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[Reply #15 on:]

Blue (arduino right side) - TX
Black (arduino right side) - RX
Red (arduino left side) - 5V
Black (arduino left side) - GND

DB9
Pin 5 - GND
Pin 2 - RX ( Pin 14 of MAX3232)
Pin 3 - TX ( Pin 13 of MAX3232)

[Reply #16 on:]

Anyone know whats the problem of my system??

[Reply #17 on:]

Here is a code snippet of mine that sends a text message of two temperature measurements to my phone.

Code:

       
Serial.println("AT+CMGF=1");
        delay(2000);
        Serial.println("AT+CMGS=1XXXXXXXXXX,129");
        delay(500);
        Serial.print("High Temp = "); Serial.print(hightemp, DEC);
        Serial.print(" Low Temp = "); Serial.print(lowtemp, DEC);
        Serial.println(26,BYTE);

You do need to append either a "129" or "145" on the CMGS command to indicate national or international dialing. I am not sure what your "Serial.print(0x0D,BYTE)" is intended to do. The correct message terminator is a "control-z", which is represented by: "Serial.println(26,BYTE)." You do need the println format to send a carriage return/line feed.

[Reply #18 on:]

Thanks i'll try that out.
But from what i've tested the computer requires a 5wire connection (RX, TX, RTS, CTS and GND) and the arduino can only support 3.
Anyone can enlighten me on how to interface it with a arduino?

[Reply #19 on:]

Thanks i'll try that out.
But from what i've tested the computer requires a 5wire connection (RX, TX, RTS, CTS and GND) and the arduino can only support 3.
Anyone can enlighten me on how to interface it with a arduino?

RTS and CTS are for flow control. They are not absolutely required, and you can configure the PC UART not to require them (I believe that is the default condition).