HOW TO's with AT commands

How to check To which COM port MODEM is connected

A: 

Right Click On MY Computer Icon

Select "Manage" option

From the new window, select "Device Manager" 

From here, you can check for the Ports and Modems 

Double clicking , will display the properties

For Windows system you need to have "Hyperterminal" application

Windows 7 , they have removed the application (Don't know why)

but there are many free available Applications like Hyperterminal 

over the internet.

For Linux users, "minicom" is the best

To install, sudo apt-get install minicom

Q: How To Send SMS From Computer Using  AT Commands

A:

1. Plug In Your GSM/GPRS modem

2. Check to which COM port the modem is connected  

3. Start-> Accessories-> Communication-> Hyperterminal

4. Open new connection

5. "Connect using:" the correct COM port, you will see a

windows->change Bits per second to "9600" (for GSM) "115200" (for GPRS) 

6. Type "AT" and press Enter (it'll show "ok")

7. Type "AT+CMGF=1" and press Enter (it'll show "ok". It is to set the GSM / GPRS modem to operate in SMS text mode. )

8. Type " AT+CMGW="+91723456789"" and press Enter (it'll show ">"."+91" is country code, "723456789" is recipient's number) 

9. Start typing SMS. When finished, press Ctrl + Z (it'll show "+CMGW:1", it means the message is 

stored as index:1 in the message storage) 

10. Type "AT+CMSS=1" and press Enter (It'll show something like "+CMSS: 219". "219" is the reference no of the sent message) 

11. If it shows "OK" at the end, it means the message is successfully sent.

Q: How To Receive SMS Using Computer 

A:

1. Plug In Your GSM/GPRS modem

2. Find out which COM Port the modem is connecting 

3. Start-> Accessories-> Communication-> Hyperterminal

4. Open new connection

5. "Connect using:" the correct COM port, you will see a

windows->change Bits per second to "9600" (for GSM) "115200" (for GPRS) 

6. Type "AT" and press Enter (it'll show "ok")

7. Type "AT+CMGF=1" and press Enter (it'll show "ok". It is to set the GSM / GPRS modem to operate in SMS text mode. )

8. Type "AT+CMGL="ALL" " and press Enter (there is message received, it'll show 

" +CMGL: 1,"REC READ", "+651234567",,"01/08/13,11:26:20+12

Hi, Love You !!! " ) 

Q: How To Check SMS Delivery Status Report & Newly Received Message

A:

1. Follow the Step 1 To 6 as  mentioned above 

2. At The Hyper Terminal, Type The Following AT Command

AT+CSMP=49,167,0,0 

OK

AT+CNMI=2,2,0,1,0 

OK

AT+CMGS="Mobile Number" 

> Message content displayed (Ctrl+Z)

+CMGS: 72

OK

+CDS: 6,228,"Mobile Number",129,"08/10/22,10:08:35+32","13/08/22,12:55:38+32",0

+CMT: "Mobile Number",,"13/10/22,12:56:17+32"

testing

Q: How To Change the Baud Rate of the Modem using AT Commands

A: 

To Change Baud Rate from xxxx to yyyyyy

1. Start-> Accessories-> Communication-> Hyperterminal

2. Open new connection

3. "Connect using:" the correct COM port, you will see a

windows->change Bits per second to "xxxx"

4. Type "ATE1" and press Enter (it'll show "ok")

5. Type "AT+IPR=yyyyyy" and press Enter (it'll show "ok")

6. Click on "disconnect" icon

7. Go to Properties and change the Bits per second to "yyyyyy"

8. Type "AT&W" and press Enter (it'll show "ok")

Then it'll be changed to yyyyyy. 

here : xxxx can be 5600 and  yyyyy : 115200