Using at Commands

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USING AT-Commandsin HYPERTERMINAL and in

PROGRAMMING languages “AT” stands for “attention commands” and are great way

to interface with your GSM based mobile for variety forenhancing operations. PC connection with the mobile is

required which can be done using data cable or Bluetoothconnectivity

PREPARED BY: UMER FAROOQCENTRE FOR ADVANCED STUDIES IN ENGINEERING



AT-COMMANDS

This document contains some commonlyused AT Commands. For there

functionality please refer to the ATCOMMANDS reference guide for moredetails.



CHECKING SUPPORTEDCOMMANDS

AT◦ Returns all the AT-COMMANDS which are

supported by the attached phone

◦ USAGE: AT



DIAL COMMAND

ATD◦ Calls a number through your phone

◦ USAGE: ATD “+92345xxxxxx”;

◦DON’T FORGET THE COLON AT THEEND.



ATTENDING A CALL

ATA◦ If there is incoming call, on using this

command, the call is attending.

◦ USAGE: ATA



HANGING UP THE CURRENT CALL

AT+CHUP◦ Hang up the ongoing call

◦ USAGE: AT+CHUP



BATTERY CHARGE

AT+CBC◦ Returns Battery Charging Status and charged

amount

◦ USAGE: AT+CBC=?

◦ RETURNS:

◦ +CBC <CHARGING STATUS> <CHARGING AMOUNT>

◦ FOR COMPLETE DETAILS, VIEW THEREFERENCE MANUAL



SIGNAL STRENGTH

AT+CSQ◦ Gives the signal strength of the cell at that

point

◦ USAGE: AT+CSQ=?

◦ RETURNS

+CSQ <Signal Strength>

FOR COMPLETE DETAILS, VIEW THEREFERENCE MANUAL



PHONEBOOK COMMANDS

AT+CPBS◦ Sets the phonebook storage (SIM/PHONE MEM)

◦ USAGE: AT+CPBS=<storage mode> AT+CPBR

◦ Returns the phonebook entry with given index

◦ USAGE:AT+CPBR=<index>

AT+CPBF◦ Search phonebook with given name

◦ USAGE:AT+CPBF=<text>

AT+CPBW

◦ Writes the phonebook◦ USAGE:AT+CPBW=<index>, <number> <text>



GETTING MOBILE SPECIFICATION

AT+CGMI◦ Request Manufacturer Identification

◦ USAGE: AT+CGMI=?

AT+CGMM or AT+GMM◦ Request Model Identification

◦ USAGE: AT+CGMM=? Or AT+GMM=?

AT+CGSN◦ Request IMEI number

◦ USAGE: AT+CGSN=?



MESSAGING FORMAT

AT+CMGF◦ Sets the message format (0-PDU, 1-TEXT)

◦ SAMSUNG AND MOTROLLA MOBILE SUPPORTSTEXT AND PDU

◦ OTHER MOBILE PHONES ONLY SUPPORTS PDUMODE. (Requires some hard work to send a

message if you are building your ownapplication

◦ USAGE: AT+CMGF=<0-1>



MESSAGE READ

AT+CMGR◦ Read the message placed at the given index

◦ USAGE: AT+CMGR=<index>

◦ RETURNS: The message is in text format if CMGF was set to 1 otherwise you will se someencoded TEXT in PDU. Its still a message. You

have to decode it first to understand it.

◦ Supports READ, UNREAD, SENT, UNSENT andTEMPLATE messages.



SERVICE CENTRE NUMBER

AT+CSCA◦ Sets the SERVICE CENTRE NUMBER

◦ USAGE: AT+CSCA=“+923455000010”

◦ AT+CSCA=?

◦ Returns the current SC number



SENDS A MESSAGE

AT+CMGS

Sends the current messagee

USAGE (TEXT ONLY):

AT+CMGS=“+92345123456”, <ENTER>

<hi this is a test> <CTRL-Z/ESC>



WHAT IS <CR> and <LF>

<CR> stands for ENTER KEY

<LF> stands for CTRL-Z/ESC key

In the reference manual, you mayencounter these terms which are difficult

to understand while reading thedocument. Now it is easy for you.



