This is a serial GSM / GPRS core development platform based on the GPRS A6 module. It connects to a dual-band GSM/GPRS network and can transmit SMS and GPRS messages over the internet. The PCB is compact and uses a slight amount of power. Because of the power conservation method, the current rate of consumption in sleep mode is as low as 3mA. It communicates with the MCU via a UART (Serial) port and supports instructions such as GSM 07.07, GSM 07.05, and AiThinker improved. AT Orders.

Features:

Working frequency: quadband network, 850 / 900 / 1800 / 1900MHz

Working voltage: 4.89VDC(Onboard voltage regulator circuit supply power for A6 module)

Working Current: maximum of 2A

Sleep Current: 5mA

Onboard MicroSIM cardholder

Onboard Micro USB interface for external power supply

Communication Interface: TTL serial port / RS232 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 AiThinker GPRS A6 module

Pin pitch: 2.54mm

Onboard antenna interface: SMA and IPX

About the Antenna:

Suitable for 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

Antenna interface: SMA

Pinout of the Board:

EN – module power control enable pin (can control power switch, default high level enable)

VCC_IN – External power supply (3.4V-4.2V ) maximum power supply current 2A

PWR – used for turning module ON/OFF programmatically. For doing this you must pull it HIGH for a moment (less than 500 ms or around).

INT – used to control the module to enter low-power mode, high exit low-level access, in this mode the standby current <1mA ( in this mode the serial port cannot be used)

GND – ground pin. this module has 2 ground pins

U_RXD – serial port for AT commands (receive pin)

U_TXD – serial port for AT commands (transmit pin)

H_TXD – firmware update pin (transmit pin), pin power level 2.8V

H_RXD – firmware update pin (receive pin), pin power level 2.8V

R232_TX – RS232 level control (transmit pin)

R232_RX – RS232 level control (receive pin)

MIC- – microphone –

MIC+ – microphone+

REC- – loudspeaker –

REC+ – loudspeaker +

 

Testing AT Commands

To download the AT Command Set Click Here

for an In-depth tutorial Click Here