Output NMEA to a VHF - Printable Version +- OpenMarine (https://forum.openmarine.net) +-- Forum: OpenPlotter (https://forum.openmarine.net/forumdisplay.php?fid=1) +--- Forum: How do I...? (https://forum.openmarine.net/forumdisplay.php?fid=3) +--- Thread: Output NMEA to a VHF (/showthread.php?tid=3331) |
Output NMEA to a VHF - Didier B - 2021-03-11 Initial situation : I have an USB GPS receiver connected to openCPC via this openCPN connection : Network, Input, Signal K, localhost, 3000, 1. And it works OK ! I need to send the position to the VHF NMEA RS232 input. What I did :
RE: Output NMEA to a VHF - PaddyB - 2021-03-12 Another option... https://github.com/SignalK/signalk-server/wiki/Events-and-Outputting-Data RE: Output NMEA to a VHF - Knoet - 2021-03-12 Hi Didier, Considering that position input to a VHF is most likely to be useful in an emergency situation, wouldn't you like to have a solution with less complexity involved? A simple standalone GPS with builtin NMEA output would be much more failsafe for this purpose. Regards RE: Output NMEA to a VHF - Didier B - 2021-03-13 (2021-03-12, 01:38 PM)Knoet Wrote: Hi Didier, You are 100 % right, all this set of connections looks like a gas refinery (in french : une usine à gaz !). Consequently, I have dramatically simplified the design : Use of one RS232 NMEA GPS connected to the VHF GPS input; Redirection in the VHF of position sentences towards the AIS output (a smart option of some recent VHFs) ; Connection RS232 from the VHF to COM/USB port on the RPi. RPi will receive both position and AIVDM and send them to Signal K and OCPN; If the VHF cannot redirect the position to the AIS output then it is possible to connect the GPS TX to both VHF and RPi RXs : in RS2132 one talker can talk to 2 listeners simultaneously ! It is anyway a safe idea to prepare and test this link in case of failure of the VHF, or to save battery on passage making ... Thanks a lot to have pushed me towards this simplification ! RE: Output NMEA to a VHF - Knoet - 2021-03-13 That sounds good, this way you get the shortest data path to the VHF that is the most important listener. One caveat, if the AIS is a transponder that also outputs SOG and COG data (VDO and/or RMC) you may get some strange effects in OpenCPN if those are not exactly the same as the GPS output. If so, some filtering might be needed. RE: Output NMEA to a VHF - SCarns - 2021-03-30 In OpenCPN you are outputting just GLL? And then on the input of SignalK you are ignoring GLL on that input? That doesn't sound right... |