Modbus RS485 master - KNX Gateway

DIN-Rail mount modules



The Ekinex® Modbus RS485 - KNX Gateway performs a protocol conversion between a serial RS485 Modbus RTU and a KNX TP network. The device works as Modbus master. The device integrates a KNX bus communication module and it is suitable for mounting on a 35 mm DIN rail; it requires an auxiliary power supply.

Technical data

  • Power supply: 8...24 Vac or 12...35 Vdc
  • Absorption at 24 Vdc: 3,5 VA


  • KNX side
  • KNX TP (Twisted Pair) communication port electrically isolated from power supply
  • 1440-byte volatile support “KNX image” memory buffer
Modbus RS485 side
  • RS485 serial communication port, electrically isolated from power supply, 
  • 120 ohm termination resistance pluggable by a 1-way microswitch
  • Modbus master RTU (Remote Terminal Unit) communication
  • Selectable baud rate from 1200 to 115200 baud 
  • Device addressing from 0 to 250
  • Coil, Input, Holding Register e Input Register data exchange
  • Single and multiple register reading/writing
  • 1440-byte volatile support “Modbus image” memory buffer

Ethernet communication port (IEEE 802.3), RJ45 connector, minimum cable category: 5E

The delivery includes the device and terminal blocks to connect to the KNX bus.
Other information
Modbus® is an open source, standard communication protocol suitable for master / slave data exchange between smart devices in various applications, such as industrial production, infrastructure, transportation and energy management.
Functions / Features
  • Plastic casing
  • Connection to bus line with KNX terminal block
  • Installation on 35 mm rail (according to EN 60715)
  • 4 modular units (1 MU = 18 mm)
  • IP20 protection degree (installed device)
  • Weight 145 g
Configurationa and commissioning

A detailed description of the parameters can be found in the application manual of the device. Configuration and commissioning require the application software CGEKBH1TP485.exe

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