I’m trying to connect the Reach to a NMEA 0183 multiplexer (Actisense NDC-4) with no luck. The multiplexer is supposed to work with differential and single ended devices and I have tested that works fine with other differential devices I have. Also, the multiplexer is specified to work with inputs of 1.8V difference so 3,3V of the Reach should be fine.
I’ve connected Reach Tx to multiplexer A/+ and Reach Ground to multiplexer B/-, and I get just some nonsense characters. I have tried differents baudrates in the Reach and in the multiplexer.
I have performed some tests with an oscilloscope and I can confirm that Reach is sending data with 3.3 V level. The problem (I think) is that when connected to multiplexer, voltage drops to 1.5V that is below the range specified for the multiplexer, also the signal is a lot more noisy .
Any advice would be very appreciated.