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
And several other even more ridicules combinations, all to the same result, the echo.
What can I do to make this thing work?