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3Wire RS2WLAN | WiFi Serial Device Server & Modbus Gateway
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. 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. RS2WLAN supports cloud publishing, remote access and multiple operating modes for industrial data collection and system integration. Transmit collected device data to MQTT brokers, IoT cloud platforms and central dashboards. Supports HTTP-based data transmission for platform integration where MQTT is not used. DTL-645 and Modbus RTU parameters can be polled and converted into JSON format for easier IoT platform ingestion. Supports paired communication and bridge mode for remote serial access over WiFi / LAN networks. Enables Modbus TCP masters to access serial slave devices and supports serial masters accessing Modbus TCP devices. Supports TCP Server, TCP Client, UDP, UDP Multicast and virtual serial port operation. Connect Modbus RTU power meters, sensors and plant equipment to EMS, IoTWatt 4.0 or cloud analytics platforms. Allow BMS and SCADA systems to access serial and Ethernet devices remotely over WiFi or LAN. Connect PLCs, HMIs, inverters and automation equipment to IP-based systems and IoT applications. Poll meter data through Modbus RTU or DTL-645 and transmit the data to central monitoring systems. Use RS2WLAN across multiple sites to send field data to MQTT brokers, IoT cloud systems or dashboards. Convert device data into IoT-ready payloads for cloud monitoring, analytics, alerting and reporting. Links serial and Ethernet devices to IEEE 802.11b/g networks with access over Ethernet and WiFi. Operates in STA Mode to connect to a wireless router, or AP Mode for direct WiFi device connection. Supports secure wireless data access using WEP, WPA and WPA2. Supports fast roaming for quick automatic switching between access points. Provides 1500V optical isolation on RS485 / RS422 data lines and 2kV surge protection on the Ethernet port. Heartbeat and Keep Alive functions help maintain reliable WiFi / LAN communication. RS2WLAN is suitable for mixed field device networks involving serial devices, Ethernet devices and WiFi / LAN access. Use RS2WLAN when digital meters or sensors need to be connected to a central platform using WiFi or LAN. Use RS2WLAN when field data needs to be polled, converted and sent to MQTT brokers or IoT cloud platforms. Use RS2WLAN when SCADA, BMS or EMS systems need access to serial and Ethernet devices over IP networks. 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 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.Connect Serial and Ethernet Devices to IoT Platforms
WiFi / LAN gateway with MQTT, HTTP POST and Modbus gateway capability.
Why RS2WLAN?
IoT Gateway and Operating Modes
MQTT Publishing
HTTP POST / GET
JSON Data Format
Pair / Bridge Mode
Modbus TCP Gateway
TCP / UDP / Virtual COM
Typical Applications
Energy Management
BMS and SCADA
PLC and Automation
Automatic Meter Reading
Multi-Site Monitoring
IoT Data Collection
Key Features
WiFi and Ethernet Access
STA and AP Mode
Wireless Security
Fast Roaming
Industrial Isolation
Heartbeat and Keep Alive
Supported Device Connections
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
For Cloud Data Collection
For SCADA / BMS Remote Access
RS2WLAN Operation Diagram
Product Summary