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Q2686 GSM/GPRS module

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ularc

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On the PCB the dsp33fj256gp710 MCU has a uart connection with the Q2686 GSM/GPRS module using a rs232 connection it is a four wire UART connection Tx, RX, CTS, RTS and on the Q2686 the DTR is tried to GND.

the MCU is configured as a DTE 3v6 the Q2686 is configured as DCE is 2V8

Transmit
Tx ------------Tx,

Recieve
RX-------------RX,

waits for signal to send

CTS-----------CTS,


RTS------------RTS

DTR


their is a voltage leveller between the MCU Q2686 .

using AT command the MCU I can poll the Q2686 to send a SMS using GSM network

or to send a email using SMTP on the GPRS network "IP ADDRESSING".

using character and string arrays


my problem is cannot recieve any data back from Q2686
tried interrupts but buffer only kept filling with echo character from AT commands send from MUC

when I turned of ECHO no reponse.

my am know using a getcgar() function to wait for character but this did not work either.

any had advice or help would be appericated
 

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