Hi Folks,
I'm trying to build a simple application that can dial a phone number of another modem (connected to a PC) or can recieve a call from another modem.
I've expiramented both ways using an instance of HyperTerminal on each PC and it works fine. One dials, the other answers and the connection is established.
I can't get this to happen when on one side I have my C application instead of HyperTerminal. I've used the same settings as with HyperTerminal so it's verified that I have the correct parameters.
The code I use basicaly initializes the port setting and then performs a "WriteFile" function call. After that I'm supposed to hear the modem dial (in case I'm the side that's dialing) but nothing happens.
The code I used is very similar to what's in: http://web6.codeproject.co
The only difference is that before WriteFile I have:
strcpy(command, "ATZ\aATD45716\a"); // command for modem
where the number I dial is 45716.
I case I'm trying to pick up a call my command is:
strcpy(command, "ATZ\aATS0=1\a"); // command for modem
Any idea where the problem is and how I can get this to work?
Thanks in advance.
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One big problem is the modem expects the "A" and the "T" to come in with a typing-like pause in between them, so the modem can figure out the baud rate, parity, and number of stop bits.
try writing the characters out ONE at a TIME, with say 1/4 second pause between them. Might work better.
In general talking to a modem is very iffy-- the exact timing and responses are not all that well defined.
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by: daohailamPosted on 2006-10-26 at 09:03:54ID: 17812922
IMO, it should be \r or \n or both \r\n instead of \a ?