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I have a NASA AIS Engine which outputs data on a serial lead on a Black wire from pin 2 and a screen from pin 5 at 38400 baud, which of the terminals do I use on the serial to USB adapter.
R- and R+ or T- and T+ or GND
Thanks,
John
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The NASA AIS puts out a sort of RS232
I use a serial to USB adapter myself ( prolific chipset )
Your adapter is NMEAv2 to USB
You can try R(eceive) + and -
Pin2 -> R+
Pin5 (shield) -> R-
If it does not work you can try to connect NASA pin5 (shield ) to GND instead of R-
Either may work.
Googling RS422 vs RS232 can provide more technical info since NMEAv2 is electrically RS422
Regards,
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My unit is an older AIS engine 2 and it sends empty AIS messages even when no signal is received
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Mine is the original one, going to get the chip upgrade when I see it working.
Tried every combination now and not seen any message in inspector. Confident I have open plotter setup correctly with the correct port and baud 38400 but not seen anything in inspector nor have I seen the green led on the serial to usb convertor light. I set open plotter to output to the convertor and the red light was flickering fine though obviously the AIS engine could do nothing with the data.
Thanks,
John
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I think that my converter could be faulty. I have set it up to input the GPS nmea data into the AIS engine, the red led is flickering away and I have a 2.2V to 0V signal out of the converter into the AIS. And I have a slower 0V to 0.25V signal on the black and screen wire from th AIS engine. But there is a permanent 4.6 V between R- and R+ and between R+ and GND on the converter. With no signal being sent or received surely there should not be 4.6V there.
Anyone able to test there own?
Thanks,
John