Connect Serial Devices to Ethernet Networks
RS232 / RS485 / RS422 to TCP/IP, UDP/IP and Modbus TCP.
3Wire RS2LAN is an industrial-grade serial device server with integrated Modbus gateway functionality.
It enables RS232, RS485 and RS422 serial devices to be accessed over TCP/IP or UDP/IP networks, while supporting Modbus RTU to Modbus TCP conversion.
RS2LAN is suitable for PLCs, digital power meters, alarm sensors, PTZ camera control, automation equipment and other industrial serial devices.
Why RS2LAN?
Many industrial sites still depend on reliable serial devices. The challenge is connecting these existing RS232, RS485 or RS422 devices into modern Ethernet-based systems without replacing them.
RS2LAN bridges this gap by converting serial communication into Ethernet communication for SCADA, BMS, EMS, AMR systems, data loggers, remote PCs and 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.
Operating Modes and Key Capabilities
RS2LAN supports multiple communication modes, allowing it to fit different industrial network architectures and integration requirements.
TCP Server / TCP Client
Supports remote host access, up to 30 TCP clients in TCP Server mode, and up to 7 destination IP addresses in TCP Client mode.
UDP / UDP Multicast
Supports UDP and UDP multicast communication for flexible industrial network data transmission.
Modbus TCP Gateway
Allows Modbus TCP masters to communicate with Modbus RTU serial devices 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.
Virtual COM Operation
Virtual port operation is supported using 3Wire ComPort Emulator software for remote serial access.
Key Features
Industrial Isolation
1500V optical isolation on RS485 / RS422 data lines and 2kV surge protection on the Ethernet port.
Serial Interface Support
Supports RS232, RS485 and RS422 using terminal block and DB9 connection options.
Up to 256 Serial Slaves
Supports up to 256 slave devices connected on the RS485 / RS422 bus where the serial network design allows.
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.
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.
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 | -40C to 85C |
| Storage Temperature | -45C to 125C |
| Humidity | 5% to 95% RH |
| Dimensions | 94mm (L) 65mm (W) 25mm (H) |
RS2LAN Operation Diagram
The following visual supports the RS2LAN wired LAN architecture, serial device access, Modbus gateway modes, TCP / UDP communication and remote Ethernet connectivity information above.
RS2LAN Wired LAN Serial Device Server and Modbus Gateway Operation Diagram
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.
