Datasheet

4. Arduino M95 GSM Shield description
 LEDs: Red LED – Network Light
permanently OFF M95 module is OFF
64 ms ON / 800 ms OFF M95 is not logged in the network
64 ms ON / 2000 ms OFF M95 is logged in the network
64 ms ON / 600 ms OFF Ongoing GPRS data transfer
 Green LED: Shield Powered
5. Connectors on M95 Shield:
Conn J1 (POWER) Signal
PIN1 No connection
PIN2 No connection
PIN3 5VDC from Arduino board
PIN4 GND
PIN5 GND
PIN6 VIN – 6-12VDC from external power source
Conn J2 (ANALOG) Signal
PIN1 No connection
PIN2 No connection
PIN3 No connection
PIN4 No connection
PIN5 No connection
PIN6 No connection
Conn J3 (Digital8_13) Signal
PIN1 PWRKEY (default)
PIN2 EMERG (default)
PIN3 GSMON (must be HIGH to enable communication with M95)
PIN4 No connection
PIN5 No connection
PIN6 No connection
PIN7 GND
PIN8 No connection
Conn J4 (Digital0_7) Signal
PIN1 D0_RX (Arduino ---> M95 GSM Shield) default
PIN2 D1_TX (M95 GSM Shield ---> Arduino) default
PIN3 D2 (Alternative SW RX)