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I am using Prolink PSH300 HSUPA GSM Modem connect to my laptop and using tera term to test the connect.

First I entered AT it will response me OK

AT OK

AT+CMGF=1 OK

AT+CMGS="+6581XXXXXX" (then I pressed enter error was returned) ERROR

Sometime it won't return me error but just hang there no > return.

Could anybody advise me what to do?

user236501
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    Try sending `AT+CMEE=1` before the `CMGS`. This enables informative error messages (if supported), so you should get something more useful than `ERROR`. – nneonneo Aug 26 '12 at 04:26
  • Actually I did it too, but it just return me error with any error code, sometime it just hang there without any response, but when I typed at then OK return. – user236501 Aug 26 '12 at 04:37

3 Answers3

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In your port initialization I would suggest you add these two lines-

port.DiscardOutBuffer(); 
port.DiscardInBuffer();

These will do a PurgeComm native WIN32 call, that will be resetting the hardware flow control lines.

Also add DtrEnable/RtsEnable = true lines to before opening the port connection.

Shiridish
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Scenario: My nokia mobile conected to pc over bluetooth link. commands: at (result ok), at+Cmgf=1(ok), but at+cmgs="mob.no">"hello"ctrl+z (result +cms error 500). I solved it by making a small change to extra initialisation setting in bluetooth modem. How, i explain here. conrol panel -> phone and modem -> selected the blue tooth modem -> click properties. In the dialog window that opens goto advance tabs and change the existing extra initialisation commands: from whatever existed to any of the following as mentioned in the website below: cksaheb.blogspot.in/2011/03/extra-initialization-command-for-gprs.html. My problem for sending sms solved.

Vrk
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I have the same problem. you must check antena connection. Your GSM can't fine the network.

user5785784
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