Compact universal modem

µPORT 3G was designed as a small and cost-effective modem for remote data transmission from electricity meters and different types of controllers and devices equipped with an RS-485 serial interface. The modem features a proven 3G radio communications module, RS-485 serial interface with an additional power supply line, and a potential-free input.


  • Small dimensions (height × width × depth): 85 × 96 × 34 mm
  • High protection rating: IP53
  • Power supply voltage: 100 to 240 V AC
  • Broad range of operating temperatures: -25 to +60°C
  • Sealed connector cover to protect against unauthorized access
  • Clear status and signal level indications with LEDs on the front panel
  • Power consumption: 5 W (average)
  • DIN rail mounting capability

Radio communications

  • 900/1800 MHz for CSD on 2G networks
  • 900/1800 MHz for GPRS/EDGE on 2G/2.5G networks
  • 900/2100 MHz for UMTS/HSPA on 3G networks


  • Support of TCP/IP, UDP/IP, ICMP, Telnet
  • Transparent handling of data from the serial interface
  • Powerful feature set to support electricity meters (including time synchronization and automatic protocol recognition)
  • Real-time clock with battery backup; clock synchronization via NTP or from the GSM
  • Remote and local hardware and software restart feature
  • Proprietary algorithms to monitor key quality metrics of the entire communication channel in TCP/IP mode and GSM mode: Link Control and GPRS Control
  • Device configuration access security controls
  • Internal event log
  • Built-in IP address filter to support whitelisting and blacklisting for inbound connections
  • Compliance with industry standards in terms of technical and security specifications


  • RS-485 serial interface with a power supply line (terminal block)
  • mini USB 2.0 configuration port
  • SMA antenna port
  • SIM card slot (2FF USIM)
  • Potential-free input