Details
RS2MQTT / RS2MQTT+ 4G MQTT Gateway
3Wire RS2MQTT and RS2MQTT+ are industrial 4G IoT gateways designed to connect field devices such as PLCs, power meters, energy meters, sensors, protection relays, controllers and remote I/O modules to IoT platforms.
The gateways poll data from RS232, RS485 or RS422 devices and transmit the data to cloud or server platforms using MQTT or HTTP POST over GPRS / LTE networks. RS2MQTT is focused on serial connectivity, while RS2MQTT+ adds Ethernet for TCP/IP-based polling applications.
Product Overview
RS2MQTT is designed for industrial sites that need to collect data from existing serial devices and send it to an IoT platform without installing a full PLC, industrial PC or local server.
It can poll Modbus RTU and DLT-645 parameters, convert selected data into JSON format, and publish it through MQTT or send it through HTTP POST. Configuration can be managed through serial interface and 3Wire Device Management Software.
Why RS2MQTT Matters
Many sites already have useful data inside Modbus meters, PLCs and serial devices. RS2MQTT helps bring that data into the cloud without replacing the field equipment.
- Industrial IoT retrofit
- Remote meter reading
- 4G backhaul
- Modbus polling
- MQTT publishing
- JSON payload
- IoTWatt gateway
Typical Data Flow
RS2MQTT acts as the bridge between field devices and the IoT platform. It collects data locally from meters, PLCs or sensors, then sends the data to MQTT brokers, IoTWatt 4.0 or other cloud platforms through the cellular network.
Key Features at a Glance
RS2MQTT vs RS2MQTT+
| Item | RS2MQTT | RS2MQTT+ |
|---|---|---|
| Main Function | 4G gateway for serial RS232 / RS485 / RS422 devices. | 4G gateway for serial devices plus Ethernet / TCP-IP based devices. |
| Field Interface | RS485 / RS422 terminal and RS232 DB9. | RS485 / RS422 terminal, RS232 DB9 and Ethernet port. |
| Typical Use | Power meters, PLCs, relays and sensors using serial communication. | Serial devices plus meters, PLCs or equipment using TCP/IP polling. |
| Cloud Communication | MQTT and HTTP POST over GPRS / LTE. | MQTT and HTTP POST over GPRS / LTE. |
| Best Fit | Single RS485 network or serial device retrofit. | Mixed serial and Ethernet-based monitoring sites. |
Technical Specifications Summary
| Category | Specification |
|---|---|
| Product Type | Industrial 4G IoT gateway for MQTT / HTTP data transmission. |
| Cellular Modes | 4G CAT 1; supports 2G and 4G; FDD LTE B1 / B3 / B5 / B8; TDD LTE B34 / B38 / B39 / B40 / B41; GSM B3 / B8. |
| Transmission Rate | LTE: 10 Mbps downlink, 5 Mbps uplink; GPRS: 85.6 Kbps downlink and uplink. |
| SIM Card | 3V and 1.8V standard SIM. |
| Antenna | 50 Ohm / SMA type. |
| Serial Interface | RS485 / RS422 terminal and RS232 DB9. |
| Serial Baud Rate | 300 bps to 921600 bps. |
| Protocols | MQTT, HTTP POST, serial transparent transmission, Modbus RTU to Modbus TCP and Modbus RTU to MQTT / JSON. |
| Device Polling | Up to 32 slaves on RS485 bus and up to 200 parameters polled. |
| Internal Cache | Up to 800 data records. |
| Configuration | 3Wire Device Management Software and serial AT command configuration. |
| Power Supply | 9–48 VDC wide voltage input, 5.5 mm plug and 2-way pluggable terminal block adaptor. |
| Typical Current | 80 mA at 12 VDC; 40 mA at 24 VDC. |
| LED Indicators | Power, 4G, Link and Active LED indicators. |
| Dimensions | 94 mm L x 65 mm W x 25 mm H. |
| Operating Temperature | -40°C to +85°C. |
| Humidity | 5% to 95% RH. |
Supported Data Architecture
| Layer | Description |
|---|---|
| Field Device Layer | Power meters, energy meters, PLCs, sensors, relays, controllers and RS485 / RS232 / RS422 or TCP/IP devices. |
| Gateway Layer | RS2MQTT / RS2MQTT+ polls data, converts it into the required format and stores cached records during network outage. |
| Network Layer | 4G / GPRS / LTE cellular communication provides data backhaul from remote sites. |
| Broker / Server Layer | MQTT broker or HTTP endpoint receives the data for processing and storage. |
| Application Layer | IoTWatt 4.0, cloud dashboards, mobile applications, reporting tools, alerts and analytics use the collected data. |
Applications and Best-Fit Sites
- Energy monitoring
- Remote meter reading
- Machine monitoring
- Industrial IoT retrofit
- Fuel stations
- Pump stations
- Substations
- Remote electrical rooms
- Warehouses
- Commercial buildings
- Distributed branches
- IoTWatt 4.0 projects
Why RS2MQTT for Industrial IoT?
Integration with IoTWatt 4.0
RS2MQTT is one of the practical gateway options for IoTWatt 4.0 deployment. It can collect meter and equipment data from remote panels, substations, pump stations, fuel stations, industrial plants and commercial buildings, then transmit the data to IoTWatt 4.0 for dashboards, analytics, alerts and reports.
- RS485 Modbus meters
- 4G energy data upload
- Remote panel monitoring
- Multi-site dashboards
- Demand analytics
- Digital energy audit data
- EECA reporting support
- Alarm notifications
- MQTT data pipeline
- Cloud-ready integration
Recommended Deployment Checklist
- Confirm field protocol
- Confirm RS485 wiring
- Confirm slave IDs
- Confirm baud rate and parity
- Confirm register map
- Confirm number of devices
- Confirm total polling parameters
- Confirm SIM and data plan
- Check APN settings
- Check cellular signal strength
- Confirm MQTT broker / HTTP endpoint
- Confirm topic and payload format
- Confirm antenna location
- Test data before commissioning
RS2MQTT Supply, Configuration and IoTWatt 4.0 Integration
Saturn Pyro supports 3Wire RS2MQTT and RS2MQTT+ gateways for industrial IoT, energy monitoring, remote meter reading, Modbus-to-MQTT conversion, multi-site monitoring, IoTWatt 4.0 dashboards and digital energy audit projects in Malaysia.
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