Specifications

SIM900 AT Command Manual
SIM900_AT Command Manual_V1.03 4 12/24/2010
Contents
1 Introduction..................................................................................................................................11
1.1 Scope of the document.......................................................................................................... 11
1.2 Related documents ................................................................................................................ 11
1.3 Conventions and abbreviations .............................................................................................12
1.4 AT Command syntax.............................................................................................................12
1.4.1 Basic syntax ...................................................................................................................12
1.4.2 S Parameter syntax.........................................................................................................13
1.4.3 Extended Syntax.............................................................................................................13
1.4.4 Combining AT commands on the same Command line.................................................13
1.4.5 Entering successive AT commands on separate lines.....................................................13
1.5 Supported character sets........................................................................................................13
1.6 Flow control ..........................................................................................................................14
1.6.1 Software flow control (XON/XOFF flow control).........................................................14
1.6.2 Hardware flow control (RTS/CTS flow control)............................................................15
2 AT Commands According to V.25TER.......................................................................................16
2.1 Overview of AT Commands According to V.25TER ............................................................16
2.2 Detailed Description of AT Commands According to V.25TER ...........................................17
2.2.1 A/ Re-issues the Last Command Given.......................................................................17
2.2.2 ATA ANSWER AN INCOMING CALL ....................................................................17
2.2.3 ATD Mobile Originated Call to Dial A Number..........................................................18
2.2.4 ATD><n> Originate Call to Phone Number in Current Memory................................20
2.2.5 ATD><str> Originate Call to Phone Number in Memory Which Corresponds to Field
<str> ........................................................................................................................................21
2.2.6 ATDL Redial Last Telephone Number Used...............................................................23
2.2.7 ATE Set Command Echo Mode ..................................................................................23
2.2.8 ATH Disconnect Existing Connection.........................................................................24
2.2.9 ATI Display Product Identification Information .........................................................25
2.2.10 ATL Set Monitor speaker loudness............................................................................25
2.2.11 ATM Set Monitor Speaker Mode ..............................................................................25
2.2.12 +++ Switch from Data Mode or PPP Online Mode to Command Mode ..................25
2.2.13 ATO Switch from Command Mode to Data Mode....................................................26
2.2.14 ATP Select Pulse Dialling..........................................................................................26
2.2.15 ATQ Set Result Code Presentation Mode..................................................................26
2.2.16 ATS0 Set Number of Rings before Automatically Answering the Call.....................27
2.2.17 ATS3 Set Command Line Termination Character .....................................................27
2.2.18 ATS4 Set Response Formatting Character ................................................................28
2.2.19 ATS5 Set Command Line Editing Character.............................................................28
2.2.20 ATS6 Pause Before Blind Dialling............................................................................29
2.2.21 ATS7 Set Number of Seconds to Wait for Connection Completion..........................29
2.2.22 ATS8 Set Number of Seconds to Wait for Comma Dial Modifier Encountered in Dial
String of D Command .............................................................................................................30
2.2.23 ATS10 Set Disconnect Delay after Indicating the Absence of Data Carrier..............30