Description
3Wire Industrial Ethernet Serial Device Server
RS2LAN Serial Device Server & Modbus Gateway
3Wire RS2LAN is an advanced industrial-grade serial device server with integrated Modbus gateway functionality. It enables RS232, RS485 and RS422 serial devices to be accessed, controlled and monitored over TCP/IP or UDP/IP Ethernet networks.
RS2LAN is suitable for connecting PLCs, digital power meters, alarm sensors, PTZ camera controllers, Modbus RTU devices and other serial equipment to IP-based systems such as SCADA, BMS, EMS, AMR, energy monitoring platforms and IoTWatt 4.0.
Network 10/100Mbps Ethernet
Serial Interface RS232 / RS485 / RS422
Gateway Function Modbus RTU to Modbus TCP conversion
Industrial Protection 1500V serial isolation and 2kV Ethernet surge protection
Product Overview
Many industrial devices still communicate through serial ports, while modern control and monitoring systems rely on Ethernet and TCP/IP networks. RS2LAN bridges this gap by converting serial communications into network-accessible data.
The unit can operate in Modbus TCP Master, Modbus TCP Slave, Paired Mode and Bridge Mode. It supports direct IP access and Virtual COM operation, making it suitable for both new Ethernet-based systems and legacy software that still expects a local serial port.
Positioning: Industrial Ethernet serial device server and Modbus gateway for connecting RS232 / RS485 / RS422 devices to SCADA, BMS, EMS, AMR and IoT systems.
Typical Communication Flow
RS2LAN connects serial field devices to an Ethernet network, allowing host PCs, PLCs, SCADA, BMS or IoTWatt systems to access remote devices through TCP/IP, UDP/IP, Modbus TCP or Virtual COM.
1 Field Device
2 RS232 / RS485 / RS422
3 RS2LAN Gateway
4 Ethernet / TCP-IP
5 SCADA / BMS / IoTWatt
Key Features
Serial-to-Ethernet Access
Allows RS232, RS485 and RS422 devices to be accessed over Ethernet using TCP/IP or UDP/IP.
Modbus TCP Gateway
Converts Modbus RTU to Modbus TCP for integration with PLC, SCADA, BMS, EMS and monitoring systems.
Industrial Communication Protection
Includes 1500V optical isolation on RS485 / RS422 data lines and 2kV surge protection on Ethernet port.
Multi-Mode Operation
Supports TCP Server, TCP Client, UDP and UDP Multicast communication modes.
Virtual COM Support
Supports Virtual Port operation using 3Wire ComPort Emulator software for legacy serial software.
Large RS485 Network
Supports up to 256 slave devices on RS485 / RS422 bus, depending on network design and device loading.
Multiple TCP Clients
Supports up to 30 TCP clients in TCP Server mode and up to 7 destination IP addresses in TCP Client mode.
Reliable Connection
Heartbeat and keep-alive function help maintain stable network communication.
Easy Configuration
Automatic discovery and configuration using 3Wire Device Management Software or web browser.
Supported Operating Modes
The attached application diagram shows RS2LAN operating as a Modbus TCP server to serial device gateway, Modbus TCP client to serial master gateway, pair bridge and bridge mode. This allows the same hardware to be used for multiple industrial integration requirements.
| Mode |
Description |
Typical Use |
| Modbus TCP Server to Serial Device Mode |
Allows Modbus TCP masters to access serial Modbus RTU devices through RS2LAN. |
PLC, SCADA or host PCs reading RS485 meters, RS232 devices and RS422 devices. |
| Modbus TCP Client to Serial Master Mode |
Allows serial masters to communicate with Modbus TCP slaves through RS2LAN. |
HMI master accessing Modbus TCP PLCs, inverters or digital power meters. |
| Pair Bridge Mode |
Creates a client / server bridge between two RS2LAN units over Ethernet or Internet. |
Replacing a long serial cable between a host PC and remote serial devices. |
| Bridge Mode |
Provides remote host access to local serial devices through an IP network. |
Remote SCADA, BMS or maintenance PC accessing site equipment. |
| Virtual COM Mode |
Maps the remote serial port as a virtual local COM port on a host PC. |
Legacy software that only supports COM port communication. |
Typical Applications
Industrial Automation
Connect PLCs, HMIs, drives, sensors, relays and controllers to IP-based automation systems.
Automatic Meter Reading
Read digital power meters, energy meters and utility meters through Ethernet networks.
Energy Management
Integrate Modbus RTU meters into EMS, BMS, SCADA and IoTWatt 4.0 monitoring systems.
Surveillance Systems
Connect PTZ camera control and serial alarm devices to IP networks.
Building Management
Bridge legacy serial controllers, meters and field devices into BMS networks.
Serial Retrofit Projects
Upgrade existing RS485 / RS232 systems for network access without replacing field equipment.
