3WIRE RS2MQTT — 4G Modbus to MQTT IoT Gateway
Product Description
The 3WIRE RS2MQTT is an industrial Modbus-to-MQTT IoT gateway designed to connect existing serial devices and electrical equipment to modern cloud, IoT and remote monitoring platforms. It acts as a communication bridge between Modbus RTU devices over RS-485 or RS-232 and MQTT-based systems, allowing data from meters, analysers, sensors, controllers and other industrial equipment to be collected and published remotely.
The RS2MQTT is particularly useful when an installation already contains Modbus-enabled equipment but needs to bring that data into a cloud platform, IoT application, energy management system or remote monitoring environment without replacing the existing field devices.
Operating as a Modbus master, the gateway polls connected Modbus RTU slave devices, reads their configured registers and converts the collected serial data into MQTT messages. These messages can then be published to a compatible MQTT broker, cloud service or IoT platform.
The gateway supports both RS-485 and RS-232 serial communication, making it suitable for a broad range of legacy and modern industrial devices. RS-485 is particularly common for multi-drop networks containing multiple energy meters, power meters, environmental sensors, controllers and industrial instruments.
The RS2MQTT includes 4G cellular connectivity, allowing remote installations to communicate without requiring an existing local Ethernet network or fixed internet connection. A SIM card and cellular antenna can provide the communication path between an isolated site and the remote MQTT broker.
For sites where wired networking is available, the gateway also provides an RJ45 Ethernet connection, giving installers the option of using an existing network instead of cellular communication.
The combination of 4G, Ethernet, RS-485, RS-232 and MQTT makes the RS2MQTT suitable for bridging industrial serial communications with modern IoT infrastructure. It can be deployed at remote sites, temporary installations, infrastructure locations and facilities where installing a conventional network connection would be difficult or impractical.
The gateway operates from a wide 9–48 VDC power supply, making it suitable for integration into industrial control panels, automation cabinets and equipment enclosures with different DC supply voltages.
Front-panel status indicators for activity, link and 4G connectivity provide useful visibility into the gateway's operating condition. This allows installers and maintenance teams to quickly determine whether the serial bus, network connection and cellular link are operating as expected.
With its compact housing and wide-range DC power input, the RS2MQTT can be installed alongside existing industrial communication equipment without requiring major changes to the system architecture.
Typical applications include remote energy monitoring, smart metering, industrial IoT, Modbus data acquisition, cloud-based meter monitoring, remote equipment monitoring, utility monitoring, solar monitoring, water and wastewater monitoring, building management systems and SCADA data integration.
Rather than replacing existing Modbus devices, the RS2MQTT provides a way to bring legacy serial equipment online and expose its data to MQTT-compatible platforms.
Key Features
3WIRE RS2MQTT
Modbus-to-MQTT gateway
Industrial IoT gateway
4G cellular gateway
Modbus RTU gateway
RS-485 gateway
RS-232 gateway
MQTT gateway
Modbus master
MQTT publisher
Serial-to-cloud gateway
Remote data acquisition
4G cellular connectivity
RJ45 Ethernet
SIM card connectivity
External cellular antenna
9–48 VDC power supply
DIN/panel installation
Status LEDs
Remote monitoring
Cloud data integration
IoT connectivity
Technical Highlights
Specification Details
Product 3WIRE RS2MQTT
Function Modbus RTU to MQTT gateway
Serial Interfaces RS-485 / RS-232
Serial Protocol Modbus RTU
Gateway Role Modbus Master
Cloud Protocol MQTT
Cellular 4G
Wired Network RJ45 Ethernet
Power Supply 9–48 VDC
Connectivity 4G + Ethernet
Typical Devices Meters, analysers, sensors, controllers & industrial equipment
How It Works
The RS2MQTT sits between the field devices and the cloud or IoT platform.
1. Connect Modbus Devices
Energy meters, power analysers, sensors and other Modbus RTU devices connect through the RS-485 or RS-232 interface.
2. Poll Device Data
The RS2MQTT operates as the Modbus master and retrieves configured data from the connected slave devices.
3. Convert the Data
The gateway translates the serial Modbus data into MQTT messages.
4. Connect Over 4G or Ethernet
Data can be transmitted using the integrated 4G cellular connection or available RJ45 Ethernet network.
5. Publish to an MQTT Broker
MQTT messages are sent to a compatible broker, cloud platform or IoT application where the data can be stored, visualised, analysed or used for automation.
This makes the RS2MQTT a practical serial-to-cloud communication gateway for installations where replacing existing meters or controllers would be unnecessary.
