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14th Feb 2021, 1:54 pm

As it looks like it is a GPS device I reckon the polarity is upside down, 0 to 5V TTL (could be 3.3V, still TTL levels). I have a GPS module in my meter clock connected to a PIC micro without RS232 conversion either end, works a treat. RS232 converters invert the signal, two cancel out and one mucks* it all up. Is there an "invert" function in your terminal software?

*One way of spelling it!

14th Feb 2021, 1:54 pm	#8
Guest Guest Posts: n/a	Re: Help with RS232 needed! As it looks like it is a GPS device I reckon the polarity is upside down, 0 to 5V TTL (could be 3.3V, still TTL levels). I have a GPS module in my meter clock connected to a PIC micro without RS232 conversion either end, works a treat. RS232 converters invert the signal, two cancel out and one mucks* it all up. Is there an "invert" function in your terminal software? *One way of spelling it!