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3Wire RS2MQTTx | 4G MQTT Gateway

3Wire Compact 4G IoT Gateway

RS2MQTTx Compact RS-485 to 4G Gateway for IoTWatt 4.0

3Wire RS2MQTTx is a compact industrial-grade 4G IoT gateway designed to connect RS-485 field devices such as power meters, PLCs, sensors and controllers to cloud-based IoT platforms.

As a streamlined version of the RS2MQTT series, RS2MQTTx provides essential RS-485 to cloud connectivity in a smaller DIN rail form factor. It is suitable for space-constrained panels, cost-sensitive projects, remote metering points and distributed energy monitoring applications.

For IoTWatt 4.0 projects, RS2MQTTx provides a practical cellular data collection layer where LAN or WiFi is not available. It supports MQTT and HTTP POST transmission over 2G / 4G networks with internal cache memory and watchdog operation for more reliable field deployment.

RS-485 Gateway 2G / 4G Connectivity MQTT HTTP POST 800-Record Cache Watchdog Circuit IoTWatt 4.0 Ready

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Product Type Compact industrial 4G IoT gateway for RS-485 devices

Connectivity RS-485 field data to cloud through 2G / 4G network

Protocols MQTT and HTTP POST for IoT platform integration

IoTWatt Value Connects remote meters to IoTWatt 4.0 without site LAN dependency

Overview: Compact RS-485 Cloud Connectivity

Many industrial and commercial sites need to collect data from RS-485 devices, but do not have reliable LAN or WiFi access at every metering point. This is common for remote panels, branch sites, small substations, pump rooms, outdoor panels and distributed assets.

RS2MQTTx solves this by using 2G / 4G mobile network connectivity to send RS-485 device data directly to cloud platforms. Its compact DIN rail form factor makes it suitable for panels where space and cost must be carefully managed.

Key positioning

RS2MQTTx is best positioned as a compact 4G IoT gateway for RS-485 meter data collection, remote energy monitoring, small-panel IoT deployment and IoTWatt 4.0 retrofit connectivity projects.

How RS2MQTTx Supports IoTWatt 4.0 Connectivity

IoTWatt 4.0 depends on reliable meter and equipment data. RS2MQTTx enables remote RS-485 devices to send data to the platform without requiring site LAN or WiFi infrastructure.

1. Field Devices RS-485 power meters, PLCs, sensors or controllers.

2. RS2MQTTx Collects serial data through RS-485 terminal connection.

3. Cellular Sends data over 2G / 4G GPRS / LTE network.

4. IoTWatt 4.0 Dashboards, tickets, reports and energy audit evidence.

5. Action Energy visibility, EECA reporting and operational improvements.

Key Features

485

RS-485 Serial Interface

Includes one RS-485 serial port using a 3.5mm terminal block with 485A, 485B and GND signal lines.

2G / 4G Mobile Network

Supports GPRS / LTE communication for cloud data transmission without fixed LAN dependency.

MQTT

MQTT Protocol Support

Suitable for IoT platforms and brokers that use MQTT for lightweight telemetry data transfer.

HTTP

HTTP POST Support

Can transmit collected device data to cloud systems using HTTP POST where required.

800

Internal Cache Memory

Stores up to 800 data records to help protect data continuity during temporary network outages.

Dedicated Watchdog Circuit

Watchdog operation supports stable and continuous gateway performance in field applications.

SIM

Micro SIM Support

Uses Micro SIM card format with 3V / 1.8V support. Nano SIM is not supported.

DIN

DIN Rail Mounting

Suitable for 35mm DIN rail installation in electrical panels and compact industrial enclosures.

RST

One-Touch Reset

Includes a push-button reset function for one-touch factory reset when required.

Hardware and Status Indication

Status Indicators

SYS, WORK, 4G LINK, TCP LINK, TXD and RXD indicators support local operation status checking during commissioning and troubleshooting.

Antenna Interface

Uses a 50Ω SMA Female antenna interface and supports stick antenna or suction cup antenna. Default antenna type is suction cup.

Panel Power Input

Power is connected through a 3.5mm terminal input, making it suitable for panel-based installation.

Compact Form Factor

Designed as a smaller and streamlined version of the RS2MQTT series for space-constrained deployment.

Enclosure Material

Uses flame-retardant alloy plastic enclosure material for practical industrial and commercial panel use.

Configuration and Polling

Device configuration and polling intervals can be managed through the serial interface.