Applications
The RS2MQTT can be used for:
Industrial IoT
IIoT connectivity
Modbus data acquisition
Remote energy monitoring
Smart energy monitoring
Remote meter monitoring
Energy meter connectivity
Power meter connectivity
Power analyser connectivity
Building management systems
BMS integration
SCADA integration
Cloud monitoring
MQTT data acquisition
Remote equipment monitoring
Industrial automation
Utility monitoring
Solar monitoring
Renewable energy monitoring
Water monitoring
Wastewater monitoring
Pump station monitoring
Telecom infrastructure monitoring
Remote infrastructure monitoring
Generator monitoring
Machine monitoring
Equipment monitoring
Legacy equipment connectivity
Ideal Use Cases
Remote Energy Metering
Connect existing Modbus energy meters to a cloud platform over 4G without installing a new wired internet connection at the meter location.
Industrial IoT
Bring existing RS-485 and RS-232 industrial equipment into an MQTT-based IIoT architecture.
Remote Sites
Use 4G connectivity to monitor equipment at locations where fixed Ethernet or site networking is unavailable.
Building Management
Collect data from energy meters and other Modbus devices and publish it to a BMS, energy platform or cloud application.
Solar & Renewable Energy
Connect Modbus-enabled meters, analysers and controllers at solar or renewable-energy installations to remote monitoring systems.
Water & Wastewater
Monitor pumps, meters, controllers and other Modbus-enabled equipment at distributed water infrastructure sites.
Legacy Equipment Modernisation
Add cloud and IoT connectivity to existing Modbus equipment without replacing the field devices themselves.
4G Connectivity for Remote Sites
One of the key advantages of the RS2MQTT is its integrated 4G cellular communication.
Traditional industrial gateways may depend on an Ethernet connection being available at the installation. This can become difficult at remote pump stations, solar farms, utility sites, temporary installations and distributed infrastructure.
With 4G connectivity, the RS2MQTT can communicate with a remote MQTT broker using a SIM card and cellular network, reducing the dependency on local site networking.
For installations where Ethernet is already available, the RJ45 port provides a wired networking alternative.
Modbus + MQTT
The RS2MQTT connects two very different parts of an industrial system:
Modbus RTU is commonly used at the field level to communicate with meters, sensors, analysers, controllers and other equipment.
MQTT is widely used for lightweight messaging between devices, servers, cloud platforms and IoT applications.
The RS2MQTT effectively acts as the bridge between these two environments, allowing existing Modbus devices to become data sources for modern MQTT-based IoT systems.
SEO Keywords
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Long-Tail Search Terms
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Modbus to MQTT converter with 4G
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Modbus RTU MQTT bridge
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Modbus cloud gateway for remote sites
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RS-485 IoT gateway with MQTT
RS-485 Modbus to cloud gateway
Modbus energy meter cloud gateway
MQTT gateway for BMS integration
MQTT gateway for SCADA integration
Modbus to MQTT gateway for solar monitoring
4G Modbus gateway for water monitoring
industrial serial communication gateway
Meta Description
3WIRE RS2MQTT is a 4G Modbus-to-MQTT gateway connecting RS-485 and RS-232 Modbus RTU devices to cloud and IoT platforms via MQTT, Ethernet or cellular networks.
Saturn Pyro
44 & 44A, Jalan Palma Rafis 1, Taman Dato Chellam, 81800 Ulu Tiram, Johor
Tel: 07 8660 510 Fax: 07 8660 511 Email: enquiry@saturnpyro.com
The 3WIRE RS2MQTT is an industrial Modbus-to-MQTT IoT gateway designed to connect existing serial devices and electrical equipment to modern cloud, IoT and remote monitoring platforms. It acts as a communication bridge between Modbus RTU devices over RS-485 or RS-232 and MQTT-based systems, allowing data from meters, analysers, sensors, controllers and other industrial equipment to be collected and published remotely.
The RS2MQTT is particularly useful when an installation already contains Modbus-enabled equipment but needs to bring that data into a cloud platform, IoT application, energy management system or remote monitoring environment without replacing the existing field devices.
Operating as a Modbus master, the gateway polls connected Modbus RTU slave devices, reads their configured registers and converts the collected serial data into MQTT messages. These messages can then be published to a compatible MQTT broker, cloud service or IoT platform.
The gateway supports both RS-485 and RS-232 serial communication, making it suitable for a broad range of legacy and modern industrial devices. RS-485 is particularly common for multi-drop networks containing multiple energy meters, power meters, environmental sensors, controllers and industrial instruments.
