Dialing modem

[T M Gray]

Are you sure it isn't just dialing pulse? That can be harder to hear than tone. You should use ATDT just to make sure.

[Evgeni57]

I used ATDT as well - no sound :(

[Luc Pattyn]

I don't know, however I would insert a big delay (3 seconds as a first experiment) between every pair of statements, so the system can settle before your program continues; as it is now, it is all done in a few milliseconds, maybe something isn't fast enough to keep up. If that helps, you then can reduce the delays until it starts to fail again. :)

Luc Pattyn [Forum Guidelines] [Why QA sucks] [My Articles] Nil Volentibus Arduum

Please use <PRE> tags for code snippets, they preserve indentation, and improve readability.

[monstale]

Hi, what does modem answer to each command? Bye

[Evgeni57]

this is the code:

   serialPort1.DataReceived += new SerialDataReceivedEventHandler(serialPort1\_DataReceiver);
        serialPort1.Open();
        string answer;
        serialPort1.Write("ATM2\\r");
        answer = serialPort1.ReadLine();          //answer = "\\r"
        serialPort1.Write("ATL3\\r");
        answer = serialPort1.ReadLine();          //answer = "OK\\r"
        serialPort1.Write("ATDT" + phone + "\\r");
        answer = serialPort1.ReadLine();          //answer = "\\r"
        serialPort1.Write("ATH\\r");
        answer = serialPort1.ReadLine();          //answer = "OK\\r"
        serialPort1.Close();

'answer's' value are commented. thanks.

[Evgeni57]

tried to put 3 seconds sleep between each command, but it still dials withut the sound.

[monstale]

Hi, please try ATM1\r instead of ATM2 bye

[Evgeni57]

I tried, but there is still now voice :(

[Rajesh Anuhya]

try this below

serialPort1.Write("ATDmyphone;\r");

put ";" after your phone number

Rajesh B --> A Poor Workman Blames His Tools <--

[Evgeni57]

AFAIK, ';' tells the modem to return to return to command mode after the phone was dialed. How this may help? I tried it, but still there is no sound :( Thanks for your advice.

[Rajesh Anuhya]

Then.., that is very difficult to solve your problem by us, you have to debug the dialer software that which "AT" commands are sending to the modem, Use a Serial Port Monitor to see the AT commands are sending by the dialer software.., download the serial monitor from the following link http://www.hhdsoftware.com/products/[^] Thanks & Regards

Rajesh B --> A Poor Workman Blames His Tools <--

[Chuck Richards]

Did you ever resolve this? What modem type are you using?