4-noks Gateway Modbus RS485 2018-12-17T14:01:54+00:00

Gateway Modbus RS485


The RS485 Modbus Gateway – ZigBee ZC-GW-485-EM is part of an assortment of 4-noks ZigBee devices. The purpose for which it was created is to interface a PLC (Programmable Logic Control) or a PC with the 4-noks ZigBee devices network through a RS485 serial interface and a standard protocol universally recognized such the Modbus/RTU.


The employment of the Modbus protocol grants an immediate use with all the commercial PLCs and also with most of the commercial SCADA’s for PC.

  • Protocol converter from Modbus/RTU to ZigBee
  • Standard Modbus RS485 interface
  • Coordinator function for a ZigBee network
  • Local memory stores battery powered sensors data
  • Transparent bridge towards other Modbus devices
  • External antenna

General characteristicS

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

RF characteristics

  • Frequency: 2405 MHz ÷ 2480 MHz
  • Modulation: DSSS
  • Nominal transmission power: 1mW (0 dBm)
  • Receiver sensitive: -92 dBm
  • External antenna gain: 5,5 dB
  • Outdoor/indoor range: 100m/30m


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


  • RS485 with plug off morsels (3,81 mm pitch)

Environment Parameters

  • Operating temperature: -10 ÷ +60°C; <80% U.R. non condensing
  • Storage temperature: -20 ÷ +70°C; <80% U.R. non condensing
  • Degree of protection: IP 50

Compliant with 2006/95/EEC, 89/336/EEC, 99/5/EEC directives, Product law applied

  • ETSI EN 300 328: Radio Compatibility for digital 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 Security
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