Connect Serial Devices to Ethernet Networks
RS232 / RS485 / RS422 to TCP/IP, UDP/IP and Modbus TCP
3Wire RS2LAN is an advanced industrial-grade serial device server with integrated Modbus gateway functionality. It enables seamless conversion between Modbus RTU and Modbus TCP.
RS2LAN allows remote control and monitoring of RS232, RS485 and RS422 serial devices over TCP/IP or UDP/IP networks, making it suitable for PLCs, digital power meters, alarm sensors, PTZ camera control and other industrial serial devices.
It supports Modbus TCP Master, Modbus TCP Slave, Paired Mode and Bridge Mode, with flexible communication through direct IP or Virtual COM.
Why RS2LAN?
Many industrial sites still operate reliable RS232, RS485 or RS422 devices. The challenge is connecting these existing serial devices into modern Ethernet-based systems without replacing them.
RS2LAN bridges this gap by converting serial communication into Ethernet communication, allowing existing field devices to be accessed from SCADA, BMS, EMS, AMR systems, data loggers, remote PCs or IoT gateways.
Typical Applications
Industrial Automation
Connect PLCs, HMIs, relays and serial controllers to Ethernet-based industrial networks.
Automatic Meter Reading
Connect digital power meters and Modbus RTU devices to IP-based metering systems.
Energy Management
Integrate serial meters and sensors with EMS, BMS, SCADA or IoT gateways.
Surveillance Systems
Support serial-based PTZ camera control and alarm sensor integration over Ethernet.
Building Management
Bring legacy serial devices into IP-based BMS and facility monitoring networks.
IoT Gateway Integration
Connect serial field data to modern IoT platforms through Ethernet and Modbus TCP.
Flexible Operating Modes
RS2LAN supports multiple communication modes, allowing it to fit different site architectures and integration requirements.
TCP Server
Allows remote hosts or SCADA systems to connect to serial devices over TCP/IP. Supports up to 30 TCP clients in TCP Server mode.
TCP Client
RS2LAN can actively connect to remote servers and supports up to 7 destination IP addresses as TCP Client.
UDP / UDP Multicast
Supports UDP and UDP multicast communication for flexible industrial network data transmission.
Modbus TCP Server to Serial Device
Allows Modbus TCP masters to communicate with Modbus RTU serial devices connected through RS485, RS422 or RS232.
Modbus TCP Client to Serial Master
Supports communication between serial master devices and Modbus TCP devices such as PLCs, HMIs, inverters and DPMs.
Pair Bridge / Bridge Mode
Supports paired serial-to-Ethernet bridging and remote serial device connection across Ethernet or Internet networks.
Key Features
Industrial Isolation and Protection
1500V optical isolation on RS485 / RS422 data lines and 2kV surge protection on the Ethernet port.
Modbus TCP Gateway
Converts Modbus RTU to Modbus TCP for easy integration of serial Modbus devices into IP systems.
RS232 / RS485 / RS422 Support
Terminal block for RS485 and RS422, and DB9 connector for RS232 serial devices.
Up to 256 Serial Slaves
Supports up to 256 slave devices connected on the RS485 / RS422 bus where the serial network design allows.
Virtual COM Support
Virtual port operation is supported using 3Wire ComPort Emulator software.
Easy Configuration
Supports automatic discovery and configuration using 3Wire Device Management software or web browser configuration.
Heartbeat and Keep Alive
Heartbeat and Keep Alive functions help maintain reliable network connections.
Status Indicators
Power, Link and Active LED indicators provide quick status visibility during commissioning and operation.
External Factory Reset
Back-to-factory configuration can be triggered using the external reset switch.
Network Architecture Examples
The RS2LAN datasheet shows several deployment architectures, including Modbus TCP Server to Serial Device Mode, Modbus TCP Client to Serial Master Mode, Pair Bridge Mode and Bridge Mode.
Modbus TCP Server to Serial Device
Host PCs, PLCs or Modbus TCP masters can access RS232, RS485 and RS422 serial devices through the RS2LAN over Ethernet.
Modbus TCP Client to Serial Master
Serial masters such as HMIs can communicate with Modbus TCP devices such as PLCs, inverters and digital power meters.
Pair Bridge Mode
Two RS2LAN units can be paired to extend serial communication over Ethernet between a client-side and server-side network.
Bridge Mode
Remote hosts can access a local serial network through Ethernet or Internet connection, supporting remote monitoring and control.
Serial Device Access
Supports RS232 devices, RS485 Modbus RTU devices and RS422 devices connected to IP-based systems.
Industrial Gateway Use
Suitable as a practical gateway between field-level serial devices and plant-level IP networks.
Technical Highlights
| Parameter | RS2LAN Specification |
|---|---|
| Product Type | Industrial serial device server with Modbus gateway function |
| Serial Interfaces | RS232 / RS485 / RS422 |
| RS485 / RS422 Connection | Terminal block |
| RS232 Connection | DB9 connector |
| Ethernet | 10 / 100 Mbps Ethernet with 2kV surge protection |
| Modbus Gateway | Modbus RTU to Modbus TCP conversion |
| 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 Slaves | Supports 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 |
| Net Communication | Direct TCP/IP, Virtual Serial Port |
| Power Supply | 9VDC to 48VDC, 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 RS2LAN Fits
For Existing Serial Devices
Use RS2LAN when you need to connect RS232, RS485 or RS422 equipment to an Ethernet network without replacing the device.
For Modbus RTU Devices
Use RS2LAN as a Modbus TCP gateway to connect Modbus RTU meters, PLCs and sensors to IP-based systems.
For Remote Access
Use direct TCP/IP or Virtual COM to access serial equipment from a host computer or remote software system.
Product Summary
3Wire RS2LAN is an industrial-grade serial device server and Modbus gateway for connecting RS232, RS485 and RS422 devices to Ethernet networks.
With Modbus RTU to Modbus TCP conversion, optical isolation, Ethernet surge protection, flexible TCP / UDP modes, Virtual COM support and wide temperature operation, RS2LAN is suitable for industrial automation, AMR, energy management, BMS, SCADA and surveillance applications.
Contact 3Wire / Saturn Pyro for product selection, application support and integration guidance.
