GSM Click

Precision control

GSM click is the easiest way to add GSM/GPRS communication to your device. The click features Telit's GL865-QUAD module. GSM click runs either on 3.3V or 5V power supply and communicates with the target microcontroller via UART interface.

Python Script Interpreter

It is possible to run an application from inside the module via the embedded Python Script Interpreter. Python is an easy-to-use programming language with clear syntax, and an interface that makes it simple to test small snippets of code.

Quad-band coverage

The module has worldwide coverage - 850/900/1800/1900 MHz frequencies. GSM supports incoming and outgoing voice calls, sms and data communication (via GPRS)

Power saving modes

In power saving mode, the GL865-QUAD uses around 1.5 mA, and in power off mode it uses less than 5 μA. That is considerably low and ideal for IoT devices that rely on long battery life and low power consumption.

Phonebook

The Phonebook function allows storing of telephone numbers in the SIM memory. The capability of the Phonebook depends on the SIM version and its embedded memory. The SIM card socket is located at the back side of the click board.

Additional information about the GSM click

GSM click contains TXB0106 6-bit bidirectional voltage-level translator, for interfacing components that operate on different voltages from one another.

On-board SMA antenna connector as well as 3.5mm quadrupole earphone/microphone jack.

An onboard jumper (J1) is used to switch between 3.3V and 5V I/O voltage levels; by default, it's soldered in the 3.3V position.

Applications

Remote monitoring automation, asset tracking, surveillance and security, home automation systems, point of sales terminals etc.

Specification

Key features

• GL865-QUAD from Telit
  • Quad-band GSM | GPRS 850 / 900 / 1800 / 1900 MHz
  • TCP/IP protocol stack
  • integrated 3GPP protocol stack
  • Power consumption in power off mode: 5μA
  • Sensitivity:
    • 108 dBm (typ.) @ 850/900 MHz
    • 107 dBm (typ.) @ 1800/1900 MHz
• TXB0106 voltage-level translator
• Phyton Script Interpreter
• Interface: RX, TX, INT, PWM, CS, RST and AN pin
• Either 3.3V or 5V power supply

Pinout diagram

This table shows how the pinout on GSM click corresponds to the pinout on the mikroBUS™ socket (the latter shown in the two middle columns).

Notes	Pin	mikroBUStm				Pin	Notes
Power ON monitor	PWRMON	1	AN	PWM	16	GPIO2	Jammer Detect Report
External SIM signal – Reset	RST	2	RST	INT	15	CTS	Output for Clear to send signal
Input for Request to send signal	RTS	3	CS	TX	14	RXD	Serial data input (TXD) from DTE
Not connected	NC	4	SCK	RX	13	TXD	Serial data output to DTE
Not connected	NC	5	MISO	SCL	12	NC	Not connected
Not connected	NC	6	MOSI	SDA	11	NC	Not connected
Power supply	+3.3V	7	3.3V	5V	10	+5V	Power supply
Ground	GND	8	GND	GND	9	GND	Ground

Programming

The following code snippet shows how the GSM engine is initialized. The function calls the initialization of AT adapter, timer and parser. This should be done before executing any other function.

 1 void GSM_init( void )
2 {
3     engine_init( gsm_default_handler );
4     hal_gsm_pwr( 0 );
5     Delay_ms( 100 );
6     hal_gsm_pwr( 1 );
7     Delay_ms( 2500 );
8     hal_gsm_pwr( 0 );
9
10     at_cmd( "AT" );
11     at_cmd( "AT+CSCS="GSM"" );
12     at_cmd( "AT+CMGF=1" );
13 }