"2022官方最新SIM900_AT指令手册V1.11详解"

需积分: 12 87 浏览量更新于2024-03-13 收藏 1.55MB PDF 举报

The SIM900 AT Commands Manual V1.11 is a comprehensive guide provided by SIMCom to assist customers in understanding and utilizing the features of the SIM900 module. This manual, which consists of 271 pages, contains detailed information on various AT commands that can be used to communicate with the SIM900 module. The manual is designed to help users make smart decisions when developing applications that involve the SIM900 module. It covers a wide range of topics, including setting up the module, sending and receiving messages, making calls, accessing the internet, and configuring various parameters. With a release date of 2015-01-12, this manual provides up-to-date information on the features and capabilities of the SIM900 module. It is intended to be a valuable resource for engineers and developers who are working on projects that incorporate the SIM900 module. Overall, the SIM900 AT Commands Manual V1.11 serves as a comprehensive and detailed guide for users looking to harness the full potential of the SIM900 module in their applications. It provides the necessary information and instructions to help users effectively communicate with the module and make informed decisions throughout the development process.

Smart Machine Smart Decision

SIM900_AT Commands Manual_V1.11 16 2014.10.20

The AT Command set implemented by SIM900 is a combination of GSM07.05, GSM07.07 and

ITU-T recommendation V.25ter and the AT commands developed by SIMCom.

Note: A HEX string such as "00 49 49 49 49 FF FF FF FF" will be sent out through serial

port at the baud rate of 115200 immediately after SIM900 is powered on. The string shall be

ignored since it is used for synchronization with PC tool. Only enter AT Command through

serial port after SIM900 is powered on and Unsolicited Result Code "RDY" is received from

serial port. If auto-bauding is enabled, the Unsolicited Result Codes "RDY" and so on are

not indicated when you start up the ME, and the "AT" prefix, not "at" prefix must be set at

the beginning of each command line.

All these AT commands can be split into three categories syntactically: "basic", "S parameter",

and "extended". These are as follows:

1.4.1 Basic syntax

These AT commands have the format of "AT<x><n>", or "AT&<x><n>", where "<x>"is the

Command, and "<n>"is/are the argument(s) for that Command. An example of this is "ATE<n>",

which tells the DCE whether received characters should be echoed back to the DTE according to

the value of "<n>". "<n>" is optional and a default will be used if missing.

1.4.2 S Parameter syntax

These AT commands have the format of "ATS<n>=<m>", where "<n>" is the index of the S

default value is assigned.

1.4.3 Extended Syntax

These commands can operate in several modes, as in the following table:

Table 1: Types of AT commands and responses

Test Command AT+ <x>=? The mobile equipment returns the list of parameters

and value ranges set with the corresponding Write

Command or by internal processes.

Read Command AT+ <x>? This command returns the currently set value of the

parameter or parameters.

Write Command AT+ <x >=< …> This command sets the user-definable parameter

values.

Execution Command AT+ <x > The execution command reads non-variable

parameters affected by internal processes in the GSM

engine.

Smart Machine Smart Decision

SIM900_AT Commands Manual_V1.11 17 2014.10.20

1.4.4 Combining AT commands on the same Command line

You can enter several AT commands on the same line. In this case, you do not need to type the

"AT" or "at" prefix before every command. Instead, you only need type "AT" or "at" the

beginning of the command line. Please note to use a semicolon as the command delimiter after an

extended command; in basic syntax or S parameter syntax, the semicolon need not enter, for

example: ATE1Q0S0=1S3=13V1X4+IFC=0,0;+IPR=115200; &W.

The Command line buffer can accept a maximum of 556 characters. If the characters entered

exceeded this number then none of the Command will executed and TA will return "ERROR".

1.4.5 Entering successive AT commands on separate lines

When you need to enter a series of AT commands on separate lines, please Note that you need to

wait the final response (for example OK, CME error, CMS error) of last AT Command you entered

before you enter the next AT Command.

1.5 Supported character sets

The SIM900 AT Command interface defaults to the IRA character set. The SIM900 supports the

following character sets:

x GSM format

x UCS2

x HEX

x IRA

x PCCP

x PCDN

x 8859-1

The character set can be set and interrogated using the "AT+CSCS" Command (GSM 07.07).

The character set is defined in GSM specification 07.05.

The character set affects transmission and reception of SMS and SMS Cell Broadcast messages,

the entry and display of phone book entries text field and SIM Application Toolkit alpha strings.

1.6 Flow control

Flow control is very important for correct communication between the GSM engine and DTE. For

in the case such as a data or fax call, the sending device is transferring data faster than the

receiving side is ready to accept. When the receiving buffer reaches its capacity, the receiving

device should be capable to cause the sending device to pause until it catches up.

There are basically two approaches to achieve data flow control: software flow control and

hardware flow control. SIM900 support both two kinds of flow control.

In Multiplex mode, it is recommended to use the hardware flow control.

剩余270页未读，继续阅读

不写博客

粉丝: 5
资源: 3

"2022官方最新SIM900_AT指令手册V1.11详解"

SIM900的AT命令，和TCP/IP命令详解

SIM900A AT指令手册

SIM900A_AT命令手册【中文版】

【2022年官方最全最终版】SIM900_AT指令手册_V1.11.pdf

SIM7100_硬件设计手册_V1.11.pdf

SIM900A_AT_V1.02.zip_sim900A _sim900A_AT_sim900a AT_sim900a AT_

【2022官方最新】SIM900_硬件设计手册_2.05.pdf

SIM900_AT_Command_Manual_V1.03.rar_通讯编程_PDF_

SIM800 Series_AT Command Manual_V1.10.zip_AT指令_SIM800_SIM800系列模块

SIMCOM_SIM7600_AT_V1.01.rar_SIMCOM7600 STM32_gsm RACH超时_sim7600_

最新资源