Data Sheet

SIM900 AT Commands Set
SIM900R01_ATC_V1.00 4 15.01.2010
Contents
Version History .................................................................................................................................3
1 Introduction..................................................................................................................................10
1.1 Scope of the document..........................................................................................................10
1.2 Related documents ................................................................................................................10
1.3 Conventions and abbreviations .............................................................................................11
1.4 AT Command syntax .............................................................................................................11
1.4.1 Basic syntax ................................................................................................................... 11
1.4.2 S Parameter syntax.........................................................................................................12
1.4.3 Extended Syntax.............................................................................................................12
1.4.4 Combining AT commands on the same Command line.................................................12
1.4.5 Entering successive AT commands on separate lines.....................................................12
1.5 Supported character sets........................................................................................................12
1.6 Flow control ..........................................................................................................................13
1.6.1 Software flow control (XON/XOFF flow control).........................................................13
1.6.2 Hardware flow control (RTS/CTS flow control)............................................................14
2 ...................................................................................15 AT Commands According to V.25TER
2.1 Overview of AT Commands According to V.25TER ............................................................15
2.2 Detailed Description of AT Commands According to V.25TER ...........................................16
2.2.1 A/ Re-issues The Last Command Given ........................................................................16
2.2.2 ATA ANSWER AN INCOMING CALL .......................................................................16
2.2.3 ATD Mobile Originated Call To Dial A Number............................................................17
2.2.4 ATDL Redial Last Telephone Number Used..................................................................23
2.2.5 ATE Set Command Echo Mode .....................................................................................24
2.2.6 ATH Hang up a call........................................................................................................24
2.2.7 ATI Display Product Identification Information ............................................................25
2.2.8 ATL Monitor speaker loudness.......................................................................................25
2.2.9 ATM Monitor Speaker Mode .........................................................................................26
2.2.10 +++ Switch From Data Mode Or PPP Online Mode To Command Mode...................26
2.2.11 ATO Switch From Command Mode To Data Mode.....................................................26
2.2.12 ATP Select Pulse Dialing..............................................................................................27
2.2.13 ATQ Set Result Code Presentation Mode.....................................................................27
2.2.14 ATS0 Set Number Of Rings Before Automatically Answering The Call.....................28
2.2.15 ATS3 Set Command Line Termination Character ........................................................28
2.2.16 ATS4 Set Response Formatting Character ...................................................................28
2.2.17 ATS5 Set Command Line Editing Character................................................................29
2.2.18 ATS6 Set Pause Before Blind Dialing..........................................................................29
2.2.19 ATS7 Set Number Of Seconds To Wait For Connection Completion ..........................30
ATS7 Set Number Of Seconds To Wait For Connection Completion.....................................30
2.2.20 ATS8 Set Number Of Second To Wait For Comma Dial Modifier Encountered In Dial
String Of D Command ............................................................................................................30
2.2.21 ATS10 Set Disconnect Delay After Indicating The Absence Of Data Carrier .............31
2.2.22 ATT Select Tone Dialing ..............................................................................................31