Gateway Modbus RS485

  • 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


Modbus ZigBee Devices

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 Scadas for PC.

The gateway, for what concerns the ZigBee network, is one of the available coordinating type devices. This means that it has an active function in the network creation and in keeping the radio traffic between the ZigBee network devices. Moreover, they can work as “father” devices for battery powered sensors and can memorize the information that they asynchronously transmit compared with the ModBus interrogations. Along with the ZR-BR-485-EM device, this gateway offers a transparent Modbus channel.

Technical Specs
General characteristics Chip Ember EM2420
Compatible IEEE 802.15.4
EmberZnet 3.5.x (ZigBee PRO) Stack
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
Supply 12-24 Vcc/Vca (±10%); 100mA; 50/60Hz
Connections 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