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16345RE: T3-mini serial ports information

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  • excitontx
    Feb 12, 2014
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      Indeed, you do need to get the voltage levels and polarities correct for the TTL and RS232 settings.  There is also a polarity issue with respect to the received data.  If you search this Group, you will see some comments using the "PATCH" command to set the received GPS polarity. (PATCH 005FFF0102 will invert RX polarity, and PATCH 005FFF0100 will set it back).  I have used several GPS brands/models with the T3, some need inversion and some not.  And lastly, you need to be sure that the GPS is sending out sentences that the T3 will read (T3 works with $GPRMC, $GPGGA, and $GPGLL sentences).  Good luck,
      Chuck / KG5CA
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