"luc" wrote in message
oups.com...
getting back to Speckfisher's original post, is there a way to test
NMEA out/in with a meter, or do you need a laptop/software to do so?

With a meter you'll only see a fluctating voltage. It's easy to test with a
laptop and a serial cable. Start a terminal program, set it to 4800 baud, 8
databits, 1 stopbit, no parity, no flow control. Now you can tap in on every
NMEA signal. Let the laptop run on it's battery and you don't need galvanic
isolation for this test. Pin 5 on the 9-pin connector is ground, pin 2 is
the input to the laptop. Always connect ground first....

Meindert