
Table of Contents
Multi-Tech Systems, Inc. AT Commands for Wireless Modems with IP Connectivity (S000333D) 5
#VVERSION Display Software Version .....................................................................................................................39
#VSTATE Display Current Status ..............................................................................................................................39
#VALL Display All Parameters...................................................................................................................................39
#DELFLASH Erase Flash Memory Parameter Values...............................................................................................41
Chapter 9 - Response Messages and Error Codes ........................................................................................................42
Response Messages ...................................................................................................................................................42
Error Codes..................................................................................................................................................................42
Appendix A – Getting Started Examples.........................................................................................................................44
AT+WOPEN Start TCP/IP Stack................................................................................................................................44
AT#VVERSION Get Software Version........................................................................................................................44
AT#PPPMODE Set Parameter Value ..........................................................................................................................44
AT+CPIN GSM Network Registration .........................................................................................................................44
AT+CGREG GSPRS Network Registration State.......................................................................................................44
Connect to the Internet ................................................................................................................................................45
Sending/Retrieving Email.............................................................................................................................................46
FTP: Download / Upload Files .....................................................................................................................................47
TCP Socket..................................................................................................................................................................48
Appendix B – Detailed Examples.....................................................................................................................................49
Serial Communication...................................................................................................................................................49
Configuring the TCP/IP Stack through the Serial Port...............................................................................................53
Configuring Flow Control over the Serial Port ...........................................................................................................54
Using the DNS Service..................................................................................................................................................54
Connecting to an Internet Service Provider (ISP) through GSM Data ......................................................................55
Using the TCP/IP Stack as a PPP Server in GSM Mode.............................................................................................57
Automatic Call-Back to Incoming Calls.......................................................................................................................58
Automatic Answer of Incoming Calls..........................................................................................................................60
Answering an Incoming Call ........................................................................................................................................62
Connecting to the Internet through GPRS..................................................................................................................64
Retrieving Email ............................................................................................................................................................66
Sending an Email Containing Data from the Serial Port............................................................................................68
Sending a Pre-Defined Email Combination.................................................................................................................71
Downloading an FTP File..............................................................................................................................................73
Uploading an FTP File...................................................................................................................................................75
Setting a TCP Port to a Listening Mode ......................................................................................................................77
Opening a TCP Socket..................................................................................................................................................78
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