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Humminbird 998 to Simrad RS12 via NMEA 0183

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Humminbird 998 to Simrad RS12 via NMEA 0183

Old 07-06-2014, 06:52 PM
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Default Humminbird 998 to Simrad RS12 via NMEA 0183

I now have a Humminbird 859 CI HD and 998C HD DI sitting side by side on my console. I'm trying to connect the 998 to my Simrad RS12 VHF radio via NMEA 0183. I found the pigtail coming off the GR50 GPS puck and it has white (+), green (+), and black (gnd)wires. The adapter cable coming off the Simrad has the following options: orange-nmea out(+), green - nmea in(-), yellow - nmea in(+), or black - nmea out (-). The Simrad and HBs both use a baud rate of 4800. I've turned on NMEA 0183 in the radio and on both Humminbirds (the HBs share the same GPS puck via a splitter cable if that makes any difference). I tried every wire combination I could think of and I can't get the lat-long to display on the VHF. After changing wire combinations I switched the VHF off and then back on, but I didn't try rebooting the HBs. After looking at the wiring charts it appears to me that the correct combination should be black to black and HB green to VHF green or HB white to VHF green, but I also tried white to yellow and green to yellow. I twisted the wires together for testing purposes. Any suggestions on what else to try? Should I reboot the HBs after making a wiring change or should the lat-lon display almost as soon as the correct connection is made? Should NMEA 0183 be switched on or off in the 859 if the 998 is the primary unit or should it make any difference? Thanks for any suggestions.

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