I am trying to get the raymarine
instruments working and have some issues with seatalk
bus. I am looking for inputs from those with more knowledge in electronics
and have worked on seatalk
I have absolutely no activity on the bus. therefore C70 MFD is not showing any data. I have tried various combinations of MFD with ST60Plus depth
and ST60plus boat
speed as well as raystar RS125 GPS
. These are the only instruments that are powering up. Autopilot
was shot, and so was ST60plus wind
so I had to remove them from the bus.
I get a flat 11.9V between yellow to shield on the scope
. I have a 5A fused power to the buss from the switch. Raystar 125 blinks green every 4 seconds indicating it has a GPS
fix, but when i add RS125 to the buss, yellow signal wire shows pulses only going up to about 6V.
I buzzed out the wire for continuity from the back of RS125 connector to the splice behind MFD and it all checked out good.
If i am not mistaking, seatalk should be pulled up to 12V if not active.
So I am wondering if Raystar 125 seatalk interface is blown?
Also should speed and depth
ST60plus be sending data? Or should the MFD request the data in order for instruments to send it back?
I also tried raystar 125 in NMEA 0183
mode, disconnecting seatalk altogether and using NEMA IN on the MFD. But I saw no activity on the yellow NEMA + to shield Nema-. RS125 was blinking green every two seconds indicating a GPS fix and is in NEMA out mode.