Description
3Wire Industrial WiFi / LAN IoT Gateway
RS2WLAN Serial Device Server & Modbus Gateway
3Wire RS2WLAN is an industrial 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 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.
WiFi 802.11b/g
10/100 Mbps Ethernet
RS232 / RS485 / RS422
MQTT / HTTP POST
Modbus RTU to TCP
STA / AP Mode
IoTWatt 4.0 Ready
Product Overview
RS2WLAN provides a practical bridge between field devices and modern IP-based systems. It is 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 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: RS2WLAN is an 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.
Why RS2WLAN Matters
Many plants already have useful data inside Modbus meters, PLCs, drives and sensors. RS2WLAN helps bring this data into LAN, WiFi, SCADA and cloud systems without replacing the field devices.
- WiFi / LAN retrofit
- Serial device bridge
- MQTT publishing
- HTTP data upload
- Modbus gateway
- Virtual COM support
- IoTWatt gateway
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
Meter, PLC, sensor, drive or controller.
2
RS485 / TCP-IP
Serial or Ethernet data source.
3
RS2WLAN Gateway
Polling, conversion and bridge functions.
4
WiFi / LAN
Local network or wireless access.
5
MQTT / IoTWatt
Cloud, broker, SCADA or dashboard.
Key Features at a Glance
WiFi / LAN IoT Gateway
Links serial and Ethernet devices to IEEE 802.11b/g WiFi and 10/100 Mbps Ethernet networks.
MQTT and HTTP POST
Supports data transmission to IoT platforms, brokers and cloud 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 field devices.
Modbus TCP Gateway
Converts Modbus RTU to Modbus TCP for PLC, SCADA, BMS, EMS and monitoring systems.
STA and AP Mode
Connects to a wireless router in STA mode or allows direct connection in AP mode.
Industrial Protection
Includes serial isolation and Ethernet surge protection for industrial environments.
Virtual COM Support
Supports Virtual Port operation using 3Wire ComPort Emulator software.
Wide Power Input
Supports 9 48 VDC with dual voltage input through screw terminal or DC jack.
Supported Operating Modes
| 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 server and client RS2WLAN units. |
Replacing a cable between a 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. |
| Virtual COM Mode |
Maps the remote serial port as a local COM port on a host PC. |
Legacy software that requires COM port communication. |
Technical Specifications Summary
| Category |
Specification |
| Product Type |
Industrial WiFi / LAN IoT gateway, serial device server and Modbus gateway. |
| Serial Interface |
RS485 / RS422 terminal and RS232 DB9. |
| Ethernet |
10M / 100M Ethernet with 2 kV surge protection. |
| WiFi |
IEEE 802.11b/g. |
| WiFi Security |
WEP, WPA and WPA2. |
| WiFi Modes |
STA Mode and AP Mode. |
| Serial Baud Rate |
1200 bps to 115200 bps. |
| Data Bits / Parity |
5 to 9 data bits; None, Odd, Even, Mark or Space parity. |
| Flow Control |
RTS / CTS, XON / XOFF or 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. |
| Communication Modes |
TCP Server, TCP Client, UDP and UDP Multicast. |
| TCP Connections |
Supports up to 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, depending on network design. |
| Isolation / Protection |
1500 V optical isolation on RS485 / RS422 data lines and 2 kV surge protection on Ethernet port. |
| Roaming |
Fast roaming for automatic switching between access points. |
| Configuration |
3Wire Device Management Software and web browser configuration. |
| Power Supply |
9 48 VDC with dual voltage input, screw terminal or DC jack. |
| Typical Current |
80 mA at 12 VDC; 40 mA at 24 VDC; 20 mA at 48 VDC. |
| Dimensions |
94 mm L x 65 mm W x 25 mm H. |
| Operating Temperature |
-40°C to +85°C. |
| Humidity |
5% to 95% RH. |
Applications and Best-Fit Sites
- SCADA integration
- BMS / EMS integration
- Energy monitoring
- Remote meter reading
- Industrial IoT retrofit
- Machine and PLC data
- WiFi meter networks
- Distributed panels
- Utility monitoring
- Cloud dashboards
- MQTT data upload
- IoTWatt 4.0 projects
Why RS2WLAN for Industrial IoT?
WiFi / LAN Retrofit
Converts serial field device data into IP-accessible data without replacing equipment.
Cloud Ready
Supports MQTT and HTTP POST for IoT platforms, cloud dashboards and remote monitoring systems.
SCADA and BMS Friendly
Supports Modbus RTU-to-Modbus TCP, Virtual COM and TCP / UDP communication modes.
Flexible Wireless Use
STA Mode connects to existing WiFi, while AP Mode allows direct local wireless access.
Industrial Hardware Design
Isolation, surge protection and wide temperature range support harsh panel environments.
IoTWatt Ready
Useful for energy monitoring, remote meter reading and digital energy audit data collection.
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.
- Modbus RTU meters
- WiFi / LAN data collection
- MQTT broker upload
- HTTP endpoint upload
- Energy dashboards
- Remote meter reading
- IoTWatt alerts
- DEES tickets
- Digital energy audit data
- EECA reporting support
Recommended Deployment Checklist
- Confirm RS232 / RS485 / RS422 / Ethernet
- Confirm baud rate
- Confirm data bits and parity
- Confirm stop bits
- Confirm flow control
- Confirm Modbus register map
- Confirm slave IDs
- Confirm polling interval
- Confirm STA / AP / LAN mode
- Confirm SSID and security
- Confirm MQTT / HTTP endpoint
- Confirm topic and JSON payload
- Confirm antenna location
- Test data before 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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More detail about Saturn Pyro Sdn Bhd
Malaysia
