Title: The GSM module by using AT command

METHODOLOGY (8)

CONTENT:

This is a GSM module that I have used in my project. The type is GSM/GPRS/CDMA and the reference number is G900/180 C800. This GSM module used AT command to make a codding. There are have many type of command depends on what we want to do. For my project, this GSM was used to send SMS only to the data base. So I need to use AT+CMGS to send SMS to number of telephone (data base). If to read the SMS, I need to use another type of command that is AT+CMGR. And if to delete the SMS need to use AT+CMGD. But in my project, I only focus on AT+CMGS command.

The at command is a Command Prompt command that can be used to schedule other commands and programs to run at specific dates and times.

A GSM modem is a specialized type of modem which accepts a SIM card, and operates over a subscription to a mobile operator, just like a mobile phone. From the mobile operator perspective, a GSM modem looks just like a mobile phone.

When a GSM modem is connected to a computer, this allows the computer to use the GSM modem to communicate over the mobile network.  While these GSM modems are most frequently used to provide mobile internet connectivity, many of them can also be used for sending and receiving SMS and MMS messages.

GSM uses a variation of time division multiple access (TDMA) and is the most widely used of the three digital wireless telephony technologies (TDMA, GSM, and CDMA). GSM digitizes and compresses data, then sends it down a channel with two other streams of user data, each in its own time slot. It operates at either the 900 MHz or 1800 MHz frequency band.

OBJECTIVE:

1.) To make the command depends on the process of my project.

2.) To learn and understand how to do the AT command.

3.) To make the GSM function and capable to send SMS.

CONCLUSION:

For this part, I have successfully to do the AT command, this is a new thing that I have learn and do not familiar about it before. But now, I can understand it.