I have a gy-neo6mv2 (ublox NEO 6M GPS) that's regulated to 3.3v. I'm planning on parsing the NMEA sentences with code, but wanted to get a sample of the data before it was hooked up to a pic. After hooking it up to an RS232 port on an older computer, it's clearly exporting data, but it's gibberish. I checked several baud rates and other parameter variations in the serial communications format, but it's still gibberish. As a test, I've hooked up a 16F628A regulated to 5v that's exporting at the same baud rate some ascii data, and it imports fine. Regulated to 3.3v, it still appears to import fine.

My question is: could the ublox voltage levels be lower than 3.3v and not be adequate to trigger the threshold for an RS232 serial connection? If that's not the likely problem, and other suggestions?

Thanks,
Dave