How to send SMS by GSM modem in PDU mode?

Question

I want to send SMSs in PDU mode. I have checked the spec for my modem, and it supports PDU mode.

I have developed a PDU encoder and decoder, but now I do not know

Answer 1

First of all, to send sms when modem is in pdu mode, you must send these commands: AT+CMGS= , where length is (length of PDU binary string - 2) / 2. When '>' symbol appears you must send your pdu and ctrl+z character (char.ConvertFromUtf32(26)).

Here are some resources that may be useful: http://www.developershome.com/sms/ SMS Tutorial http://www.diafaan.com/sms-tutorials/gsm-modem-tutorial/online-sms-deliver-pdu-decoder/ another online pdu decoder (but your link is better in my opinion) http://www.fccps.cz/img.asp?attid=24590 AT commands guide (for wavecom, but there is no difference)

Last advice - use any telnet client to connect and test your modem and see how it responds