The Modbus-TCP protocol is 100% Ethernet-compatible and is used for data exchange between I/O controllers and I/O devices (slaves / field devices). It adapts the widely used Modbus protocol to TCP/IP with Ethernet as the common medium. Modbus-TCP is a master / slave (or client / server) system in which Bronkhorst® instruments can only be implemented as slave devices.

EL-FLOW® Prestige with Modbus-TCP interface
EL-FLOW® Prestige with Modbus-TCP interface


  • +15 Vdc or +24 Vdc supply voltage
  • Physical media: standard Ethernet cabling
  • Network topology: tree, star, ring and daisy-chain
  • Baud rates from 10 Mbps, 100 Mbps and 1 Gbps
  • Communication method: master/slave
  • Max. nodes: unlimited

Modbus-TCP system example

Modbus-TCP downloads

Modbus-TCP accessories
Modbus manual