Product Details
The A9 is a remarkable complete quad - band GSM/GPRS module powered by the RDA8955 chip. Thanks to the cost - effective core chip, it offers users an economical yet powerful IoT solution. With built - in protocol stacks like GSM/GPRS, this module supports basic phone voice calls, SMS services, serial to GPRS, and GPS data transmission. It's suitable for a wide array of applications, including IoT projects, vehicle - mounted devices, remote localization, and electric power environment monitoring. Users can make voice calls, send SMS, access the internet, and get base position information just by inserting a SIM or IoT card. The A9 can communicate with other devices via AT commands. Additionally, it comes with 29 GPIOs and an integrated SDK, which makes private redevelopment a breeze. Features include a 32 - bit RISC core with a frequency up to 312MHz, 4k instruction and data caches, up to 29 GPIOs (with two download pins), a PMU for lithium battery charge management, quad - band GSM/GPRS support (850/900/1800/1900MHz), voice call and SMS capabilities. Specifications involve a working temperature range of - 20℃ to + 70℃, an average low - power mode current below 2mA, GPRS Class 10, sensitivity less than - 105dB, a GPIO level of 2.8V, support for GPRS data service with a max download rate of 85.6 Kbps and upload rate of 42.8 Kbps, and support for standard GSM07.07, 07.05 AT commands and Ai - Thinker expandable command sets. You can find more details on the product wiki.
Using the A9 module is quite straightforward. First, insert a SIM or IoT card into the module. Then, you can start making voice calls, sending SMS, or accessing the internet right away. To communicate with other devices, use AT commands. If you plan to do some private redevelopment, the 29 GPIOs and integrated SDK will be very helpful. When it comes to the working environment, make sure the temperature stays between - 20℃ and + 70℃. This will keep the module running smoothly. Also, the module has a low - power mode with an average current below 2mA, which helps save energy. Regarding maintenance, there's not much you need to do. Just keep it clean and away from moisture. If you have any technical questions, refer to the product wiki for more information.