The RS2MQTT includes 4G cellular connectivity, allowing remote installations to communicate without requiring an existing local Ethernet network or fixed internet connection. A SIM card and cellular antenna can provide the communication path between an isolated site and the remote MQTT broker.
For sites where wired networking is available, the gateway also provides an RJ45 Ethernet connection, giving installers the option of using an existing network instead of cellular communication.
The combination of 4G, Ethernet, RS-485, RS-232 and MQTT makes the RS2MQTT suitable for bridging industrial serial communications with modern IoT infrastructure. It can be deployed at remote sites, temporary installations, infrastructure locations and facilities where installing a conventional network connection would be difficult or impractical.
The gateway operates from a wide 9–48 VDC power supply, making it suitable for integration into industrial control panels, automation cabinets and equipment enclosures with different DC supply voltages.
Front-panel status indicators for activity, link and 4G connectivity provide useful visibility into the gateway's operating condition. This allows installers and maintenance teams to quickly determine whether the serial bus, network connection and cellular link are operating as expected.
With its compact housing and wide-range DC power input, the RS2MQTT can be installed alongside existing industrial communication equipment without requiring major changes to the system architecture.
Typical applications include remote energy monitoring, smart metering, industrial IoT, Modbus data acquisition, cloud-based meter monitoring, remote equipment monitoring, utility monitoring, solar monitoring, water and wastewater monitoring, building management systems and SCADA data integration.
Rather than replacing existing Modbus devices, the RS2MQTT provides a way to bring legacy serial equipment online and expose its data to MQTT-compatible platforms.
Key Features
3WIRE RS2MQTT
Modbus-to-MQTT gateway
Industrial IoT gateway
4G cellular gateway
Modbus RTU gateway
RS-485 gateway
RS-232 gateway
MQTT gateway
Modbus master
MQTT publisher
Serial-to-cloud gateway
Remote data acquisition
4G cellular connectivity
RJ45 Ethernet
SIM card connectivity
External cellular antenna
9–48 VDC power supply
DIN/panel installation
Status LEDs
Remote monitoring
Cloud data integration
IoT connectivity
Technical Highlights
Specification Details
Product 3WIRE RS2MQTT
Function Modbus RTU to MQTT gateway
Serial Interfaces RS-485 / RS-232
Serial Protocol Modbus RTU
Gateway Role Modbus Master
Cloud Protocol MQTT
Cellular 4G
Wired Network RJ45 Ethernet
Power Supply 9–48 VDC
Connectivity 4G + Ethernet
Typical Devices Meters, analysers, sensors, controllers & industrial equipment
How It Works
The RS2MQTT sits between the field devices and the cloud or IoT platform.
1. Connect Modbus Devices
Energy meters, power analysers, sensors and other Modbus RTU devices connect through the RS-485 or RS-232 interface.
2. Poll Device Data
The RS2MQTT operates as the Modbus master and retrieves configured data from the connected slave devices.
3. Convert the Data
The gateway translates the serial Modbus data into MQTT messages.
4. Connect Over 4G or Ethernet
Data can be transmitted using the integrated 4G cellular connection or available RJ45 Ethernet network.
5. Publish to an MQTT Broker
MQTT messages are sent to a compatible broker, cloud platform or IoT application where the data can be stored, visualised, analysed or used for automation.
This makes the RS2MQTT a practical serial-to-cloud communication gateway for installations where replacing existing meters or controllers would be unnecessary.
Applications
The RS2MQTT can be used for:
Industrial IoT
IIoT connectivity
Modbus data acquisition
Remote energy monitoring
Smart energy monitoring
Remote meter monitoring
Energy meter connectivity
Power meter connectivity
Power analyser connectivity
Building management systems
BMS integration
SCADA integration
Cloud monitoring
MQTT data acquisition
Remote equipment monitoring
Industrial automation
Utility monitoring
Solar monitoring
Renewable energy monitoring
Water monitoring
Wastewater monitoring
Pump station monitoring
Telecom infrastructure monitoring
Remote infrastructure monitoring
Generator monitoring
Machine monitoring
Equipment monitoring
Legacy equipment connectivity
Ideal Use Cases
Remote Energy Metering
Connect existing Modbus energy meters to a cloud platform over 4G without installing a new wired internet connection at the meter location.
Industrial IoT
Bring existing RS-485 and RS-232 industrial equipment into an MQTT-based IIoT architecture.
Remote Sites
Use 4G connectivity to monitor equipment at locations where fixed Ethernet or site networking is unavailable.
