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.
RS2WLAN supports Modbus TCP Master, Modbus TCP Slave / Paired Mode, Bridge Mode, direct IP access and Virtual COM operation, making it suitable for SCADA, BMS, EMS and IoT integration.
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.
The datasheet also illustrates multi-site IoT gateway architecture where RS2WLAN devices send data from multiple sites to MQTT brokers, IoTWatt and other cloud platforms through WiFi / LAN and the internet.
IoT Gateway with MQTT and HTTP POST
MQTT Publishing
RS2WLAN can be configured to transmit collected device data to MQTT brokers and IoT cloud platforms.
HTTP POST / GET
Supports HTTP-based data transmission for cloud and 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.
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 central dashboards.
IoT Data Collection
Convert device data into IoT-ready payloads for cloud monitoring, analytics, alerting and reporting.
Flexible Operating Modes
The datasheet shows RS2WLAN supporting Paired Mode, Bridge Mode, Modbus TCP Master to Serial Slave Mode and Modbus TCP Slave to Serial Master Mode.
Pair Mode
Supports paired communication between RS2WLAN units to extend serial communication over WiFi / LAN.
Bridge Mode
Allows remote and local hosts to access devices over IP networks using WiFi, LAN and serial interfaces.
Modbus TCP Master to Serial Slave
Enables Modbus TCP masters to access serial slave devices such as Modbus RTU meters and RS232 / RS422 devices.
Modbus TCP Slave to Serial Master
Allows serial master devices such as HMIs to communicate with Modbus TCP devices such as PLCs, inverters and DPMs.
TCP / UDP Modes
Supports TCP Server, TCP Client, UDP and UDP Multicast modes for different network architectures.
Virtual COM
Supports virtual serial port operation using 3Wire ComPort Emulator software.
Key Features
WiFi and Ethernet Access
Links serial and Ethernet devices to IEEE 802.11b/g networks with simultaneous access over Ethernet and WiFi.
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.
Wireless Security
Supports secure 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.
Up to 256 Serial Slaves
Supports up to 256 slaves connected on RS485 / RS422 bus, subject to network design and field conditions.
30 TCP Clients
Supports up to 30 TCP clients in TCP Server mode.
7 TCP Client Destinations
Supports up to 7 destination IP addresses in TCP Client mode.
Heartbeat and Keep Alive
Heartbeat and Keep Alive functions help ensure reliable 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.
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.
