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Chapter 2 – AT Commands Overview
Command Types
Terminology Used to Describe AT Command Communication
Term
AT Command
Result Code
Extended Reason Code
Response
Unsolicited Response
Definition
This is referred to as a command from the host application to modem with a
request to perform a service.
This is an immediate response to a command, informing the host application
whether the execution of the command succeeded or failed. The strings “OK” or
“ERROR” are the only two Result Codes available. A result code is always
returned after an AT command has been sent to the modem.
If enabled, (see AT+CMEE), modem responds with a detailed reason code string
in addition to “OK” or “ERROR”. The reason code is returned before the result
code. Extended reason codes are only provided when the result code is ERROR.
A response contains data that has been requested via an AT command. A
response is returned before the result code of the command. A response is
provided only when the result code is OK.
An unsolicited response is sent by modem when a specific event occurs. Some
unsolicited responses can be turned on and off via AT commands. Some
unsolicited responses are always enabled or turned on.
Three Types of AT Commands
Command Type
Action Command
Read Command
Test Command
Definition
Action commands are used to perform a function. Typically, action commands are used
to change the value of a setting in modem, send data, or perform advanced queries that
require input data.
Read commands typically end with a “?”. Most read commands do not have any input
parameters; however, in some cases an input parameter provides options for the
response format. The read commands are used for reading values of certain settings in
the modem.
Test commands are not supported in the C1 modem.
Command Format and Syntax
Alphabet
The T.50 International Alphabet 5 (IA5) is used in this manual. Only the low-order seven bits of each character
are significant to modem. Any eighth or higher-order bit(s) are ignored for the purpose of identifying commands
and parameters. Lower-case characters (IA5 values from 0x61 to 0x7A) are considered identical to their upper-
case equivalents (IA5 values from 0x41 to 0x5A) when received by modem from the host application. Result
codes from the modem shall be in upper case.
All commands must begin with the characters A and T. If the A and T are not received by the software, the
remaining characters will not be processed. This is important; should the A or T be lost in communication or not
supplied, none of the characters sent to the modem will be echoed back until an AT sequence is observed.
Command-Line Editing
The character defined by the command ATS5 in chapter 9.14, (default: backspace [IA5 0x08]) is intended to be
interpreted as a request from the host application to the modem to delete the previous character.
Any control characters (IA5 0x00 through 0x1F, inclusive) that remain in the command line after receipt of the
termination character are ignored by the modem.
Before checking for other characters, the modem checks characters from the host application to see if they match
the termination character (S3), then it checks to see if they match the editing character (S5). This ensures that
these characters will be properly recognized even if they are set to values that the modem uses for other
purposes. If S3 and S5 are set to the same value, a matching character will be treated as matching S3 (S3 is
checked before S5).
Multi-Tech Systems, Inc. CDMA C1 AT Commands Reference Guide (PN S000478C)
9
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功能描述:MODEM CELLULAR RS232 DUAL CDMA RoHS:是 类别:RF/IF 和 RFID >> RF 接收器、发射器及收发器的成品装置 系列:MultiModem® Cell 标准包装:5 系列:MultiModem® iCell 功能:收发器，HSPA，调制解调器 调制或协议:GPRS，GSM，EDGE 频率:850MHz，900MHz，1.8GHz，1.9GHz 应用:- 接口:RS-232，USB 灵敏度:- 功率 - 输出:- 数据传输率 - 最大:7.2 Mbps 特点:- 电源电压:9 V ~ 32 V，USB 其它名称:881-1125
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功能描述:MODEM CDMA USB 800MHZ 1.9GHZ RoHS:是 类别:RF/IF 和 RFID >> RF 接收器、发射器及收发器的成品装置 系列:MultiModem® Cell 标准包装:5 系列:MultiModem® iCell 功能:收发器，HSPA，调制解调器 调制或协议:GPRS，GSM，EDGE 频率:850MHz，900MHz，1.8GHz，1.9GHz 应用:- 接口:RS-232，USB 灵敏度:- 功率 - 输出:- 数据传输率 - 最大:7.2 Mbps 特点:- 电源电压:9 V ~ 32 V，USB 其它名称:881-1125
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制造商:Multi-Tech Systems 功能描述:CDMA,800/1900MHZ(BM)(BT)