FLOW-BUS is a fieldbus, designed by Bronkhorst High-Tech BV, based on RS485 technology, for digital communication between digital devices, offering the possibility of host-control by PC.


Thermal Mass Flow Controller with FLOW-BUS interface
Thermal Mass Flow Controller with FLOW-BUS interface


  • Baud rate fixed on 187,5 kBaud
  • +15...+24 Vdc supply voltage
  • easy installation and communication with other Bronkhorst equipment
  • automatic node search
  • automatic bus optimization (gap fixing)
  • PC-communication through RS232 via local-host function or stand-alone interface
  • option: galvanic isolation up to 500 V (for data lines)
  • connection of max. 120 instruments to 1 bus
  • max. bus length: 600 metres

FLOW-BUS system example

FLOW-BUS downloads

FLOW-BUS and Modbus Accessories
FLOW-BUS manual