accessing the GSM modem using serialport in windows OS

[jjbabu]

Thanx for ur help calhal & katrina,

yah,what u told ,i completed already,

i checked my Gsm modem by connecting with com port and passed At commands using MS Hyperterminal,the modem works fine at that time,i sended sms message from PC to another mobile using that AT commands.
we set the port and modem for 9600,8bit,no parity.

My doubt was,how can i send "ENTER","CNTR+Z" signals of keyboard from my source code.can i give "\n" for "ENTER" signal?

one more doubt is, after sending command to the modem,i will verify that"OK" response in the PC side,it will take some delay for this,how can i avoid the delay problem in this issue.

u are really helpful to me,
thanx alot..........

[calhal]

My doubt was,how can i send "ENTER","CNTR+Z" signals of keyboard from my source code.can i give "\n" for "ENTER" signal?

I think enter is rather "\r\n" in this case. ctrl+z is a SUB character. IIRC it has 0x1a hex code.

one more doubt is, after sending command to the modem,i will verify that"OK" response in the PC side,it will take some delay for this,how can i avoid the delay problem in this issue.

I don't know if I understand correctly your question. I'd use a QTimer to receive data from RS232, then emit some signal when got "OK" and connect it to right slot. Same for other commands received from modem.

[jjbabu]

Hi calhal

I think enter is rather "\r\n" in this case. ctrl+z is a SUB character. IIRC it has 0x1a hex code.

If u dont mind can u give me some more clarity regarding "CNTR+Z" signal,i understood about that "enter" signal,but i didnt abt "CNTR+Z".

In the source code what i have to mention for "CNTR+Z"?
can u give me any example abt this,

thanks,

[calhal]

In the source code what i have to mention for "CNTR+Z"?
can u give me any example abt this

When you press cntr+z in some serial terminal software, it will simply send ascii char representing this cntr+z.
Here is some link http://www.cisco.com/en/US/docs/ios/.../papascii.html

So in fact you must send this char to gsm modem. It would be string with something like "\x1a".