Services
3Wire RS2MQTT/RS2MQTT+ | 4G MQTT Gateway
3Wire RS2MQTT and RS2MQTT+ are industrial-grade 4G IoT gateways designed to connect serial and Ethernet-based devices such as PLCs, meters and sensors to cloud-based IoT platforms. Both models support serial communication. RS2MQTT+ includes an additional Ethernet port to support TCP/IP-based data polling. The gateway can poll required data from connected devices and transmit it to IoT platforms using MQTT or HTTP POST over 2G / 4G GPRS / LTE networks. Industrial sites often need to collect data from power meters, PLCs, sensors and other field devices, but fixed network infrastructure may not be available at every location. RS2MQTT and RS2MQTT+ solve this by connecting field devices directly to cloud platforms through 4G mobile networks. Designed for serial-based device connectivity using RS232 and RS485. Suitable for meters, PLCs and sensors that communicate over serial protocols. Includes the serial communication features of RS2MQTT, plus an additional Ethernet port for TCP/IP-based data polling. Both models support 4G cloud transmission through MQTT or HTTP POST, internal cache memory and watchdog operation for stable field deployment. Supports GPRS / LTE data transmission for cloud connectivity where fixed LAN or WiFi is not available. Transmit field data to MQTT brokers and IoT platforms for real-time monitoring, analytics and dashboards. Send collected data to cloud platforms through HTTP POST where MQTT is not used. DTL-645 and Modbus RTU parameters can be polled and converted into JSON format. Stores up to 800 data records to help prevent data loss during temporary 2G / 4G connection loss. Dedicated watchdog circuit supports stable and continuous 4G connectivity operation. Supports three cellular modes for broad 2G / 4G network compatibility. Supports baud rates from 300 bps to 921600 bps with 5 to 8 data bits. Terminal block for RS485 and DB9 connector for RS232 serial devices. Supports transparent serial transmission, Modbus RTU to Modbus TCP and MQTT protocol functions. Supports serial port AT command configuration for device setup and control. Power / 4G, Link and Active LED indicators provide local status visibility. Supports up to 32 slave devices connected on the RS485 bus. Can poll up to 200 parameters from connected serial devices. Heartbeat and Keep Alive functions help maintain reliable communication. Connect RS485 / RS232 power meters to cloud platforms for real-time energy data collection. Deploy across branches, distributed assets, pump rooms, substations or remote facilities. Send data from PLCs, meters and sensors to MQTT brokers, IoT cloud systems or monitoring dashboards. Enable retrofit IoT connectivity where existing serial devices need cloud access. Use RS2MQTT as a gateway to send meter and sensor data to IoTWatt 4.0 for analytics, reporting and energy audit workflows. Transmit data to MQTT Broker, IoTWatt, Cloud X, Cloud Y, Cloud Z or customer-selected cloud platforms. Use RS2MQTT to send data through 4G when LAN or WiFi is not available at the field location. Use RS2MQTT to connect Modbus RTU meters, PLCs and sensors to MQTT or HTTP-based platforms. Use RS2MQTT+ when an additional Ethernet interface is required for TCP/IP-based data polling. The following visual supports the RS2MQTT / RS2MQTT+ 4G IoT gateway, serial device polling, MQTT transmission and cloud platform connectivity information above. RS2MQTT / RS2MQTT+ Industrial 4G IoT Gateway Operation Diagram 3Wire RS2MQTT and RS2MQTT+ are industrial 4G IoT gateways for connecting serial and Ethernet-based devices to cloud platforms using MQTT or HTTP POST. With 4G CAT 1 support, RS232 / RS485 interfaces, Modbus RTU to Modbus TCP, JSON conversion, 800-record cache memory, watchdog operation and wide power input, RS2MQTT is suitable for remote industrial IoT, energy monitoring and multi-site data collection. Contact 3Wire / Saturn Pyro for product selection, SIM / antenna guidance and IoT integration support.Connect Serial and Ethernet Devices to Cloud IoT Platforms
4G MQTT / HTTP POST gateway for PLCs, meters, sensors and industrial field devices.
Why RS2MQTT?
RS2MQTT vs RS2MQTT+
RS2MQTT
RS2MQTT+
Common Capability
IoT Gateway Capabilities
2G / 4G Connectivity
MQTT Protocol
HTTP POST
JSON Data Conversion
Internal Cache Memory
Watchdog Circuit
Key Features
TDD-LTE, FDD-LTE and GSM
High Serial Baud Rate
RS232 / RS485 Interface
Modbus RTU to Modbus TCP
AT Command Configuration
LED Indicators
Up to 32 RS485 Slaves
Up to 200 Parameters
Heartbeat and Keep Alive
Typical Applications
Remote Energy Metering
Multi-Site Monitoring
PLC and Sensor Data
Industrial IoT Projects
IoTWatt 4.0 Integration
Cloud Platform Integration
Technical Highlights
Parameter
RS2MQTT / RS2MQTT+ Specification
Product Type
Industrial-grade 4G IoT gateway
Models
RS2MQTT and RS2MQTT+
RS2MQTT+
Includes additional Ethernet port for TCP/IP-based data polling
Device Connection
Serial and Ethernet-based devices such as PLCs, meters and sensors
Cellular Modes
TDD-LTE, FDD-LTE and GSM
4G CAT 1 Bands
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 / 85.6 Kbps uplink
SIM Card
3V and 1.8V, Standard SIM
Antenna
50Ω / SMA type
Serial Interface
RS485 terminal block and RS232 DB9
Serial Baud Rate
300 bps to 921600 bps
Data Bits
5 bits to 8 bits
Parity
None, Odd, Even, Mark, Space
Protocols
MQTT and HTTP POST
Modbus Function
Serial transparent transmission and Modbus RTU to Modbus TCP
JSON Conversion
DTL-645 and Modbus RTU parameters can be polled and converted to JSON format
RS485 Slave Capacity
Up to 32 slaves on RS485 bus
Parameter Polling
Up to 200 parameters polled
Cache Memory
Stores up to 800 data records
Configuration
Serial port configuration and 3Wire Device Management Software
Power Supply
9VDC to 48VDC, DC jack
Power Requirement
9–24V DC, 80mA @ 12V, 40mA @ 24V
Wiring
Plug-in screw terminal, accepts AWG12 to AWG30 wires
Operating Temperature
-40°C to 85°C
Storage Temperature
-45°C to 125°C
Humidity
5% to 95% RH
Dimensions
94mm (L) × 65mm (W) × 25mm (H)
Where RS2MQTT Fits
When Fixed Network Is Not Available
When Existing Serial Devices Need Cloud Access
When Ethernet Polling Is Required
RS2MQTT Operation Diagram
.png)
Product Summary