4-Noks Modbus Wireless Bridge 2018-12-17T14:05:30+00:00

Modbus Wireless Bridge


The Bridge has the main function to connect through a ZigBee network one or more Modbus slave devices equipped with RS485 interface to one of the Gateways of the 4-noks products family.


In this way the BMS/PLC/SCADA System or our Data Loggers connected to the Gateway can communicate with Modbus slave devices eliminating any hard wired installation. This communication link is completely transparent. Furthermore it can be a repeater and a parent device for battery powered sensors.

  • Connecting Modbus devices to the ZigBee network
  • Using Modbus/RTU protocol and RS485 interface
  • Routing function
  • RF power 10mW
  • External antenna
  • Din-Rail version also available ZR-BR.D-EM

General characteristics

  • Chip Ember EM2420
  • Compatible IEEE 802.15.4
  • Stack EmberZnet 3.5.x (ZigBee PRO)
  • Modbus/RTU

RF characteristics

  • Frequency: 2405 MHz ÷ 2480 MHz
  • Modulation: DSSS
  • Nominal transmission power: 1mW (0 dBm)
  • Reception sensitivity: -92 dBm
  • Extern antenna Gain: 5,5 dB
  • Coverage outdoor/indoor: 100m/30m


  • 12-24 Vcc/Vca (±10%); 100mA; 50/60Hz


  • Supply: pull out terminals (3,81 mm pitch)
  • RS-485 interface: extraction clamps (pitch 3.81 mm)

Environment parameters

  • Operating temperature: -10 ÷ +60°C; <80% U.R. not condensing
  • Storage temperature: -20 ÷ +70°C; <80% U.R. not condensing
  • Degree of protection: IP 55

Compliant with 2006/95/EEC, 89/336/EEC, 99/5/EEC directives Reference Norms

  • ETSI EN 300 328: Radio Compatibility for digitals wide band transmissions ETSI EN 301 489: Radio Compatibility
  • EN 61000-6-2: Electromagnetic Compatibility – Emissions
  • EN 61000-6-3: Electromagnetic Compatibility – Immunity
  • EN 60950-1: Electric Safety
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