GSM Interface Module Datasheet iWave Systems Technologies Pvt Ltd Page 1 Product Overview GSM Interface Module The GSM/ GPRS interface board supports the communication between CPU board and external devices. The board can be used to send and receive SMS as well as to make and receive calls. The GSM / GPRS board is based on HiLoV2 GSM module. The board has a SIM connector, which is used to connect the SIM with the module and give access to the network. In the board, 6-pin header is provided for the communication with the CPU board. The board has standard DB9 connector to interface with the PC.
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GSM Interface Module - iWave Systems Interface Module Datasheet iWave Systems Technologies Pvt Ltd Page 1 Product Overview GSM Interface Module The GSM/ GPRS interface board supports
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GSM Interface Module Datasheet
iWave Systems Technologies Pvt Ltd Page 1
Product Overview
GSM Interface Module
The GSM/ GPRS interface board supports the communication between CPU board and external devices. The board can be used to send and receive SMS as well as to make and receive calls.
The GSM / GPRS board is based on HiLoV2 GSM module. The board has a SIM connector, which is used to connect the SIM with the module and give access to the network. In the board, 6-pin header is provided for the communication with the CPU board. The board has standard DB9 connector to interface with the PC.
GSM Interface Module Datasheet
iWave Systems Technologies Pvt Ltd Page 2
Index
Technical Specification 3
Summary 3
Board Description 3
Interface Details 4
Power 4
Input & Output 5
Communication 5
SIM Specification 6
Physical Characteristics 7
Reference Schematics 8
Contact Details 12
GSM Interface Module Datasheet
iWave Systems Technologies Pvt Ltd Page 3
Summary
Board Description
Technical Specification
GSM Module: HiLoV2
Operating Voltage: 3.3V
Input Voltage (recommended): 5-5.5V
Current Consumption : 2.2A maximum during burst mode of data transfer
The board can operate on 5V DC line. Power jack (2.5mm) is provided to draw external 5V from AC to
DC Adapter. The LDO regulator present in the board steps down the voltage to 3.3V, which is the
required power supply for the GSM module.
Two 4 Pin connectors are provide on the board, to draw 5V and 3.3V directly from the main CPU board.
(These connectors can be used during testing or debugging). The power source can be selected based on
the requirement and conditions.
The Power Pins are as follows:
VCC_5V: The DC power supply used to power the switching regulator on the board.
VCC_3V3: A 3.3 volt supply generated by the on-board regulator. Maximum current drawn is
3A.This 3.3V can be also supplied from CPU board through the 4 pin power connector.
GND: Ground pins.
Table 2: Interface between GSM Interface Board and PC through UART Pin Type Signal Name Description(RS-232 compatible signals) 2 I/O UART_TX Tx Signal from GSM Module goes to Rx of PC 3 I/O UART_RX Tx Signal from PC goes to Rx of GSM Module 7 I/O UART_RTS RTS Signal from PC goes to RTS of GSMModule 8 I/O UART_CTS CTS Signal from GSM Module goes to CTS of PC
Table 1: Interface between CPU boardand GSM Interface Board Pin Type Signal Name Description 1 I/O CTS Clear to Send signal from Module 2 I/O RTS Request To Send signal to Module 3 Power GND Ground Signal 4 I/O TX Data Transmit signal from Module 5 I/O RX Data Receive signal to Module 6 Power 1.8V Power Supply
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Communication
Input & Output
The GSM Interface Board has a number of communicating options with CPU boardand PC.
The Different Input and Output options are detailed below:
6 Pin Header: The 6 Pin header is used for interfacing with the CPU board. It carries Transmit and Receive Signals from GSM Module along with Handshaking signals.
Standard DB9: Standard DB9 is provided for PC communication. This can also be used for Software updating as well as for CPU Board Interface.
Reset Switch: Push button Reset option is provided for Reset of the board externally by the user.
LED: An LED is provided on board to indicate 3.3V is ON.
The GSM board has a number of facilities for communicating with a computer, CPU board, another GSM
board or other GSM phones. The HiLomodule provides UART serial communication, which is available
on digital pins 26 (RX) and 13(TX).These signals are converted to TTL level (5V) and can communicate
with PC through DB9 port. The board can communicate with CPU board through the 6 pin header.
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SIM Specification
The board provides the provision to connect the SIM with the GSM module for external communication.
The signals for the management of SIM card are provided by the GSM module. Table 3 describes the pin
details of the SIM connector. To prevent SIM card’s damages, the power supply of the module has to be
turned off before any manipulation on SIM card.
The SIM card needs a power supply of 1.8V which is generated by the GSM module and directly
connected to the 1st and 5th pin of SIM connector, which provides the power supply input for SIM card.
Table 3:SIM card Interface Pin Details Pin Type Signal Name Description 1 Power VSIM 1.8V generated by the GSM module 2 Input SIM_RST SIM reset, Provided by the GSM module 3 Input SIM_CLK SIM clock provided by the GSM module 4 Power GND SIM Ground 5 Power VSIM 1.8V generated by the GSM module 6 I/O SIM_DATA SIM serial data line
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Physical Characteristics
The length and width of the GSM Interface Board is 70mm x 75mm respectively. Four mounting holes allow the board to be attached to a surface or case.