AT Commands
Contents |
Warning
This information is only partial. Typing commands as they are represented here may result in obscure error messages. Additionally, not all Nokia phones understand all the commands on this page, or reply in a meaningful way. Firmware on some phones is broken. Do not expect the documentation to match reality. See comments.
Overview
AT commands are known by Hayes AT commands. There are different views to understand the meanings of "AT". Some people call it as "Attention Telephone" or some people call it as "Attention Terminal" commands. Views can be different but meanings are same. We are after all going to give some instruction to phone either it is mobile phone or a normal landline telephone. Basically the commands work on Modem. We can also send some of the commands to our PC's modem also. If we are sending commands to GSM mobile phones of Nokia they may differ by manufacturer to manufacturer. Major AT commands are same some of them are different. Mobile manufacturer also gives attention to operators to allow or not to allow some commands on the phone. Let us see in brief what is the use of such commands. We can perform some of the operation which we do from mobile keypad like calling a number, sending an sms, reading an SMS, deleting an SMS, setting the SMSC number, looking for GPRS access point, reading phonebook data, deleting phonebook data, reading the battery status, reading the signal strength etc. When we want to make a PC based application to interface a mobile phone using USB, IR or bluetooth such commands are needed to communicate with mobile phones. Basically such commands are application layer of MBUS or FBUS commands. Nokia provides an AT command set guide by which we can refer the basic command syntax and the response of the command in various situations.
Let us see now how to use this commands. The AT commands work on all the devices but you have to check out whether it has in built GSM modem or not, if it exists then there is no need of virtual modem software to install in your PC. But if you are using very older Nokia Phones you have to find out the DATA suite not the PC Suite for such phones (Nokia 5110) to use AT commands. We focus on the mobile phones which has built-in GSM modem. The user can configure the PC to use it within a minute.
First connect your mobile phone with PC using any available option (BT, USB or IR). Check whether you have installed the proper driver from Nokia website for the GSM modem or not, if it is not installed download it first for you device. Now next step is to open the hyper terminal - a communication utility in your window OS. You can find the hyper terminal in start>programs>accessories>communication. Open it and create one new connection set some of the parameters like baud rate (normally 9600), handshaking mode (Xon-Xoff), parity bit (default) etc. Select the communication port on which your mobile has been connected. once you are done with this you can give the basic AT command, type simple AT in the window so you will get "OK" response. Now there are basically two modes to work for mobile phones. one is PDU and another is text mode. PDU is protocol data unit. Mobile normally understands internally in PDU format. We can use both. AT+CMGF is the command to set the mode. If we type AT+CMGF=0 the PDU mode is set. If we type AT+CMGF=1 the text mode is set. If we want to check which mode has been set we can type simple AT+CMGF? so it will show the result.
Now for example we want to dial out a number called "111" the command is ATD 111 or ATD "111".
To send an SMS first we have to set the mode in text. We can send SMS in both the modes but the format of typing text to send SMS is different. For normal usage we use text mode. So type AT+CMGS="9198XX21XX99", "Message" ^ctrlZ. So SMS will be sent out from your PC through mobile phone. To read an SMS from the inbox we have to write AT+CMGR=1 to read the sms stored at 1st location. The location starts from 0 so be careful. To delete an SMS type AT+CMG
NOKIA GSM AT COMMAND SET
Call Control
| Command | Description |
|---|---|
| ATA | Answer Command |
| ATD | Dial Command |
| ATH | Hang Up Call |
| ATL | Monitor Speaker Loudness |
| ATM | Monitor Speaker Mode |
| ATO | Go On-Line |
| ATP | Set Pulse Dial as Default |
| ATT | Set Tone Dial as Default |
| AT+CSTA | Select Type of Address |
| AT+CRC | Cellular Result Codes |
Data Card Control Commands
| Command | Description |
|---|---|
| ATI | Identification |
| ATS | Select an S-register |
| ATZ | Recall Stored Profile |
| AT&F | Restore Factory Settings |
| AT&V | View Active Configuration |
| AT&W | Store Parameters in Given Profile |
| AT&Y | Select Set as s Powerup Option |
| AT+CLCK | Facility Lock Command |
| AT+COLP | Connected Line Identification Presentation |
| AT+GCAP | Request Complete Capabilities List |
| AT+GMI | Request Manufacturer Identification |
| AT+GMM | Request Model Identification |
| AT+GMR | Request Revision Identification |
| AT+GSN | Request Product Serial Number Identification |
Phone Control Commands
| Command | Description |
|---|---|
| AT+CBC | Battery Charge |
| AT+CGMI | Request Manufacturer Identification |
| AT+CGMM | Request Model Identification |
| AT+CGMR | Request Revision Identification |
| AT+CGSN | Request Product Serial Number Identification |
| AT+CMEE | Report Mobile Equipment Error |
| AT+CPAS | Phone Activity Status |
| AT+CPBF | Find Phone Book Entries |
| AT+CPBR | Read Phone Book Entry |
| AT+CPBS | Select Phone Book Memory Storage |
| AT+CPBW | Write Phone Book Entry |
| AT+CSCS | Select TE Character Set |
| AT+CSQ | Signal Quality |
Computer Data Card Interface Commands
| Command | Description |
|---|---|
| ATE | Command Echo |
| ATQ | Result Code Suppression |
| ATV | Define Response Format |
| ATX | Response Range Selection |
| AT&C | Define DCD Usage |
| AT&D | Define DTR Usage |
| AT&K | Select Flow Control |
| AT&Q | Define Communications Mode Option |
| AT&S | Define DSR Option |
| AT+ICF | DTE-DCE Character Framing |
| AT+IFC | DTE-DCE Local Flow Control |
| AT+IPR | Fixed DTE Rate |
Service
| Command | Description |
|---|---|
| AT+CLIP | Calling Line Identification Presentation |
| AT+CR | Service Reporting Control |
| AT+DR | Data Compression Reporting |
| AT+ILRR | DTE-DCE Local Rate Reporting |
Network Communication Parameter Commands
| Command | Description |
|---|---|
| ATB | Communications Standard Option |
| AT+CBST | Select Bearer Service Type |
| AT+CEER | Extended Error Report |
| AT+CRLP | Radio Link Protocol |
| AT+DS | Data Compression |
Miscellaneous Commands
| Command | Description |
|---|---|
| A/ | Re-Execute Command Line |
| AT? | Command Help |
| AT*C | Start SMS Interpreter |
| AT*T | Enter SMS Block Mode Protocol |
| AT*V | Activate V.25bis Mode |
| AT*NOKIATEST | Test Command |
| AT+CESP | Enter SMS Block Mode Protocol |
SMS Commands SMS Text Mode
| Command | Description |
|---|---|
| AT+CSMS | Select Message Service |
| AT+CPMS | Preferred Message Storage |
| AT+CMGF | Message Format |
| AT+CSCA | Service Centre Address |
| AT+CSMP | Set Text Mode Parameters |
| AT+CSDH | Show Text Mode Parameters |
| AT+CSCB | Select Cell Broadcast Message Types |
| AT+CSAS | Save Settings |
| AT+CRES | Restore Settings |
| AT+CNMI | New Message Indications to TE |
| AT+CMGL | List Messages |
| AT+CMGR | Read Message |
| AT+CMGS | Send Message |
| AT+CMSS | Send Message from Storage |
| AT+CMGW | Write Message to Memory |
| AT+CMGD | Delete Message |
SMS PDU Mode
| Command | Description |
|---|---|
| AT+CMGL | List Messages |
| AT+CMGR | Read Message |
| AT+CMGS | Send Message |
| AT+CMGW | Write Message to Memory |
