SIM800A GSM-GPRS Modem

SIM800A GSM/GPRS Serial & TTL Modem

The SIM800A Quad-Band GSM/GPRS Module with RS232 Interface is a comprehensive solution for Quad-band GSM/GPRS communication, packaged in an LGA (Land Grid Array) format suitable for embedding in customer applications. The SIM800A module supports Quad-band operation across 850/900/1800/1900 MHz frequencies, enabling transmission of voice, SMS, and data with low power consumption.

With its compact dimensions of 100 x 53 x 15 mm, the module can easily meet the slim and compact requirements of custom designs. It includes an Embedded AT command set, offering cost savings and rapid time-to-market for customer applications.

The SIM800A modem features a GSM chip and an RS232 interface, allowing convenient connection to computers or laptops using a USB to Serial connector, or to microcontrollers using an RS232 to TTL converter. When connecting the SIM800A modem via the USB to RS232 connector, it is necessary to identify the correct COM port from the Device Manager of the USB to Serial Adapter.

Once the connection is established, you can use terminal software like Putty to open a connection to the designated COM port at a baud rate of 9600, which is the default baud rate for this modem. After establishing a serial connection through the computer or microcontroller, you can begin sending AT commands. When sending AT commands (e.g., "ATr"), the SIM800A modem should respond with "OK" or another appropriate reply depending on the specific command sent.

Features:

• Quad-band 850/900/1800/1900MHz.
• GPRS class 2/10.
• Control via AT commands (3GPP TS 27.007, 27.005 and SIMCOM enhanced AT command set).
• High-Quality Product (Not hobby grade).
• 5V interface for direct communication with MCU kit.
• Configurable baud rate.
• Built-in SIM Cardholder.
• Built-in Network Status LED.
• Inbuilt Powerful TCP/IP protocol stack for internet data transfer over GPRS.
• Low power.

Applications :

• Remote Data Monitor and Control.
• Water, gas, and oil flow metering.
• AMR (automatic meter reading).
• Power station monitoring and control.
• Remote POS (point of sale) terminals.
• Traffic signals monitor and control.
• Fleet management.
• Power distribution network supervision.
• Central heating system supervision.
• The weather station data transmission.
• Hydro-logic data acquisition.
• Vending machine.
• Traffic info guidance.
• Parking meter and Taxi Monitor.
• Telecom equipment supervision (Mobile base station, microwave or optical relay station).