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3Wire RS2LAN | Serial Device Server & Modbus Gateway

3Wire Industrial Serial Device Server & Modbus Gateway

RS2LAN Connect Existing Serial Devices to Ethernet and IoTWatt 4.0

3Wire RS2LAN is an industrial-grade serial device server and Modbus gateway for connecting RS232, RS485 and RS422 devices to Ethernet TCP/IP networks. It enables PLCs, digital power meters, sensors, alarm devices, PTZ controllers and other serial equipment to be accessed over LAN without replacing the installed devices.

For IoTWatt 4.0 projects, RS2LAN helps bring existing Modbus RTU power meters and serial devices into an Ethernet-ready data collection layer. This supports energy dashboards, digital energy audit evidence, EECA reporting, load profiling and long-term energy intelligence.

RS232 / RS485 / RS422 10 / 100 Mbps Ethernet Modbus RTU to TCP TCP Server / Client UDP / Multicast Virtual COM IoTWatt 4.0 Ready

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Product Type Industrial serial-to-Ethernet device server and Modbus gateway

Serial Interface RS232, RS485 and RS422 field-device connectivity

Gateway Function Modbus RTU to Modbus TCP conversion for IP-based systems

IoTWatt Value Connects existing meters to IoTWatt 4.0 without major panel redesign

Overview: Keep the Serial Devices, Add Ethernet Access

Many industrial and building systems 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 or disturbing working installations.

RS2LAN bridges this gap by converting serial communication into Ethernet communication for SCADA, BMS, EMS, AMR systems, data loggers, remote PCs and IoT gateways. It also provides Modbus RTU to Modbus TCP conversion, making existing Modbus serial devices easier to connect into modern supervisory and cloud platforms.

Key positioning

RS2LAN is best positioned as an industrial serial-to-Ethernet gateway for retrofit projects where existing RS485 / RS232 / RS422 devices must support SCADA, BMS, EMS, AMR and IoTWatt 4.0 monitoring workflows.

How RS2LAN Supports IoTWatt 4.0 Connectivity

IoTWatt 4.0 depends on reliable field data. RS2LAN helps connect installed serial meters and devices into an Ethernet-ready gateway layer so that the same field data can support dashboards, analytics, reports and energy audit workflows.

1. Field Devices Power meters, PLCs, controllers, sensors or RTUs.

2. Serial Link RS232, RS485 or RS422 communication.

3. RS2LAN Serial-to-Ethernet and Modbus gateway layer.

4. Ethernet TCP/IP, UDP/IP, Modbus TCP or Virtual COM.

5. IoTWatt 4.0 Dashboards, tickets, reports, EECA and audit analytics.

Key Features

LAN

Serial to Ethernet Access

Connect RS232, RS485 and RS422 serial devices to TCP/IP networks for remote access and integration.

Modbus TCP Gateway

Converts Modbus RTU to Modbus TCP for easier integration with Ethernet-based SCADA, EMS and monitoring systems.

ISO

Industrial Isolation

Provides 1500V optical isolation on RS485 / RS422 data lines and 2kV surge protection on Ethernet.

TCP

TCP / UDP Modes

Supports TCP Server, TCP Client, UDP and UDP Multicast communication modes.

COM

Virtual COM Operation

Supports virtual serial port operation using 3Wire ComPort Emulator software for legacy software access.

256

Large Serial Bus Support

Supports up to 256 slave devices connected on the RS485 / RS422 bus, depending on site network design.

Multiple TCP Clients

Supports up to 30 TCP clients in TCP Server mode and up to 7 destination IP addresses in TCP Client mode.

Easy Configuration

Supports automatic discovery, 3Wire Device Management software and web browser configuration.

PWR

Wide Power Input

Supports 9VDC to 48VDC dual voltage input through screw terminal or DC jack.

