From Makers Electronics's description
GSM Module SIM900A The SIM900A GSM modem is a communication device that allows you to establish a GSM (Global System for Mobile Communications) connection to send and receive data, including text messages and calls, over the cellular network. It is commonly used in various applications, including remote monitoring, IoT (Internet of Things) projects, and SMS-based systems. SIM900A chip parameters: Power saving mode: Typical power consumption in SLEEP mode is 1.5mA Frequency bands:SIM900A Dual-band: EGSM900, DCS1800. The SIM900A can search the two frequency bands automatically. The frequency bands also can be set by AT command. GSM class: Small MS GPRS connectivity:GPRS multi-slot class 10 (default) , GPRS multi-slot class 8 (option) Transmitting power: Class 4 (2W) at EGSM 900, Class 1 (1W) at DCS 1800 Operating Temperature: -30ºC to +80ºC Storage Temperature: -5ºC to +90ºC DATA GPRS: download transfer max is 85.6KBps, Upload transfer max 42.8KBps Supports CSD, USSD, SMS, FAX Supports MIC and Audio Input Speaker Input Features keypad interface Features display interface Features Real Time Clock Supports UART interface Supports single SIM card Firmware upgrade by debug port Communication by using AT commands The power supply voltage: 5 V Power supply current: > 1 A Key Features of The SIM900A GSM module: GSM Communication: The SIM900A module provides GSM communication capabilities, allowing you to connect to mobile networks for data transmission and voice communication. SMA Antenna: The SMA antenna connector is used to attach an external antenna to the modem. This is particularly useful in situations where you need to improve signal reception, such as in remote or shielded areas. SIM Card Slot: The module typically includes a SIM card slot where you can insert a GSM SIM card. The SIM card is necessary for authenticating your device on the mobile network. Serial Communication: The SIM900A communicates with a microcontroller or computer using serial communication (UART). You send AT commands to the module to control its functions and retrieve data. Voltage Input: The module usually requires a DC power supply voltage within a specified range, often around 3.4V to 4.5V, to operate properly. Digital and Analog I/O Pins: Some versions of the module may provide digital and analog pins that allow you to interface with external sensors or devices. SMS and Call Functions: You can use the SIM900A to send and receive SMS messages and make or receive phone calls. It can be programmed to perform specific actions based on received SMS commands. Data Transmission: The module supports data transmission over GPRS (General Packet Radio Service) and can be used for internet connectivity in addition to SMS and voice communication. Applications: Remote Monitoring: Monitoring and controlling remote equipment and systems via SMS or data communication. IoT Projects: Integrating GSM communication into IoT devices for remote data collection and control. Security Systems: Sending SMS alerts in security and alarm systems. Telemetry and Data Logging: Collecting and transmitting data from remote sensors and loggers. Vehicle Tracking: Tracking the location and status of vehicles and assets. Home Automation: Implementing SMS-based control and monitoring of home automation systems. Industrial Automation: Integrating GSM communication into industrial control and automation processes. Prototyping and Experiments: Using the module for prototyping and experimentation in electronics and communications projects.
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