EM121A - Terminal with RS232,RS485,Digital Input/Output ports, Analog Input Ports (0-10V/4-20mA ) and Real time clock with battery Backup

Salient Features

  • Intelligent GSM/GPRS/EDGE Quad Band Terminal
  • RS232, RS485 and USB ports
  • 10 Digital Ports (configurable as DIs or DOs),
  • 2 Analog Input Ports (configurable as 0-10V or 4-20mA), 1 Analog Output
  • 400KB RAM and 1.7MB Flash Memory
  • Real Time Clock with Battery Backup
  • Embedded multithreaded software for data acquisition, processing and communication
  • Optional enhanced AT Command mode
  • 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
  • ARM© Core, Blackfin© 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 RS485 serial interface
  • 1 x USB 2.0 full speed
  • SIM card interface 3V, 1.8V
  • I2C bus and SPI bus interface
  • 2 Analog Input Ports (configurable as Voltage I/P or 4-20mA)
  • 1 Analog output port (PWM)
  • 10 Digital Ports (configurable as input ports or output ports)

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.

  • 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 RS485 bus
    • 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 using 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 sent alarms via SMS/Email to selected group of numbers/addresses
    • Configure alarm messages and group of recipients to whom alarms are to be sent 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 connected devices based on various events
    • Activate/Deactivate digital outputs on scheduled basis
    • 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
    • Accepts 4-20 mA analog inputs
    • Provision to configure conversion factor, measurement unit
    • Provision to log analog reading on periodical basis
    • Setting up of upper and/or threshold limits
    • Generation of events and alerts when threshold values 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


  • Remote Data Acquisition using SMS/HTTP/FTP or Socket
  • Remote Monitoring and Control
  • Data Logging, Processing and Communication
  • Simple Automation
Download Brochure
Enquiry Form