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i am using AT commands to test sending sms messages from pc to mobile. i have been referring to the following links:

http://www.smssolutions.net/tutorials/gsm/sendsmsat/ http://www.developershome.com/sms/howToSendSMSFromPC.asp

when i press ctrl+z, nothing happens. No matter how long i wait, it just shows a blinking cursor like this. Ideally after a few seconds, it must display +CMGS: 62 if sms is send properly.

could anyone point out what might be wrong?

enter image description here

Armand
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newbee
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  • What do you get when you enter at+cscs? – user1725145 Mar 08 '13 at 09:48
  • @SList I get AT OK +CSCS: "PCCP437" OK – newbee Mar 08 '13 at 10:05
  • Try changing it to "IRA" or "GSM" (assuming that AT+CSCS=? supports these values)? You should see a little arrow for Ctrl-Z, by the way. – user1725145 Mar 08 '13 at 10:08
  • @SList AT+CSCS="IRA" or AT+CSCS="GSM" gives me a CME ERROR:4 which means this operation is not allowed. It supports only PCCP437 – newbee Mar 08 '13 at 10:13
  • @SList do u happen to know what does PCCP437 mean here? – newbee Mar 08 '13 at 10:15
  • It's a character coding scheme. If you do AT+CSCS=?, you should get a list of the types of character coding supported by your modem. Mine supports IRA, GSM and UCS2, but I can only send SMSs by entering text like you do above with IRA and GSM. Not sure why it doesn't work for UCS2. – user1725145 Mar 08 '13 at 10:17
  • also, please note: i have connected my phone to my computer to use as a gsm modem.and i am sending a message to my phone itself. till the time my phone was connected to my pc, nothing happened. but when i disconnected my phone, i received the message 'Hello!1".. so does that mean that it is because i am basically sending msg from my my phone to my phone, it does not accept ctrl+z?? – newbee Mar 08 '13 at 10:20
  • Here's the standard definition of AT commands from 3GPP (the standards body for UMTS): http://www.3gpp.org/ftp/Specs/html-info/27005.htm – user1725145 Mar 08 '13 at 10:20
  • @SList Ohh thanks for that. my phone only supports PCCP437. thats what it shows. – newbee Mar 08 '13 at 10:22
  • It shouldn't make a difference that it was to your own phone, but you can easily test that by sending to someone else's phone. I guess you didn't see the message while your phone was connected, because it wasn't in phone mode? – user1725145 Mar 08 '13 at 10:22
  • @SList the message goes out only on disconnecting my phone. and thats why i dont get the confirmation +cmgs: 62 on pressing ctrl+z – newbee Mar 08 '13 at 10:34
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    OK, so it seems that your phone is not very good at being a modem :-) – user1725145 Mar 08 '13 at 10:42

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