EM231 - Intelligent GSM/GPRS Terminal with In-built GPS and I/O Ports

Salient Features

  • Intelligent GSM/GPRS/EDGE Quad Band Terminal with In-built GPS
  • RS232 and USB ports
  • SPI/I2C interface
  • 10 Digital Inputs, 2 Analog Inputs
  • 400KB RAM and 1.7MB Flash Memory
  • Can continuously scan GPS data store and/or communicate the same over GPRS or SMS
  • Real Time Clock with battery backup
  • Embedded multithreaded software for data acquisition, processing and communication
  • Over The Air (OTA) firmware updation
  • Customizable standard or proprietary protocols
  • AES encryption

General Specifications

  • Quad-Band GSM 850/900/1800/1900 MHz
  • GPRS multi-slot class 12
  • GSM release 99
  • Output power:
    • Class 4 (2 W) for EGSM850
    • Class 4 (2 W) for EGSM900
    • Class 1 (1 W) for GSM1800
    • Class 1 (1 W) for GSM1900
  • GPRS class 12: max. 86 kbps (DL & UL)
  • Mobile station class B
  • CSD Data transmission up to 14.4 kbps
  • ARMİ Core, Blackfinİ DSP
  • Memory: 400 KB (RAM) and 1.7 MB (Flash)
  • Over The Air updation of software
  • Real Time Clock with battery backup
  • SMA antenna connector
  • 1 x RS232C serial interface
  • 1 x USB 2.0 full speed
  • I2C bus and SPI bus interface
  • SIM card interface 3V, 1.8V
  • 2 Analog Input Ports ( 0 - 5 / 0 - 10V DC)
  • 1 Analog output port (PWM)
  • 10 Digital inputs (0-0.8V Low input and above 2.7V High input)
  • Wide range input voltage 12V to 36V DC

GPS specifications


2.5 meters CEP
1µSecond RMS (1 PPS)

Acquisition Rate

Cold start
35 sec, typical
Warm start
33 sec, typical
Hot start
1.3 sec, typical


Cold start

Dynamic Condition

18,000 meters (60,000 Feet) max.
400 Km/hr (1000 Knots) max


NMEA, 3GPP, 5 Hz position update rate capability @3D fix

Embedded Firmware Features

This device can have standard or customized embedded firmware as per user requirements

The embedded firmware of this device can be changed or updated Over The Air via GPRS/EDGE. Hence, visits to the sites to upload new embedded firmware can be avoided

The embedded firmware can include following features.

GPS related Features

  • Continuous monitoring of GPS parameters
  • Communication of GPS parameters to a central server via GPRS on predefined intervals or on certain events
  • Query present location via SMS
  • Calculation of distance run and running hours using GPS data
  • Time synchronization from GPS Data

Serial Data capture

  • Listen to the Serial port for data from connected device(s) and capture the data received
  • Communicate on standard protocol like MODBUS with client devices connected on RS232 port
  • Periodical or event based data collection from connected device(s)
  • Logs captured data and send it to the external world using GPRS or SMS
  • Supports communication protocols like Socket, HTTP, FTP or Email
  • Processes captured data and generate events and send alerts to specified mobile numbers or to the server
  • Generate alert message on communication failure with connected device(s)

Digital Inputs

  • Continuous monitoring of digital inputs
  • Generate events and send alarms via SMS/Email to selected group of numbers/addresses
  • Configure alarm messages and group of recipients to whom alarms are to be send for individual input port
  • Provision for reminder alerts and escalated alerts
  • Provision for ring alerts in the event of critical alerts

Digital Outputs

  • Remotely activate/deactivate digital output ports via SMS commands
  • Activate/Deactivate vehicle where the device is installed using SMS Commands
  • Activate/Deactivate connected devices based on various events
  • Activate/Deactivate digital outputs on scheduled basis and/or for a definite period of time
  • Above mentioned features can be used for simple automation processes
  • Complete authentication for remote commands
  • Confirmation messages after executing commands

Analog Inputs

  • Accepts 0-2V or 0-10V analog inputs
  • Provision to configure conversion factor, measurement unit
  • Provision to log analog reading on periodical basis
  • Set up threshold limits and Generate events and alerts when threshold limits are crossed
  • Customizing alert message formats

Analog output

  • Provision to set analog voltage to analog output port.
  • Setting values based on remote commands or on event basis.

Desktop Configuration

  • Desktop configuration software for configuring the terminal

Remote Configuration

  • Configure all important parameters via SMS
  • Full authorization for configuration commands
  • Confirmation for configuration messages
  • Auto restart of the terminal after remote configuration, if required


  • Time critical Applications in Remote Data Capturing.
  • Mobile data acquisition application with position information
  • Automatic Vehicle tracking, monitoring and control applications
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