Operating Modes

Mode	Function	Typical Use
TCP Server	Allows multiple TCP clients to access the serial device server.	Remote SCADA, EMS, BMS or engineering workstation access.
TCP Client	Connects to configured destination IP addresses.	Serial data forwarding to host systems or central monitoring servers.
UDP / UDP Multicast	Supports UDP and multicast communication.	Lightweight communication or broadcast-type serial data transport.
Modbus TCP Gateway	Converts Modbus RTU to Modbus TCP.	Connect RS485 Modbus meters, sensors and controllers to Ethernet-based platforms.
Paired / Bridge Mode	Supports remote serial bridging across Ethernet or IP networks.	Serial device extension where direct serial cabling is not practical.
Virtual COM	Creates a virtual serial port over IP.	Allows legacy software to communicate with remote serial devices as if locally connected.

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 and 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 and Space
Flow Control	RTS / CTS, XON / XOFF or None
Net Communication	Direct TCP/IP and 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) x 65mm (W) x 25mm (H)

Typical Applications

IoTWatt 4.0 Meter Integration

Connect Modbus RTU power meters and serial devices to IoTWatt 4.0 through Ethernet-ready communication.

Energy Management Systems

Integrate serial meters, data loggers and Modbus devices with EMS, BMS, SCADA or IP-based monitoring systems.

Industrial Automation

Connect PLCs, HMIs, relays, controllers and serial automation equipment to Ethernet networks.

Automatic Meter Reading

Enable remote access and data collection from serial energy, water, gas or utility meters.

Building Management

Bring legacy serial devices into IP-based BMS and facility monitoring networks.

Remote Serial Access

Use direct TCP/IP or Virtual COM to access remote serial devices from host systems or engineering tools.

Integration with IoTWatt 4.0

RS2LAN is useful in IoTWatt 4.0 Digital Energy Audit and Energy Intelligence projects where existing meters and controllers are already available over RS485 / RS232 / RS422. Instead of replacing the installed field devices, RS2LAN can expose them through Ethernet and Modbus TCP for easier data acquisition.

IoTWatt 4.0 Use	How RS2LAN Supports It
Energy Dashboard	Connects Modbus RTU meters to Ethernet-based monitoring and gateway systems.
Digital Energy Audit	Provides access to meter data for load profiling, audit evidence and energy analytics.
EECA Reporting	Supports reliable meter data collection for regulatory reporting workflows.
Retrofit Projects	Allows existing serial meters and devices to be reused without major rewiring or device replacement.
SCADA / EMS Coexistence	Supports local supervisory systems and IoTWatt 4.0 integration through a practical gateway layer.

IoTWatt 4.0 call to action

Use RS2LAN when existing serial meters are available at site and the objective is to bring them into IoTWatt 4.0 quickly for dashboards, digital energy audit reports, EECA reporting and savings visibility.

Recommended Deployment Checklist

Confirm the field device interface: RS232, RS485 or RS422.
Confirm the protocol type: Modbus RTU, transparent serial or vendor-specific serial protocol.
Confirm baud rate, parity, data bits, stop bits and flow control.
Confirm Ethernet network availability, IP addressing and firewall requirements.
Confirm operating mode: TCP Server, TCP Client, UDP, Modbus Gateway, Paired Mode or Virtual COM.
Confirm Modbus slave addresses and avoid duplicate addressing.
Confirm RS485 bus wiring, termination, biasing and cable shielding.
Test end-to-end communication before handover to IoTWatt 4.0 or the host system.

Related Keywords

3Wire RS2LAN Serial to Ethernet Gateway RS485 to Ethernet RS232 to Ethernet RS422 Gateway Modbus RTU to TCP Industrial Serial Device Server Virtual COM Gateway IoTWatt 4.0 Ready Digital Energy Audit Connectivity Energy Meter Gateway SCADA EMS Integration

RS2LAN Operation Diagram

The diagram below shows the RS2LAN wired LAN serial device server and Modbus gateway operation concept.

RS2LAN wired LAN serial device server and Modbus gateway operation diagram

RS2LAN Supply, Setup and IoTWatt 4.0 Integration

Saturn Pyro supports 3Wire RS2LAN gateways for RS485 / RS232 / RS422 serial device integration, Modbus RTU to TCP conversion, BMS / EMS / SCADA connectivity, IoTWatt 4.0 digital energy audit projects, EECA reporting data collection and industrial Ethernet retrofit monitoring in Malaysia.

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