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.


  • +15 or +24 Vdc power supply
  • 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

EL-FLOW® Prestige with EtherNet/IP interface
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