Receving String correctly on RS232

Rabbit
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1

Hi,

i’m making a software with an RCM3700 module to communicate with a GPRS modem using AT commands.

I’ve experiencing some problems during receiving.
Sending a request for inserting PIN i’m sending:

“AT+CPIN=7159\x0d\x0a” the modem is doing what expected but i cannot parse the response.

The supposed response is: “0\r” the first time a send the command and “4\r” next times (because the pin is already given)

Unfortunately the response I receive is different every time I send the command. Sometimes “null” other times “šÃšÃ” rarely the correct answer

serDopen(115200);
serDflowcontrolOff();
serDwrite(“AT+CPIN=XXXX\x0d\x0a”,15);
serDread(buffer,80,2000)

the last two lines are in a costate it shouldn’t be a problem I think…

anyone has any advice

2

Have you tried sending just the command characters? You are specifying 15 characters instead of 14, and the null at the end might be confusing the modem.