GPS module + PIC

[flotulopex]

- Reading & parsing NMEA sentences is ok;
- Calculating checksum is ok;
- Sending data to GPS module is not ok.

I have connected the GPS module via the MAX232 chip to my serial PC port both ways so I should be able to "talk" to my module.

Unfortunately, only reading out (receiving) the GPS module is working.

I checked the MAX chip with my oscillo and the signals are okay (TX & RX) on both levels (RS232 and TTL).

I'm sending an example from the module's datasheet to enable a VTG sentence but it won't work.

<img src="http://www.picbasic.co.uk/forum/attachment.php?attachmentid=4205&stc=1&d=127141338 1">

I just never see this VTG data appear.

<img src="http://www.picbasic.co.uk/forum/attachment.php?attachmentid=4207&stc=1&d=127141381 2">

Any idea?