gsm at commands

7/31/2019 GSM at Commands

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GSM module

BRiCS 1


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PIN outs

BRiCS 2


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USART

BRiCS 3

Asynchronous or Synchronous Operation

Master or Slave Clocked Synchronous Operation

High Resolution Baud Rate Generator

Supports Serial Frames with 5, 6, 7, 8, or 9 Data Bits and 1 or 2 Stop Bits

Odd or Even Parity Generation and Parity Check Supported by Hardware

Three Separate Interrupts on TX Complete, TX Data Register Empty,

and RX Complete

Double Speed Asynchronous Communication Mode


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Software

X-CTU

X-CTU allows to communicate with the device using the technology UART that is a

communication protocol ,Through which we can communicate from our PC t0 several

devices.

Which also allow you for different setting for different devices

It also language transparency with hex code, user are allowed to write there code in

hex.

It can detect the compactable devices through which it can communicate

BRiCS 4


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GSM AT Commands

Command line

Commands always start with AT and finish with a character

(0x0D)

Information responses and result code

_ If command syntax is incorrect, an ERRORstring is returned.

_ If command syntax is correct but with some incorrectparameters, the +CME ERROR:or +CMS ERROR : strings are returned with different errorcodes._ If the command line has been performed successfully, an OK

string is returned. BRiCS 5


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GSM AT Commands

SIM Insertion, SIM RemovalThe AT+CPIN? command delivers the followingresponses:

If the SIM detect pin indicates absent, the response toAT+CPIN? is +CME ERROR 10

If the SIM detect pin indicates present, and the insertedCard is a SIM Card, the responseto AT+CPIN? is +CPIN: xxx depending on SIM PIN state.

BRiCS 6


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GENERAL COMMANDS

Command syntax: AT+CGMI

This command gives the manufacturer identification

Command syntax: AT+CGSNThis command allows the user application to get the IMEI

Command syntax: AT+ECHO?0: Deactivate Echo1:Activate Echo

Command syntax: AT+ECHO=This allows us to keep change in the activation andd deactivation of command

Signal Quality +CSQCommand syntax: AT+CSQ+CSQ: ,:31: -51dBm or greater99: not known or not detectable

: 07: as RXQUAL values in the table GSMBRiCS 7


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GENERAL COMMANDS

Command syntax: AT+CMGSThis command allow you to send messages

Command syntax: AT+CMGR

This command allows the user to read the messages

Command syntax: AT+CMGDThis command allows the user to delete the messages

Dial command D

The ATD command sets a voice, data or fax call. As per GSM Module, the dialcommand also controls supplementary services.

Command syntax: ATD where is the destination phone number.

BRiCS 8


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GSM Module

Specifications

GSM MODEM SIM 300 WITH SIM CARD HOLDER ,

ANTENNA

AND RS232 INTERFACE .

GSM/ GPRS MODEM Using SIMCOM-300

Module.

RS 232 Interface. DB9 port.

On Board Voltage regulator.

Power / Signal LED Indication.

SMA Connector for antenna connection.BRiCS 9


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Hardware

Description about the whole communication

BRiCS 10


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RS-232.

The RS-232 interface has common ground between the DTE and DCE

MAX233 performs the same job as MAX232 but eliminates the need for

capacitors

o A line driver such as the MAX232 chip is required to convert RS232 voltage

levels to TTL levels, and vice versa In RS232, a 1 is represented by -3 ~ -25 V, while a 0 bit is +3 ~ +25 V, making -3

+3 undefined

Those two pins are calle TxD and RxD and these pins are TTL compatible;

therefore, they require a line driver to make them RS232 compatible

BRiCS 11

gsm at commands

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