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Tips and questions relating to the GPS modules from SFE
By JAM
#140856
I'm using the telit GM862-GPS with a TI MSP430G2553 microcontroller. I can receive the debug echo from the serial communication but the device does not execute any of the AT-COMMANDs.

Hardware configuration
MCU---GSM
Rx ---- Tx
Tx ----- Rx
--------- RTS - GRD
--------- DTR - Pulled up

The voltage levels are within operating parameters.

I've played with the baud rate, every configuration I've tried ends with the same result.

I end all lines with '\r'. I've even tried:
\015
\0x0D
\0D
\0x0d
\0d
\r\n
\n\r
/r
/r/n
/n/r
<CR>
<cr>

And several other even more ridicules combinations, all to the same result, the echo.


What can I do to make this thing work?