SOME MORE COMMANDS

AT*CPI (Call progress information)

AT+CCWA (Enable Call waiting)

AT*EDIF (Call diverting)

AT+CPWD (Change Password)

AT+CPAS (Shows all phone activity)

AT+CMAR (Master Reset) AT+CLAN (Changing Language)

AT*EKEY (Keypad Control)



AND AGAIN SOME MORECOMMANDS

AT+CCLK (Returns time in mobile)

AT+CALA (Alarm Setting)

AT+CALD (Alarm Delete)

AT*SEDISKL (Disable Keypad)

AT+CSIL (Silent on off)

FOR USAGE OF THESE COMMANDS, referto the reference manual.



AT COMMANDS

As we say from the commands, it is veryeasy to use these commands. You can

enhance your software (which ever thelanguage is used).



TESTING COMMANDS INHYPERTERMINAL

Before you actually start using ATCommands, make sure you check these

commands in hyperterminal which is verysimple to use.



STEPS OF USING HYPERTERMINAL

1. Run hyperterminal located inaccessories.

2. Name the connection.3. Select the COM port to which your

mobile is connected. If you are not sure,

keep testing the commands inhyperterminal. If any work, you foundthe COM port.

4. Keep clicking OK



FURTHER STEPS

You will see a text editor.

Write ATD “000”;

If your mobile phone dials the number.You are connected to it.

Use different commands and check the

return value. The return value is the same which is

returned when you use these commandsin any programming language.



USING AT COMMANDS INLANGUAGE

In almost all Visual Languages like VB 6,VB.NET, VC++, VC++.NET, C#.NET, there

is a tool called SERIAL PORT. You may have to see programming

language manual or concern MSDN formore details on how to use SERIAL PORTCOMPONENT.



FOOLISH ASSUMTIONS

YOU KNOW ONE OF THE VISUALLANGUAGE

YOU KNOW HOW TO USE SERIAL PORT YOU ARE FAMILIAR WITH EVENTS,

METHODS, PROPERTIES

BUT YOU DON’T KNOW HOW TO USE ATCOMMANDS IN THE LANGUAGE



SOME MORE FOOLISHASSUMTIONS

I am considering that your programminglanguage SERIAL PORT COMPONENT has

the following methods

Write(string) Writes the string to port

ReadExisting()

Reads everything on port



FINALLY USING AT COMMANDS

To use any AT Command, make sure youare connected to the serial port.

Serialport.write(“AT+CSIL = 1”);

Simple isnt it??



DATA RECEIVE EVENT

When you write/send the command to theport or you can say your cell, your Cell

also returns something (likehyperterminal returns you. Infact itreturns the same as hyperterminalreturns you)

The DATA RECEIVED EVENT of SERIALPORT COMPONENT can be used to retrievethe RETURN VALUE.



DATA RECEIVE EVENT

This is how to use it with assumptionsthat “serialport” is the name of

component where as “data” is a globalSTRING VARIABLE.

Public data_recieved(blah blah)

{

Data = serialport.readexisting();

}



TIP: USE PARSING

Parse the return value as required by you.Don’t show all the return value to the user

using your software. Offcouse!!

WHY WOULD A MAGICIAN

REVEAL HIS SECRETS!!!!



THAT’S ALL

I hope I provided you all the basics youneed in order to use the AT-COMMANDS in

programming languages, in HyperTerminaland off course gave some AT-COMMANDSto enhance your knowledge.

So what are you waiting for,

GET STARTED NOW



USING AT-Commandsin HYPERTERMINAL and inPROGRAMMING languages

THANKS

PREPARED BY: UMER FAROOQCENTRE FOR ADVANCED STUDIES

IN ENGINEERING

Using at Commands

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