Description
3Wire Industrial WiFi / LAN IoT Gateway
RS2WLAN Serial Device Server & Modbus Gateway
3Wire RS2WLAN is an industrial-grade WiFi / LAN IoT gateway designed to connect serial and Ethernet-based field devices such as PLCs, power meters, energy meters, sensors, controllers and Modbus devices to SCADA, BMS, EMS, IoT platforms and cloud-based monitoring systems.
RS2WLAN can poll data from connected serial devices and transmit it using MQTT or HTTP POST over WiFi or LAN. It can also operate as a serial device server, Modbus TCP gateway, Virtual COM bridge, TCP server, TCP client, UDP device or paired communication bridge for SCADA and BMS integration.
Network WiFi 802.11b/g and 10/100Mbps Ethernet
Field Interface RS232 / RS485 / RS422
IoT Protocols MQTT and HTTP POST
Gateway Function Modbus RTU to Modbus TCP conversion
Product Overview
RS2WLAN provides a practical bridge between field devices and modern IP-based systems. It is especially useful when existing equipment communicates through RS485, RS232 or RS422, but the site requires WiFi / LAN connectivity, remote SCADA access, cloud dashboards, MQTT data publishing or HTTP data submission.
The gateway supports both local industrial communication and IoT data transmission. It can be used to connect Modbus RTU devices to Modbus TCP systems, expose serial devices through Virtual COM, or collect data and send it to IoTWatt 4.0 and other cloud platforms.
Positioning: Industrial WiFi / LAN serial device server and IoT gateway for RS232 / RS485 / RS422 devices, Modbus RTU-to-TCP conversion, MQTT data publishing and SCADA / BMS integration.
Typical IoT Data Flow
RS2WLAN collects data from field devices through RS232, RS485, RS422, TCP/IP or Ethernet, then sends it over WiFi / LAN to an MQTT broker, HTTP endpoint, IoTWatt platform or other cloud application.
1 Field Device
2 RS485 / RS232 / TCP/IP
3 RS2WLAN Gateway
4 WiFi / LAN
5 MQTT / HTTP / IoTWatt
Key Features
WiFi / LAN IoT Gateway
Links serial and Ethernet devices to an IEEE 802.11b/g WiFi network with simultaneous access over Ethernet and WiFi.
MQTT and HTTP POST
Supports MQTT and HTTP POST data transmission for IoT platforms and cloud-based monitoring systems.
Modbus RTU Data Polling
Polls DLT-645 and Modbus RTU parameters and converts selected data into JSON format.
RS232 / RS485 / RS422
Provides RS485 / RS422 terminal interface and RS232 DB9 interface for common industrial field devices.
Modbus TCP Gateway
Converts Modbus RTU to Modbus TCP for integration with PLC, SCADA, BMS, EMS and monitoring systems.
STA and AP Mode
Operates in STA Mode to connect to a wireless router or AP Mode to connect directly to WiFi devices, including mobile phones.
Industrial Protection
Includes 1500V optical isolation on RS485 / RS422 data lines and 2kV surge protection on Ethernet port.
Virtual COM Support
Supports Virtual Port operation using 3Wire ComPort Emulator software.
Wide Power Input
Supports 9–48VDC with dual voltage input through screw terminal or DC jack.
Supported Operating Modes
The attached application diagrams show RS2WLAN operating in multiple industrial communication modes. These modes allow the device to be used either as an IoT gateway, a WiFi/LAN serial bridge, a Modbus TCP gateway or a Virtual COM device server.
| Mode |
Description |
Typical Use |
| IoT Gateway Mode |
Polls field device data and sends it via MQTT or HTTP POST over WiFi / LAN. |
IoTWatt 4.0, cloud dashboards, remote monitoring and multi-site data collection. |
| Pair Mode |
Creates a paired UDP / TCP wireless bridge between a server and client RS2WLAN. |
Replacing a cable between host PC and remote serial devices. |
| Bridge Mode |
Provides remote access through IP network / WiFi to local serial devices and PLCs. |
SCADA / BMS access to distributed equipment over LAN or WiFi. |
| Modbus TCP Master to Serial Slave |
Allows Modbus TCP masters to access serial Modbus RTU devices through RS2WLAN. |
Connecting PLC / SCADA Modbus TCP systems to RS485 meters and serial devices. |
| Modbus TCP Slave to Serial Master |
Allows serial masters to communicate with Modbus TCP slaves through RS2WLAN. |
Connecting HMI / serial master systems to TCP-based PLCs, inverters or meters. |
Typical Applications
SCADA and BMS Integration
Allow SCADA, BMS or EMS systems to access remote serial devices over WiFi or LAN.
Energy Monitoring
Connect Modbus power meters, energy meters and PQ meters to IoTWatt 4.0 or cloud dashboards.
Remote Meter Reading
Collect utility, power, water, gas or process meter data from distributed locations.
Industrial IoT Retrofit
Convert existing RS485 / RS232 devices into IP-connected assets without replacing field equipment.
