Specifications

Smart Machine Smart Decision
SIM900_AT Commands Manual_V1.07 5 2012.12.10
Contents
Version History .................................................................................................................................3
Contents ............................................................................................................................................5
1 Introduction..................................................................................................................................13
1.1 Scope of the document..........................................................................................................13
1.2 Related documents ................................................................................................................13
1.3 Conventions and abbreviations .............................................................................................14
1.4 AT Command syntax.............................................................................................................14
1.4.1 Basic syntax ...................................................................................................................14
1.4.2 S Parameter syntax.........................................................................................................15
1.4.3 Extended Syntax.............................................................................................................15
1.4.4 Combining AT commands on the same Command line.................................................15
1.4.5 Entering successive AT commands on separate lines.....................................................15
1.5 Supported character sets........................................................................................................16
1.6 Flow control ..........................................................................................................................16
1.6.1 Software flow control (XON/XOFF flow control).........................................................16
1.6.2 Hardware flow control (RTS/CTS flow control)............................................................17
2 AT Commands According to V.25TER.......................................................................................18
2.1 Overview of AT Commands According to V.25TER ............................................................18
2.2 Detailed Description of AT Commands According to V.25TER ...........................................19
2.2.1 A/ Re-issues the Last Command Given.......................................................................19
2.2.2 ATA Answer an Incoming Call....................................................................................19
2.2.3 ATD Mobile Originated Call to Dial A Number..........................................................20
2.2.4 ATD><n> Originate Call to Phone Number in Current Memory................................22
2.2.5 ATD><str> Originate Call to Phone Number in Memory Which Corresponds to Field
<str> ........................................................................................................................................23
2.2.6 ATDL Redial Last Telephone Number Used...............................................................24
2.2.7 ATE Set Command Echo Mode ..................................................................................25
2.2.8 ATH Disconnect Existing Connection.........................................................................26
2.2.9 ATI Display Product Identification Information .........................................................26
2.2.10 ATL Set Monitor speaker loudness............................................................................27
2.2.11 ATM Set Monitor Speaker Mode ..............................................................................27
2.2.12 +++ Switch from Data Mode or PPP Online Mode to Command Mode ..................27
2.2.13 ATO Switch from Command Mode to Data Mode....................................................28
2.2.14 ATP Select Pulse Dialling..........................................................................................28
2.2.15 ATQ Set Result Code Presentation Mode..................................................................28
2.2.16 ATS0 Set Number of Rings before Automatically Answering the Call.....................29
2.2.17 ATS3 Set Command Line Termination Character .....................................................29
2.2.18 ATS4 Set Response Formatting Character ................................................................30
2.2.19 ATS5 Set Command Line Editing Character.............................................................30