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.
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.
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.
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.
Includes one RS-485 serial port using a 3.5mm terminal block with 485A, 485B and GND signal lines.
Supports GPRS / LTE communication for cloud data transmission without fixed LAN dependency.
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 continuity during temporary network outages.
Watchdog operation supports stable and continuous 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 when required.
SYS, WORK, 4G LINK, TCP LINK, TXD and RXD indicators support local operation status checking during commissioning and troubleshooting.
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.
Designed as a smaller and streamlined version of the RS2MQTT series for space-constrained deployment.
Uses flame-retardant alloy plastic enclosure material for practical industrial and commercial panel use.
Device configuration and polling intervals can be managed through the serial interface.
| 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 |
For cellular deployments, confirm SIM type, APN settings, mobile coverage, antenna location, data plan, MQTT / HTTP endpoint details and panel power supply before installation.
Send RS-485 meter data to IoTWatt 4.0 for dashboards, analytics, EECA reporting and digital energy audit evidence.
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.
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. |
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.
The diagram below shows the RS2MQTTx compact 4G IoT gateway operation concept, including RS-485 field device connection and cloud transmission.
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RS2MQTTx compact 4G IoT gateway operation diagram
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.
Malaysia