Machine and PLC Data
Collect data from PLCs, drives, controllers, sensors, HMIs and relay outputs for monitoring and reporting.
Multi-Site Monitoring
Use RS2WLAN at multiple sites to transmit device data to MQTT brokers, IoTWatt and cloud systems.
Technical Specifications
| Category |
Specification |
| Product Type |
Industrial WiFi / LAN IoT gateway, serial device server and Modbus gateway |
| Serial Interface |
RS485 / RS422 terminal; RS232 DB9 |
| Ethernet |
10M / 100M Ethernet with 2kV surge protection |
| WiFi |
IEEE 802.11b/g |
| WiFi Security |
WEP, WPA and WPA2 |
| WiFi Modes |
STA Mode and AP Mode |
| Serial Baud Rate |
1200bps to 115200bps |
| Data Bits |
5 to 9 data bits |
| Parity |
None, Odd, Even, Mark, Space |
| Flow Control |
RTS / CTS, XON / XOFF, None |
| Network Protocols |
Ethernet, IP, TCP, UDP, HTTP, ARP, ICMP, DHCP and DNS |
| IoT Data Protocols |
MQTT and HTTP POST |
| Data Conversion |
DLT-645 and Modbus RTU parameters can be polled and converted to JSON format |
| Network Communication |
Direct TCP/IP and Virtual Serial Port |
| Communication Modes |
TCP Server, TCP Client, UDP and UDP Multicast |
| TCP Connections |
Supports 30 TCP clients in TCP Server mode and 7 destination IP addresses in TCP Client mode |
| Device Capacity |
Up to 256 slaves connected on RS485 / RS422 bus |
| Isolation / Protection |
1500V optical isolation on RS485 / RS422 data lines; 2kV surge protection on Ethernet port |
| Roaming |
Fast roaming for automatic switching between access points |
| Configuration |
3Wire Device Management Software and web browser configuration |
| Virtual Port |
3Wire ComPort Emulator software |
| Power Supply |
9–48VDC with dual voltage input, screw terminal or DC jack |
| Typical Current |
80mA at 12VDC; 40mA at 24VDC; 20mA at 48VDC |
| Wiring |
Plug-in screw terminal wiring; accepts AWG12 to AWG30 wires |
| LED Indicators |
Power, Link and Active LED indicators |
| Dimensions |
94mm (L) × 65mm (W) × 25mm (H) |
| Operating Temperature |
-40°C to +85°C |
| Storage Temperature |
-45°C to +125°C |
| Humidity |
5% to 95% RH |
Why RS2WLAN?
Many plants already have Modbus RTU meters, PLCs, drives and sensors installed, but the data is still locked inside serial networks. RS2WLAN provides a compact way to bring this data into SCADA, BMS, EMS and cloud applications over WiFi or LAN.
- Converts serial field device data into IP-accessible data.
- Supports MQTT and HTTP POST for cloud and IoT applications.
- Reduces the need for local PCs or complex gateway panels.
- Supports Modbus RTU-to-Modbus TCP conversion.
- Supports Virtual COM for legacy software that expects a serial port.
- Useful for retrofit energy monitoring and multi-site data collection.
- Industrial temperature range and electrical protection suit harsh environments.
Integration with IoTWatt 4.0
RS2WLAN is suitable for IoTWatt 4.0 deployments where site data can be collected through WiFi or LAN. It can connect power meters, energy meters, sensors and controllers to IoTWatt 4.0 for dashboards, analytics, alarms, reports and digital energy audit workflows.
- Connect Modbus RTU meters to IoTWatt 4.0 over WiFi / LAN.
- Collect feeder, plant, equipment or utility metering data.
- Send data to MQTT broker or HTTP endpoint for central processing.
- Support digital energy audit, EECA reporting and energy dashboard projects.
- Use with IoTWatt 4.0 alerts, tickets, dashboards and energy analytics.
Recommended Deployment Checklist
- Confirm field device interface: RS232, RS485, RS422 or Ethernet / TCP-IP.
- Confirm serial settings: baud rate, data bits, parity, stop bits and flow control.
- Confirm Modbus RTU register map, slave IDs and polling interval.
- Confirm WiFi mode: STA Mode, AP Mode or LAN-only operation.
- Confirm WiFi security settings: SSID, password, WEP / WPA / WPA2 and roaming requirement.
- Confirm MQTT broker or HTTP endpoint, topic structure and JSON payload requirement.
- Confirm TCP Server / TCP Client / UDP / Virtual COM mode required by SCADA or BMS software.
- Confirm power supply, panel space, antenna location and Ethernet surge protection requirement.
- Test connectivity, register values and data payload before final commissioning.
RS2WLAN Supply, Configuration and IoTWatt 4.0 Integration
Saturn Pyro supports 3Wire RS2WLAN gateways for WiFi / LAN IoT data collection, Modbus RTU-to-TCP conversion, SCADA / BMS integration, remote meter reading, energy monitoring, MQTT / HTTP data transmission and IoTWatt 4.0 projects in Malaysia.
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