Invisible Systems Ltd

Model GPRS, GPS & RF - Gateway



The internet gateway interfaces with the Invisible range of wireless transmitters and metering systems. Using analogue inputs and outputs and a radio frequency interface for data collection it is used for remote asset monitoring and energy data harvesting.


  • 868Mhz RF to GPRS Internet Gateway up to 1km (line of sight)
  • Collects data wired locally through I/O or from a network of up to 80 RF Sensors
  • 4 x Analogue Inputs
  • 4 x Digital Inputs
  • 4 x Digital Outputs
  • RS232/RS485
  • Includes GPRS SIM secure VPN, private APN with true roaming capabilities
  • Daughter Board Available to increase I/O availability to 12 Analogue and 16 Digital inputs
  • Optional GPS provides real time location and tracking, essential for critical site condition monitoring and mobile applications
  • Optional Ethernet connectivity
  • Enables transfer of data from remote site over UDP or FTP
  • Operates in conjunction with RealTime Online software
  • AEA - 128 bit encryption

Technical information
Power Supply: Rated voltage: AC 230 V 50Hz, Power consumption: 3.6W, Fuse: 100mA, Optional: 12vDC
Inputs: 4 Digital Inputs, 4 Analogue Inputs (0-1v, 0-5v, 0-10v, 4-20mA), Specify at time of order
Outputs: 4 Open collector outputs (max 30VDC, 50mA)
Memory: 64kb
RTC: Battery backed real time clock
Comms: RS485 (configurable MODBUS), RS232 Ethernet (optional)
Modem: Quad Band 850MHz -1900MHz
Duplex: Bi-Directional communications via GPRS
RF: Frequency: Europe 868.950MHz, Power: 50mW, Range: up to 1km (line of sight)
Other frequencies available (433MHz, 458MHz & 915MHz)

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