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3Wire RS2MQTTx | 4G MQTT Gateway
3Wire RS2MQTTx is a compact industrial-grade 4G IoT gateway designed to connect serial-based devices such as PLCs, meters and sensors to cloud-based IoT platforms. As a streamlined version of the RS2MQTT series, RS2MQTTx offers essential IoT gateway features in a smaller form factor for space-constrained and cost-sensitive installations. It supports data transmission over 2G / 4G networks using MQTT or HTTP POST, with internal cache memory and watchdog operation for reliable field deployment. 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. RS2MQTTx solves this by using 2G / 4G mobile network connectivity to send serial device data directly to cloud platforms. It is especially useful for remote meters, branch sites, small panels, retrofit monitoring points and locations where wired communication is difficult or costly. Supports data transmission over GPRS / LTE networks for cloud-based monitoring without fixed LAN dependency. Transmits field data to IoT platforms using MQTT or HTTP POST protocols. Connects RS-485 serial devices such as meters, PLCs and sensors through a 3.5mm terminal block. Includes one RS-485 serial port using a 3.5mm terminal block with 485A, 485B and GND signal lines. Supports 2G / 4G communication for remote data transmission to cloud platforms. Suitable for IoT platforms and brokers that use MQTT for lightweight telemetry data transfer. Can transmit collected device data to cloud systems using HTTP POST where required. Stores up to 800 data records to help protect data integrity during temporary network outages. Watchdog operation supports stable and uninterrupted gateway performance in field applications. Uses Micro SIM card format with 3V / 1.8V support. Nano SIM is not supported. Suitable for 35mm DIN rail installation in electrical panels and compact industrial enclosures. Includes a push-button reset function for one-touch factory reset. Includes SYS, WORK, 4G LINK, TCP LINK, TXD and RXD indicators for local operation status checking. Uses a 50Ω SMA Female antenna interface and supports stick antenna or suction cup antenna. Default antenna type is suction cup. Power is connected through a 3.5mm terminal input, making it suitable for panel-based installation. Uses flame-retardant alloy plastic enclosure material for practical industrial use. Designed as a smaller and streamlined version of the RS2MQTT series for compact deployment. Device configuration and polling intervals can be managed through the serial interface. Connect RS-485 power meters at remote or distributed sites to IoT platforms using 4G. Suitable for compact electrical panels where space is limited but cloud data access is required. Send serial data from PLCs, meters and sensors to cloud systems using MQTT or HTTP POST. Deploy across branches, remote assets, substations, pump rooms or small facilities. Useful where existing RS-485 devices need cloud connectivity without major communication infrastructure changes. Can be used as a practical gateway for sending meter and sensor data to IoTWatt 4.0 for analytics and reporting. Use RS2MQTTx to connect RS-485 devices to cloud platforms through 4G mobile network connectivity. Use RS2MQTTx where the installation panel or enclosure requires a compact IoT gateway. Use RS2MQTTx where essential IoT gateway functions are required in a streamlined and cost-effective package. The following visual supports the RS2MQTTx compact 4G IoT gateway, RS-485 device connection and cloud transmission information above. RS2MQTTx Compact 4G IoT Gateway Operation Diagram 3Wire RS2MQTTx is a compact industrial-grade 4G IoT gateway for connecting RS-485 devices such as PLCs, meters and sensors to cloud platforms using MQTT or HTTP POST. With 2G / 4G connectivity, internal cache memory for up to 800 data records, watchdog operation, Micro SIM support, SMA antenna interface and DIN rail mounting, RS2MQTTx is suitable for compact and reliable industrial IoT deployment. Contact 3Wire / Saturn Pyro for product selection, SIM / antenna guidance and IoT integration support.Compact RS-485 to 4G IoT Gateway
MQTT and HTTP POST connectivity for industrial meters, PLCs and sensors.
Why RS2MQTTx?
Compact IoT Gateway for Practical Field Deployment
2G / 4G Connectivity
MQTT / HTTP POST
RS-485 Field Device Access
Key Features
RS-485 Serial Interface
Mobile Network IoT Access
MQTT Protocol Support
HTTP POST Support
Internal Cache Memory
Dedicated Watchdog Circuit
Micro SIM Support
DIN Rail Mounting
One-Touch Reset
Hardware and Status Indication
Status Indicators
Antenna Interface
Power Input
Enclosure Material
Compact Form Factor
Configuration and Polling
Typical Applications
Remote Energy Metering
Small Panel Monitoring
PLC and Sensor Data
Multi-Site Monitoring
Retrofit IoT Projects
IoTWatt 4.0 Integration
Technical Highlights
Parameter
RS2MQTTx Specification
Product Type
Compact industrial-grade 4G IoT gateway
Device Connection
Serial-based devices such as PLCs, meters and sensors
Network Transmission
2G / 4G, GPRS / LTE
Cloud Protocols
MQTT and HTTP POST
Serial Interface
RS-485 via 3.5mm terminal block
Signal Lines
485A, 485B, GND
Number of Serial Ports
1 × RS-485
Cache Memory
Stores up to 800 data records
Watchdog
Dedicated watchdog circuit for stable operation
Status Indicators
SYS, WORK, 4G LINK, TCP LINK, TXD, RXD
Power Supply
3.5mm terminal input
SIM Card Voltage
3V / 1.8V
SIM Card Type
Micro SIM, 12 × 15 × 0.8mm
SIM Card Note
Nano SIM 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
Where RS2MQTTx Fits
When LAN or WiFi Is Not Available
When Space Is Limited
When Cost Matters
RS2MQTTx Operation Diagram
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Product Summary