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.
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.
Key Features
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.
Industrial Isolation
Provides 1500V optical isolation on RS485 / RS422 data lines and 2kV surge protection on Ethernet.
TCP / UDP Modes
Supports TCP Server, TCP Client, UDP and UDP Multicast communication modes.
Virtual COM Operation
Supports virtual serial port operation using 3Wire ComPort Emulator software for legacy software access.
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.
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
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.
