper is probably pretty limited in sentences considering AIS's are not really designed to share GPS but some do.

you'd also have to make sure the vesper is in 4800 baud mode. I'm not sure if the vespers give out GPS data out at this speed or if the 4800 output port justs mux the input port. it may only put out gps data on the 38,400 line.

you'd have to get a sentance reading device on the output to see what you're getting. like a laptop with a serial port.

in the end it's probably not likely to work. I think the garmin 19x antenna is still available in nmea 183 if you need to buy something to feed it with.

the last boat I put a 802 into had a raymarine nav system and versper AIS and I ended up having to buy the garmin 19x to feed it.
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Old 19-06-2016, 12:39   #3
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Re: Feeding GPS into icon M802 from XB8000 vespermarine AIS

Thanks for the hint.
I changed the NMEA output baud rate on the AIS transponder, and it works. Ship's GPS coordinates and UTC are now displayed on the M802. The AIS signal coming to the chart plotter (iNavX on iPad and OpenCPN on Mac) thru the wifi network was not affected by the baud rate change.

Thanks again
Danny


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Old 19-06-2016, 13:07   #4
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Re: Feeding GPS into icon M802 from XB8000 vespermarine AIS

cool. I am surprised but glad it worked for you.
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Old 19-06-2016, 13:16   #5
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Re: Feeding GPS into icon M802 from XB8000 vespermarine AIS

Quote:
Originally Posted by smac999 View Post
the 802 is very picky and only accpets one nmea 183 sentance. and the vesper is probably pretty limited in sentences considering AIS's are not really designed to share GPS but some do.
That's true for all other AIS transponders, but not the XB-8000. It's designed to be a primary GPS and outputs all the necessary GPS sentences.

Quote:
Originally Posted by smac999 View Post
you'd also have to make sure the vesper is in 4800 baud mode. I'm not sure if the vespers give out GPS data out at this speed or if the 4800 output port justs mux the input port. it may only put out gps data on the 38,400 line.
Yes, you are correct. Switch the XB-8000 to 4800 baud output from the default of 38400. It outputs all GPS data at 4800 baud. However, it can't output AIS data at 4800.

Quote:
Originally Posted by smac999 View Post
you'd have to get a sentance reading device on the output to see what you're getting. like a laptop with a serial port.
It's always handy to be able to view the actual sentences if you are troubleshooting, but there is a list of the output sentences in the XB-8000 installation guide.

Quote:
Originally Posted by smac999 View Post
in the end it's probably not likely to work. I think the garmin 19x antenna is still available in nmea 183 if you need to buy something to feed it with.
Actually, it will work fine. The only exception is if you need both AIS and GPS data and you are connecting a device that only operates at 4800 baud. In that case you can use a NMEA 0183 multiplexer like the Brookhouse or Shipmodul that takes the 38400 baud output and splits it into two separate feeds at the different speeds by filtering out the high-speed sentences.

Quote:
Originally Posted by smac999 View Post
the last boat I put a 802 into had a raymarine nav system and versper AIS and I ended up having to buy the garmin 19x to feed it.
Yes, this is a good alternative to the multiplexer but does require installing another GPS.
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