Скачать или смотреть SIM900A GSM Module-Send SMS & Make a Call using AT Commands

Let's explore how to use SIM900A GSM Module to send SMS and Phone Call using AT Commands. We'll use USB-to-RS232 adapter/cable to connect SIM900A GSM Module with Computer. We can also use USB-UART Bridge instead along with PuTTY Terminal Software. In this lesson, we'll start with AT commands to test first if module works? and later we'll use advance AT Command to perform following tasks:
1. GSM Module Testing
2. Send & Read SMS thorugh GSM Module
3. Make a phone call and receive incoming call
4. Find out Network operator
5. Hangs up the Call

List of AT Commands for SIM900A GSM Module:
The SIM Module comes with Auto baud settings most often comes with 9600 baud
AT
AT+COPS? -- Know your OperatorAT
ATDXXXXXXXXXX; -- To make a call
ATH -- Hangsup the call
ATA -- Receive call
AT+CMGL="ALL" -- Read ALL Messages
AT+CMGR=1 -- Read only First Message
AT+CMGR=2 -- Read Second Message
AT+CMGD=1 -- Delete 1st Message
AT+CMGL="ALL"
AT+CMGF=1
AT+CMGS="8007770636"
-- Hello from BINARYUDPATES.COM
-- CTRL+Z
ok