Connect Serial and Ethernet Devices to IoT Platforms
WiFi / LAN gateway with MQTT, HTTP POST and Modbus gateway capability.
3Wire RS2WLAN is an industrial-grade WiFi / LAN IoT gateway designed to connect serial and Ethernet-based devices such as PLCs, meters and sensors to cloud-based IoT platforms.
It enables SCADA and BMS software to remotely access field devices over WiFi or LAN, while also allowing active polling of device data and transmission to IoT platforms through MQTT or HTTP POST.
Why RS2WLAN?
Many sites need to collect data from serial devices such as Modbus RTU meters, PLCs and sensors, but wired Ethernet access may not always be practical.
RS2WLAN bridges this gap by supporting both Ethernet and WiFi access, allowing field data to be connected to SCADA, BMS, EMS, cloud platforms or IoT applications.
IoT Gateway and Operating Modes
RS2WLAN supports cloud publishing, remote access and multiple operating modes for industrial data collection and system integration.
MQTT Publishing
Transmit collected device data to MQTT brokers, IoT cloud platforms and central dashboards.
HTTP POST / GET
Supports HTTP-based data transmission for platform integration where MQTT is not used.
JSON Data Format
DTL-645 and Modbus RTU parameters can be polled and converted into JSON format for easier IoT platform ingestion.
Pair / Bridge Mode
Supports paired communication and bridge mode for remote serial access over WiFi / LAN networks.
Modbus TCP Gateway
Enables Modbus TCP masters to access serial slave devices and supports serial masters accessing Modbus TCP devices.
TCP / UDP / Virtual COM
Supports TCP Server, TCP Client, UDP, UDP Multicast and virtual serial port operation.
Typical Applications
Energy Management
Connect Modbus RTU power meters, sensors and plant equipment to EMS, IoTWatt 4.0 or cloud analytics platforms.
BMS and SCADA
Allow BMS and SCADA systems to access serial and Ethernet devices remotely over WiFi or LAN.
PLC and Automation
Connect PLCs, HMIs, inverters and automation equipment to IP-based systems and IoT applications.
Automatic Meter Reading
Poll meter data through Modbus RTU or DTL-645 and transmit the data to central monitoring systems.
Multi-Site Monitoring
Use RS2WLAN across multiple sites to send field data to MQTT brokers, IoT cloud systems or dashboards.
IoT Data Collection
Convert device data into IoT-ready payloads for cloud monitoring, analytics, alerting and reporting.
Key Features
WiFi and Ethernet Access
Links serial and Ethernet devices to IEEE 802.11b/g networks with access over Ethernet and WiFi.
STA and AP Mode
Operates in STA Mode to connect to a wireless router, or AP Mode for direct WiFi device connection.
Wireless Security
Supports secure wireless data access using WEP, WPA and WPA2.
Fast Roaming
Supports fast roaming for quick automatic switching between access points.
Industrial Isolation
Provides 1500V optical isolation on RS485 / RS422 data lines and 2kV surge protection on the Ethernet port.
Heartbeat and Keep Alive
Heartbeat and Keep Alive functions help maintain reliable WiFi / LAN communication.
Supported Device Connections
RS2WLAN is suitable for mixed field device networks involving serial devices, Ethernet devices and WiFi / LAN access.
- RS232 devices
- RS485 Modbus RTU devices
- RS422 devices
- Digital power meters
- PLCs and HMIs
- Sensors and relay outputs
- Inverters with Modbus TCP
- Modbus TCP DPM / slave devices
- SCADA, BMS and EMS hosts
Technical Highlights
| Parameter | RS2WLAN Specification |
|---|---|
| Product Type | Industrial WiFi / LAN IoT gateway and serial device server |
| Serial Interface | RS232 / RS485 / RS422 × 1; RXD, TXD, GND, CTS, RTS |
| RS485 / RS422 Connection | Terminal block |
| RS232 Connection | DB9 connector |
| Ethernet | 10 / 100 Mbps Ethernet with 2kV surge protection |
| WiFi | IEEE 802.11b/g |
| Wireless Modes | STA Mode and AP Mode |
| Wireless Security | WEP, WPA, WPA2 |
| IoT Protocols | MQTT and HTTP POST / GET |
| Polled Data Conversion | DTL-645 and Modbus RTU parameters can be converted to JSON format |
| Network Protocols | Ethernet, IP, TCP, UDP, HTTP, ARP, ICMP, DHCP, DNS |
| Operating Modes | TCP Server, TCP Client, UDP, UDP Multicast, Modbus TCP Master, Modbus TCP Slave, Paired Mode, Bridge Mode |
| TCP Server Capacity | Supports up to 30 TCP clients |
| TCP Client Destinations | Supports up to 7 destination IP addresses |
| Serial Slave Capacity | Up to 256 slaves on RS485 / RS422 bus |
| Baud Rate | 1200 bps to 115200 bps |
| Data Bits | 5 bits to 9 bits |
| Parity | None, Odd, Even, Mark, Space |
| Flow Control | RTS / CTS, XON / XOFF, None |
| Configuration | 3Wire Device Management Software and web browser configuration |
| Net Communication | Direct TCP/IP and Virtual Serial Port |
| Power Supply | 9–48V DC with dual voltage input via screw terminal or DC jack |
| Power Consumption | 80mA @ 12V, 40mA @ 24V, 20mA @ 48V |
| 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 RS2WLAN Fits
For Wireless Metering
Use RS2WLAN when digital meters or sensors need to be connected to a central platform using WiFi or LAN.
For Cloud Data Collection
Use RS2WLAN when field data needs to be polled, converted and sent to MQTT brokers or IoT cloud platforms.
For SCADA / BMS Remote Access
Use RS2WLAN when SCADA, BMS or EMS systems need access to serial and Ethernet devices over IP networks.
RS2WLAN Operation Diagram
The following visual supports the RS2WLAN WiFi / LAN IoT gateway, MQTT data flow, Modbus gateway and multi-site cloud connectivity information above.
RS2WLAN WiFi / LAN IoT Gateway Operation Diagram
Product Summary
3Wire RS2WLAN is an industrial WiFi / LAN IoT gateway and serial device server that connects RS232, RS485, RS422 and Ethernet devices to cloud platforms, SCADA, BMS, EMS and IoT systems.
With MQTT, HTTP POST / GET, Modbus RTU to JSON conversion, Modbus TCP gateway modes, Virtual COM, WiFi STA/AP operation, fast roaming, wireless security and industrial isolation, RS2WLAN is suitable for modern industrial and energy monitoring applications.
Contact 3Wire / Saturn Pyro for product selection, application support and IoT gateway integration guidance.