Technical Specifications
| Category |
Specification |
| Product Type |
Industrial serial device server and Modbus gateway |
| Serial Interface |
RS485 / RS422 terminal; RS232 DB9 |
| Ethernet |
10M / 100M Ethernet with 2kV surge protection |
| Serial Signal |
RS232 / RS485 / RS422 × 1: RXD, TXD, GND, CTS, RTS |
| Serial Baud Rate |
1200bps to 115200bps |
| Data Bits |
5 to 9 data bits |
| Parity |
None, Odd, Even, Mark, Space |
| Flow Control |
RTS / CTS, XON / XOFF, None |
| Network Protocols |
Ethernet, IP, TCP, UDP, HTTP, ARP, ICMP, DHCP and DNS |
| Network Communication |
Direct TCP/IP and Virtual Serial Port |
| Communication Modes |
TCP Server, TCP Client, UDP and UDP Multicast |
| Modbus Function |
Modbus TCP gateway function, converting Modbus RTU to Modbus TCP |
| TCP Connections |
Supports 30 TCP clients in TCP Server mode and 7 destination IP addresses in TCP Client mode |
| Device Capacity |
Up to 256 slaves connected on RS485 / RS422 bus |
| Isolation / Protection |
1500V optical isolation on RS485 / RS422 data lines; 2kV surge protection on Ethernet port |
| LED Indicators |
Power, Link and Active LED indicators |
| Configuration |
3Wire Device Management Software and web browser configuration |
| Factory Reset |
Back to factory configuration by external switch |
| Power Supply |
9–48VDC with dual voltage input, screw terminal or DC jack |
| Typical Current |
80mA at 12VDC; 40mA at 24VDC; 20mA at 48VDC |
| Power Connector |
5.5mm plug and 2-way pluggable terminal block |
| Wiring |
Plug-in screw terminal wiring; accepts AWG12 to AWG30 wires |
| Dimensions |
94mm (L) × 65mm (W) × 25mm (H) |
| Operating Temperature |
-40°C to +85°C |
| Storage Temperature |
-45°C to +125°C |
| Humidity |
5% to 95% RH |
Why RS2LAN?
RS2LAN is useful when existing industrial devices already have RS232, RS485 or RS422 communication, but the control or monitoring system is Ethernet-based. It reduces the need to replace field devices and provides a practical migration path from serial communication to IP-based integration.
- Converts serial field device communication into Ethernet-accessible data.
- Supports Modbus RTU-to-Modbus TCP conversion for modern PLC, SCADA and BMS systems.
- Allows remote access to serial devices through direct TCP/IP or Virtual COM.
- Supports legacy software through 3Wire ComPort Emulator.
- Useful for energy meters, PLCs, drives, relays, sensors and camera control systems.
- Industrial isolation, surge protection and temperature range support factory environments.
- Suitable for retrofit energy monitoring and IoTWatt 4.0 data collection projects.
Integration with IoTWatt 4.0 and Monitoring Systems
RS2LAN can be used in IoTWatt 4.0 projects where RS485 Modbus meters or other serial devices are connected to an Ethernet network. It enables data collection from power meters, energy meters, sensors and controllers for dashboards, alarms, reports and digital energy audit workflows.
- Connect Modbus RTU meters to IoTWatt 4.0 through Ethernet.
- Bridge field devices into SCADA, BMS, EMS and cloud monitoring systems.
- Support energy dashboards, equipment monitoring and remote meter reading.
- Use Modbus TCP gateway mode for easier integration into Ethernet-based systems.
- Support digital energy audit, EECA reporting and IoTWatt 4.0 analytics.
Recommended Deployment Checklist
- Confirm field device interface: RS232, RS485 or RS422.
- Confirm serial settings: baud rate, data bits, parity, stop bits and flow control.
- Confirm Modbus RTU slave IDs and register maps if used with meters or PLCs.
- Confirm operating mode: TCP Server, TCP Client, UDP, UDP Multicast, Bridge Mode or Virtual COM.
- Confirm whether the host system requires Modbus TCP Master or Modbus TCP Slave operation.
- Confirm IP address, subnet, gateway, port numbers and firewall rules.
- Confirm 9–48VDC power supply, grounding and surge protection requirement.
- Confirm RS485 cable routing, termination, biasing and shielding requirements.
- Test register values and communication stability before final commissioning.
RS2LAN Supply, Configuration and IoTWatt 4.0 Integration
Saturn Pyro supports 3Wire RS2LAN gateways for serial-to-Ethernet conversion, Modbus RTU-to-Modbus TCP integration, SCADA / BMS / EMS connectivity, AMR, remote meter reading, industrial automation, energy monitoring and IoTWatt 4.0 projects in Malaysia.
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