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The IntesisBox Gateway has been specially designed to allow bidirectional control and monitoring of Hitachi VRF SET FREE systems from a BMS, SCADA, PLC or any other device working as a Modbus Master.

Modbus Hitachi RC

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  • IBMBSHIT016O000 (for 16 indoor units)
  • IBMBSHIT064O000 (for 64 indoor units)



IntesisBox Modbus Server – Hitachi AC is a communication gateway for Hitachi VRF SET FREE compatible indoor units.

IntesisBox continuously polls (read) all the signals configured and maintains the updated values to be served in Modbus. When a write is done from Modbus in a gateway's Modbus address (allowed to be written), the corresponding order is sent to the AC unit signal associated.

IntesisBox is capable of managing up to two simultaneous Modbus master connections and includes all hardware needed to connect directly with Hitachi H-Link bus.



  • Manages Modbus TCP and Modbus RTU simultaneously. 
  • Up to 6 Modbus TCP clients (incoming sockets) are supported.
  • Direct access to H-LINK bus.
  • Compatibility with a complete range of Hitachi VRF indoor units.
  • Scan: Automatic identification of the units presents in the H-LINK bus.
  • Wide range of monitoring & control datapoints available. 
  • Outdoor unit’s signals available for the integration.
  • Datalogging through external USB port. 
  • Configuration through IP or USB (Console) port. 
  • Front cover LED indicators to provide easy to check communication status on both the Ethernet and serial ports. 
  • Includes IntesisBox MAPS with automatic updates for both IntesisBox MAPS and Gateway’s firmware.

Hitachi VRF SET FREE systems to Modbus Gateway Integration examples

Integration of Hitachi VRF Air Conditioner Units into a ModBus installation

Hitachi VRF SET FREE systems to Modbus Gateway Integration examples 820

Hitachi VRF SET FREE systems to Modbus Gateway


  • Technical documentation