Building Management
Collect data from energy meters and other Modbus devices and publish it to a BMS, energy platform or cloud application.
Solar & Renewable Energy
Connect Modbus-enabled meters, analysers and controllers at solar or renewable-energy installations to remote monitoring systems.
Water & Wastewater
Monitor pumps, meters, controllers and other Modbus-enabled equipment at distributed water infrastructure sites.
Legacy Equipment Modernisation
Add cloud and IoT connectivity to existing Modbus equipment without replacing the field devices themselves.
4G Connectivity for Remote Sites
One of the key advantages of the RS2MQTT is its integrated 4G cellular communication.
Traditional industrial gateways may depend on an Ethernet connection being available at the installation. This can become difficult at remote pump stations, solar farms, utility sites, temporary installations and distributed infrastructure.
With 4G connectivity, the RS2MQTT can communicate with a remote MQTT broker using a SIM card and cellular network, reducing the dependency on local site networking.
For installations where Ethernet is already available, the RJ45 port provides a wired networking alternative.
Modbus + MQTT
The RS2MQTT connects two very different parts of an industrial system:
Modbus RTU is commonly used at the field level to communicate with meters, sensors, analysers, controllers and other equipment.
MQTT is widely used for lightweight messaging between devices, servers, cloud platforms and IoT applications.
The RS2MQTT effectively acts as the bridge between these two environments, allowing existing Modbus devices to become data sources for modern MQTT-based IoT systems.
SEO Keywords
3WIRE RS2MQTT, RS2MQTT, RS2MQTT gateway, 3WIRE Modbus MQTT gateway, Modbus to MQTT gateway, Modbus MQTT converter, Modbus RTU to MQTT, Modbus to MQTT converter, Modbus gateway, MQTT gateway, industrial IoT gateway, IIoT gateway, IoT gateway, 4G IoT gateway, 4G Modbus gateway, cellular Modbus gateway, RS-485 MQTT gateway, RS-232 MQTT gateway, RS-485 to MQTT, RS-232 to MQTT, serial to MQTT gateway, serial-to-cloud gateway, Modbus serial gateway, Modbus master gateway, MQTT Modbus bridge, Modbus cloud gateway, Modbus data acquisition gateway, remote Modbus monitoring, Modbus remote monitoring, Modbus cloud connectivity, industrial communication gateway, industrial protocol gateway, remote telemetry gateway, 4G Modbus RTU gateway, MQTT data logger, Modbus data logger, energy meter IoT gateway, smart meter MQTT gateway, industrial MQTT gateway.
Long-Tail Search Terms
3WIRE RS2MQTT Modbus to MQTT gateway
RS2MQTT 4G Modbus MQTT gateway
Modbus RTU to MQTT 4G gateway
RS-485 to MQTT industrial gateway
RS-232 to MQTT converter
4G Modbus RTU gateway
cellular Modbus to MQTT gateway
Modbus to MQTT converter with 4G
industrial IoT gateway for Modbus devices
Modbus MQTT gateway for energy meters
Modbus gateway for remote energy monitoring
RS-485 gateway for cloud monitoring
Modbus serial to cloud gateway
Modbus RTU cloud connectivity
Modbus data acquisition over 4G
remote Modbus monitoring gateway
MQTT gateway for energy meters
MQTT gateway for power meters
MQTT gateway for power analysers
4G gateway for remote energy meters
Modbus gateway with Ethernet and 4G
industrial gateway with RS-485 and MQTT
Modbus master MQTT gateway
Modbus RTU MQTT bridge
serial device to MQTT gateway
legacy Modbus equipment IoT gateway
remote industrial equipment monitoring gateway
Modbus cloud gateway for remote sites
4G IoT gateway for industrial equipment
RS-485 IoT gateway with MQTT
RS-485 Modbus to cloud gateway
Modbus energy meter cloud gateway
MQTT gateway for BMS integration
MQTT gateway for SCADA integration
Modbus to MQTT gateway for solar monitoring
4G Modbus gateway for water monitoring
industrial serial communication gateway
Meta Description
3WIRE RS2MQTT is a 4G Modbus-to-MQTT gateway connecting RS-485 and RS-232 Modbus RTU devices to cloud and IoT platforms via MQTT, Ethernet or cellular networks.
Saturn Pyro
44 & 44A, Jalan Palma Rafis 1, Taman Dato Chellam, 81800 Ulu Tiram, Johor
Tel: 07 8660 510 Fax: 07 8660 511 Email: enquiry@saturnpyro.com
Sep 09,2026