The CTC Union GW211W-MQ collects data from compatible Modbus equipment and sends it to an MQTT system over Ethernet or Wi-Fi.

This helps you bring readings from existing meters, sensors and controllers into local or cloud-based monitoring platforms. Designed for light industrial environments, it provides a practical way to make equipment data more accessible.

Connect Existing Equipment

The GW211W-MQ supports Modbus RTU to MQTT, allowing compatible serial devices to share data with an MQTT platform.

CTC Union lists supported device types including PLCs, energy meters, IoT sensors, solar inverters, wind turbines, I/O modules and flow meters.

The gateway supports up to 32 MQTT topics, with adjustable register lengths, and can query up to four remote TCP devices. Topics organise the data published through MQTT so that connected systems can receive the readings they need.

Wired and Wireless Connections

The gateway includes:

  • One RS-232 serial port
  • One RS-422/485 serial port
  • One 10/100 Mbps Ethernet port
  • Built-in 2.4 GHz Wi-Fi, supporting 802.11 b/g/n

Ethernet and Wi-Fi give you a choice of network connection to suit your installation.

Straightforward Configuration

A browser-based interface lets you configure the gateway and its MQTT settings. CTC Union also provides a Windows IP utility to help with installation.

Additional features include firmware updates and a watchdog function.

Designed for Light Industrial Use

The GW211W-MQ has a compact plastic enclosure with wall mounting. It operates at temperatures from -20°C to 70°C and accepts a 9–32V DC power supply through a DC jack or terminal input.

It also includes ESD protection for serial signals and surge protection on the RS-422/485 interface.

Typical Uses

With compatible Modbus equipment and an MQTT monitoring platform, the gateway can help you:

  • Collect energy meter readings.
  • Monitor factory sensors and controllers.
  • Gather data from solar inverters and wind turbines.
  • Send flow meter readings to a central monitoring system.

Dashboards, data storage and analytics are provided by the connected platform.

Find Out More

Click here to find out more about the CTC Union GW211W-MQ,

To check compatibility with your equipment or request a quote call 01344 752222 or email sales@fibre.co.uk