Applications Remote monitoring intercom with GSM and microphone/speakers, Remote monitoring camera with GPRS TF camera extension board, Wechat payment slot machine scheme with the slot machine function. Anti-theft tracking device with GPRS GPS and accelerometer Supports voice call and SMS message. Supports GSM/ GPRS frequency: 850/ 900/ 1800/ 1900 MHz. Supports GPRS data service, the maximum download data rate is 85.6 Kbps, upload data is 42.8 Kbps. Supports GSM07.07, 07. 05 AT commands and Ai-Thinker explosion command. Supports 3 serial ports, one download serial port, one AT command port. Specifications Size: 19.2mm x 18.8mm x 3mm Working temperature: -30 ℃-80℃ Working voltage: 3.5v – 4.2v (it’s best to power by 4v) Power voltage: >3.5 Volts Low power consumption: Sensitivity GPIO level: 2.8 volts Pinout Connections Connect USB-TTL with 4 wires when debugging, VUSB-5V; GND-GND; AT_TX-RX; AT_RX-TX Or power supply by USB, then connect another three lines, GND-GND; AT_TX-RX; AT_RX-TX Or power by lithium battery, VBAT-(3.3v-4.2) V; GND-GND; AT_TX-RX; AT_RX-TX; (VBAT power supply, need to press power_key button for about 2s) Power On A9G development board can be powered by USB or lithium battery. It does not require any operation when powered 1-2s. Please press the Rst_Key button to reset. The module enters AT command mode by default. NOTE: The board needs 2A supply with 100uF and 10uF over VCC and GND Resources AT Command Set Documentation Datasheet Quick Setup