Technical Highlights

Parameter	RS2MQTTx Specification
Product Type	Compact industrial-grade 4G IoT gateway
Device Connection	Serial-based devices such as RS-485 meters, PLCs, sensors and controllers
Network Transmission	2G / 4G, GPRS / LTE
Cloud Protocols	MQTT and HTTP POST
Serial Interface	1 x RS-485 via 3.5mm terminal block
Signal Lines	485A, 485B and GND
Cache Memory	Stores up to 800 data records
Watchdog	Dedicated watchdog circuit for stable operation
Status Indicators	SYS, WORK, 4G LINK, TCP LINK, TXD and RXD
Power Supply	3.5mm terminal input
SIM Card Voltage	3V / 1.8V
SIM Card Type	Micro SIM, 12 x 15 x 0.8mm
SIM Card Note	Nano SIM is not supported
Reset Function	Push-button for one-touch factory reset
Antenna Interface	50Ω SMA Female
Antenna Type	Stick antenna or suction cup antenna; default suction cup
Enclosure Material	Flame-retardant alloy plastic
Mounting	Suitable for 35mm DIN rail

Network deployment note

For cellular deployments, confirm SIM type, APN settings, mobile coverage, antenna location, data plan, MQTT / HTTP endpoint details and panel power supply before installation.

Typical Applications

IoTWatt 4.0 Remote Metering

Send RS-485 meter data to IoTWatt 4.0 for dashboards, analytics, EECA reporting and digital energy audit evidence.

Remote Energy Metering

Connect RS-485 power meters at remote or distributed sites to IoT platforms using 4G.

Small Panel Monitoring

Suitable for compact electrical panels where space is limited but cloud data access is required.

PLC and Sensor Data

Send serial data from PLCs, meters and sensors to cloud systems using MQTT or HTTP POST.

Multi-Site Monitoring

Deploy across branches, remote assets, substations, pump rooms or small facilities.

Retrofit IoT Projects

Useful where existing RS-485 devices need cloud connectivity without major communication infrastructure changes.

Integration with IoTWatt 4.0

RS2MQTTx is useful in IoTWatt 4.0 Digital Energy Audit and Energy Intelligence projects where RS-485 meters or sensors are located at remote panels, branch sites or areas without reliable LAN / WiFi connectivity. It enables compact cellular data collection directly from the field.

IoTWatt 4.0 Use	How RS2MQTTx Supports It
Remote Energy Dashboard	Publishes RS-485 meter data through 4G to support IoTWatt 4.0 dashboards and site visibility.
Digital Energy Audit	Provides access to meter load profile and equipment data for audit evidence and analytics.
EECA Reporting	Supports remote meter data collection for regulatory reporting workflows.
Multi-Site Monitoring	Allows distributed sites and small panels to send structured data to a central IoTWatt 4.0 platform.
Data Continuity	Internal cache memory stores up to 800 records during temporary network disruption.

IoTWatt 4.0 call to action

Use RS2MQTTx when RS-485 meter data needs to be collected from compact panels, remote points or distributed assets where LAN / WiFi is not available, but IoTWatt 4.0 dashboards, EECA reports and digital energy audit evidence are required.

Recommended Deployment Checklist

Confirm RS-485 device type, protocol and communication settings.
Confirm baud rate, parity, data bits, stop bits and slave addresses.
Confirm SIM card type, APN, data plan and mobile network coverage.
Confirm antenna type, antenna location and cellular signal strength.
Confirm MQTT broker or HTTP endpoint, topic structure and payload requirement.
Confirm polling interval, number of data points and cache behaviour during outage.
Confirm DIN rail space, enclosure arrangement and power supply connection.
Test end-to-end communication before handover to IoTWatt 4.0 or the host platform.

Related Keywords

3Wire RS2MQTTx Compact 4G IoT Gateway RS485 4G Gateway Industrial MQTT Gateway HTTP POST Gateway Remote Energy Metering DIN Rail IoT Gateway Micro SIM 4G Gateway IoTWatt 4.0 Ready Digital Energy Audit Connectivity EECA Meter Data Multi-Site Energy Monitoring

RS2MQTTx Operation Diagram

The diagram below shows the RS2MQTTx compact 4G IoT gateway operation concept, including RS-485 field device connection and cloud transmission.

RS2MQTTx compact 4G IoT gateway operation diagram

RS2MQTTx Supply, Setup and IoTWatt 4.0 Integration

Saturn Pyro supports 3Wire RS2MQTTx gateways for compact 4G RS-485 data collection, MQTT / HTTP publishing, remote meter monitoring, IoTWatt 4.0 digital energy audit projects, EECA reporting data collection and multi-site energy monitoring in Malaysia.

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