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Old 11-01-2013, 11:02   #1
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RO4800 VHF/OpenCPN interface

Hi


I am running OpenCPN (3.1.1309) on an EEE netbook (W7) with a Qstarz 818X USB GPS. I split the Qstarz output with Xport and feed OpenCPN from one of the virtual COM ports it creates. I also run separate applications from the other virtual ports.


I plan to fit a Radio Ocean 4800 AIS VHF and would like to feed it with GPS data from OpenCPN through an RS232 serial/USB adapter. I also want to send the AIS data from the VHF to OpenCPN. The Qstarz will send data at 4800 or 38400 baud and the VHF can be configured to transmit AIS data at 4800 or 38400 baud. The VHF data connections are GPS NMEA in (+) and (-), AIS NMEA out (+) and (-). There are also unallocated NMEA out (+) and (-) connections.


Is it possible to configure OpenCPN so that both the GPS and AIS data streams can be carried on a single RS232 serial/USB connection or will I have to send the GPS data on one and receive the AIS data on another?


Thanks in advance.
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Old 11-01-2013, 11:27   #2
bcn
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Re: RO4800 VHF/OpenCPN interface

There is no problem to use just one joint port carrying GPS and AIS data.
It should be at 38400 when using AIS, if not you are in risk to saturate the port and loosing information.

bcn
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Old 11-01-2013, 11:40   #3
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Re: RO4800 VHF/OpenCPN interface

It is not a very good idea to feed the VHF from OpenCPN because you will always have to run OpenCPN (and your computer) to benefit from DSC in your VHF.
A better way will be to feed GPS to your RO4800 directly and then pass the GPS data together with AIS data to OpenCPN. The RO4800 allows to bundle the 2 output streams to your computer and OpenCPN. You will need however a serial GPS data stream to the RO4800 (NMEA0183).
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Old 11-01-2013, 12:08   #4
bcn
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Re: RO4800 VHF/OpenCPN interface

Car Code is right. Go for the more robust solution.

Should have said "inputting data into OpenCPN on one joint port is ok"
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Old 11-01-2013, 14:55   #5
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Re: RO4800 VHF/OpenCPN interface

bonsoir
ceci est correct
Michel
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Old 11-01-2013, 17:16   #6
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Re: RO4800 VHF/OpenCPN interface

Many thanks for your replies. I fully accept the wisdom of feeding the GPS signal into the RO4800 and combining it with the AIS data into OpenCPN. Unfortunately, the Qstarz 818X output is USB or Bluetooth and thus has to be connected direct to the netbook. I would be loath to change it for a different GPS. The MTK2 chipset that it contains performs particularly well.

John
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Old 12-01-2013, 01:41   #7
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Re: RO4800 VHF/OpenCPN interface

I have a separate GPS connected to the DSC VHF so the computer doesn't need to be running. They're cheap enough nowadays, so just buy another GPS for the radio.
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Old 15-01-2013, 12:58   #8
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Re: RO4800 VHF/OpenCPN interface

Hi,

RS4800 has arrived. Have only got Qstarz USB 818X as source of GPS data at present so would appreciate guidance on configuring OpenCPN COM ports to receive position data from netbook and receiving AIS data from RS4800 into OpenCPN. Following up on recommendations to obtain separate GPS receiver, suggestions would be very welcome.

Many thanks.
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