GPRS A6 Module: 

This is the development version of the GSM / GPRS core mini on GPRS A6 module. It supports GSM / GPRS dual band network, available for GPRS and SMS for data transmission.

The board features compact size and low current consumption. With power saving technology, consumption is as low as 3mA in sleep mode.

It communicates with microcontrollers through the UART port, supporting commands including GSM 07.07, GSM 07.05 and Ai-Thinker enhanced AT commands.

Features:

• Working frequency: quad-band network, 850/900/1800 / 1900MHZ
• Working voltage: 4.5-5.2VDC
• Working Current: maximum of 2A
• Sleep Current: 5mA
• Onboard Micro SIM card holder, you can install Micro SIM card
• Communication Interface: TTL serial port
• Baud rate: 115200bps and it can also be set by AT command.
• Interface logic voltage: 3.3V
• Make and answer phone calls using a headset and electret microphone.
• Send and receive SMS messages.
• Send and receive GPRS data (TCP/IP, HTTP, etc.) .
• Be used to test the Ai-Thinker GPRS A6 module
• Pin pitch: 2.54mm
• Onboard antenna interface: IPX and pad for spring antenna

Antena:

• Suitable for SIM800L GSM modules / Arduino SIM900 GPRS Shield
• Frequency: 780MHz~960MHz, 1710MHz~2170MHz
• Antenna gain: +2.0 ± 0.7 dBi @ 880 MHz, +2.0 ± 0.7 dBi @ 1800 MHz
• S.W.R <= 2.0 @ 2100 MHz ~ 2500 MHz
• Output Impedance: 50 Ohm
• Usage: It can be soldered directly to the board.

Parameter:

Packing Lists:

• 1 Module 
• 1 Antenna
• 2 * 1*8 P pin header

Document: 

Download Link: https://drive.google.com/folderview?id=0B6uNNXJ2z4CxTzdreHF0Z0lLYjQ&usp=sharing

Reference Tutorial: https://alselectro.wordpress.com/2016/09/14/gsm-a6-with-arduino-making-a-call-sending-sms/

Sơ đồ chân:

• H_TXD: Chân Debug của Module Sim A6, thường không sử dụng.
• H_RXD: Chân Debug của Module Sim A6, thường không sử dụng.
• GND: Chân Mass, 0VDC.
• RS232_RXD: Chân RX giao tiếp RS232
• RS232_TXD: Chân TX giao tiếp RS232
• GND: Chân Mass, 0VDC.
• U_RXD:Chân RX giao tiếp UART TTL
• U_TXD: Chân TX giao tiếp UART TTL
• VCC_IN: Nguồn vào 5~9VDC, > 1A.
  
• Mic-: Chân Micro Module Sim A6
• Mic+: Chân Micro Module Sim A6
• REC+: Chân REC Module Sim A6
• REC-: Chân REC Module Sim A6
• INT: Chân kích hoạt chế độ Low Power (Sleep) của Module Sim A6, kéo xuống Mass (0VDC)để kích hoạt.
• PWR: Chân Khởi động nguồn Module Sim A6, mặc định kích hoạt khi cấp nguồn.
• EN: Chân Enable module Sim A6, mặc định là Enable, thường không sử dụng.