So based on this https://www.cruisersforum.com/forums/f13...12967.html
it seems that my TX+ should go to NMEA+ and TX- should go to NMEA- when using the RS422. As my raymarine only have 2 nmea terminals I expect it’s because it can only receive transmissions and not send them.
Rs422 seems to use relative voltages. Not sure how to connect a similar ground or if it is even needed.
Br,
Peter
Hmm, the st4000 service manual says:
NMEA+: Intermittent streams of (nominal) 12V pulses
NMEA-: 0V
Source: http://www.ganssle.com/jack/st4000.pdf
So I’m not so sure on anything anymore. Seems that I even need at 12V signal and not a 5V as I expected..
Br, Peter
it seems that my TX+ should go to NMEA+ and TX- should go to NMEA- when using the RS422. As my raymarine only have 2 nmea terminals I expect it’s because it can only receive transmissions and not send them.
Rs422 seems to use relative voltages. Not sure how to connect a similar ground or if it is even needed.
Br,
Peter
(2020-11-27, 11:52 AM)Peter— Wrote: So based on this https://www.cruisersforum.com/forums/f13...12967.html
it seems that my TX+ should go to NMEA+ and TX- should go to NMEA- when using the RS422. As my raymarine only have 2 nmea terminals I expect it’s because it can only receive transmissions and not send them.
Rs422 seems to use relative voltages. Not sure how to connect a similar ground or if it is even needed.
Br,
Peter
Hmm, the st4000 service manual says:
NMEA+: Intermittent streams of (nominal) 12V pulses
NMEA-: 0V
Source: http://www.ganssle.com/jack/st4000.pdf
So I’m not so sure on anything anymore. Seems that I even need at 12V signal and not a 5V as I expected..
Br, Peter