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3Wire RS2WLAN | WiFi Serial Device Server & Modbus Gateway

3Wire Industrial WiFi / LAN IoT Gateway

RS2WLAN Connect Serial and Ethernet Devices to IoTWatt 4.0

3Wire RS2WLAN is an industrial-grade WiFi / LAN IoT gateway designed to connect serial and Ethernet-based devices such as PLCs, power meters, sensors, controllers and field instruments to cloud-based IoT platforms.

For IoTWatt 4.0 projects, RS2WLAN helps bring existing Modbus RTU meters, DTL-645 meters and Ethernet devices into a practical WiFi / LAN data collection layer. It supports MQTT, HTTP POST / GET, JSON data conversion and Modbus gateway functions for energy dashboards, digital energy audit evidence, EECA reporting and energy intelligence workflows.

WiFi / LAN Gateway RS232 / RS485 / RS422 MQTT HTTP POST / GET Modbus Gateway JSON Data Publishing IoTWatt 4.0 Ready

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Product Type Industrial WiFi / LAN IoT gateway and serial device server

Connectivity Serial, Ethernet, WiFi, MQTT and HTTP-based data publishing

Gateway Function Modbus gateway and JSON conversion for IoT platform ingestion

IoTWatt Value Connects field meters to IoTWatt 4.0 without heavy cabling changes

Overview: WiFi / LAN Access for Industrial Field Data

Many sites need to collect data from serial devices such as Modbus RTU meters, PLCs, sensors and controllers, but wired Ethernet access may not always be practical. RS2WLAN bridges this gap by supporting both Ethernet and WiFi access for field data collection and remote device access.

The gateway can actively poll selected device data, convert DTL-645 and Modbus RTU parameters into JSON format, and transmit the data to IoT platforms using MQTT or HTTP POST / GET. It can also support SCADA, BMS and EMS remote access through TCP / UDP, Modbus gateway and Virtual COM functions.

Key positioning

RS2WLAN is best positioned as an industrial WiFi / LAN gateway for energy monitoring, automation, SCADA / BMS access, MQTT data publishing and IoTWatt 4.0 retrofit data collection projects.

How RS2WLAN Supports IoTWatt 4.0 Connectivity

IoTWatt 4.0 depends on reliable and frequent meter data. RS2WLAN helps connect existing field devices to the IoTWatt 4.0 platform through WiFi / LAN where wired Ethernet or cellular gateways are not the best option.

1. Field Devices Power meters, PLCs, sensors, controllers or DTL-645 meters.

2. RS2WLAN Polls serial / Ethernet devices and prepares data.

3. WiFi / LAN Connects through STA mode, AP mode or Ethernet LAN.

4. IoTWatt 4.0 Dashboards, tickets, analytics, reports and audit evidence.

5. Action Energy savings, EECA reports and operational visibility.

Key Features

WiFi

WiFi and Ethernet Access

Links serial and Ethernet devices to IEEE 802.11b/g WiFi networks with simultaneous access over Ethernet and WiFi.

MQTT

MQTT and HTTP Publishing

Publishes selected device data to IoT platforms using MQTT or HTTP POST / GET.

JSON

Data Conversion to JSON

Polls DTL-645 and Modbus RTU parameters and converts selected values into JSON format.

STA and AP Mode

Operates in STA mode to connect to a wireless router or AP mode for direct WiFi device connection.

SEC

Wireless Security

Supports WEP, WPA and WPA2 security for protected wireless data access.

Fast Roaming

Supports fast roaming for quick automatic switching between access points.

ISO

Industrial Isolation

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

COM

Virtual COM Operation

Supports direct TCP/IP and Virtual Serial Port operation for remote serial access.

Heartbeat and Keep Alive

Heartbeat and Keep Alive functions help maintain reliable WiFi / LAN communication.

Operating Modes

Mode / Function	Purpose	Typical Use
MQTT Publishing	Sends selected device data to MQTT brokers and IoT platforms.	IoTWatt 4.0, cloud dashboards, EMS platforms and data hubs.
HTTP POST / GET	Supports HTTP-based data transmission to platform endpoints.	IoT platform integration where MQTT is not preferred.
Modbus TCP Gateway	Allows Modbus TCP systems to access Modbus RTU serial devices.	SCADA, EMS, BMS and Ethernet-based Modbus systems.
TCP Server / TCP Client	Supports serial data access through TCP/IP communication.	Remote serial access, host polling and gateway communication.
UDP / UDP Multicast	Supports UDP communication and multicast use cases.	Lightweight or broadcast-type network communication.
Bridge / Paired Mode	Supports serial extension across WiFi / LAN networks.	Remote access where direct serial cabling is not practical.
Virtual COM	Creates a virtual serial port over IP.	Legacy software access to remote serial devices.

Technical Highlights

Parameter	RS2WLAN Specification
Product Type	Industrial WiFi / LAN IoT gateway and serial device server
Serial Interface	RS232 / RS485 / RS422 x 1; RXD, TXD, GND, CTS and RTS
RS485 / RS422 Connection	Terminal block
RS232 Connection	DB9 connector
Ethernet	10 / 100 Mbps Ethernet with 2kV surge protection
WiFi	IEEE 802.11b/g
Wireless Modes	STA mode and AP mode
Wireless Security	WEP, WPA and WPA2
IoT Protocols	MQTT and HTTP POST / GET
Data Conversion	DTL-645 and Modbus RTU parameters can be polled and converted to JSON format
Network Protocols	Ethernet, IP, TCP, UDP, HTTP, ARP, ICMP, DHCP and DNS
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 Slave Capacity	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
Configuration	3Wire Device Management software and web browser configuration
Net Communication	Direct TCP/IP and Virtual Serial Port
Power Supply	9-48V DC with 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 meters and field devices to IoTWatt 4.0 using WiFi / LAN connectivity.

Energy Management Systems

Send meter and equipment data to EMS, dashboards, cloud platforms and monitoring systems.

BMS and SCADA Access

Allow BMS and SCADA systems to access serial and Ethernet devices remotely over WiFi or LAN.

Automatic Meter Reading

Poll meter data through Modbus RTU or DTL-645 and transmit the data to central systems.

Industrial IoT Projects

Convert device data into IoT-ready JSON payloads for cloud monitoring, analytics and reporting.

Retrofit Monitoring

Useful where wired Ethernet is difficult but WiFi coverage is available near the electrical panel or equipment.

Integration with IoTWatt 4.0

RS2WLAN is useful in IoTWatt 4.0 Digital Energy Audit and Energy Intelligence projects where existing meters or controllers are available over RS485 / RS232 / RS422, and WiFi / LAN is the preferred path for data connectivity. It helps reduce the need for heavy network cabling while still enabling structured meter data collection.

IoTWatt 4.0 Use	How RS2WLAN Supports It
Energy Dashboard	Polls Modbus RTU meters and publishes data through WiFi / LAN using MQTT or HTTP.
Digital Energy Audit	Provides access to load profile and equipment data for audit evidence and analytics.
EECA Reporting	Supports reliable meter data collection for regulatory reporting workflows.
Retrofit Projects	Allows existing serial meters and devices to be reused where wired LAN installation is not practical.
SCADA / BMS Coexistence	Supports local systems and IoTWatt 4.0 integration through a practical WiFi / LAN gateway layer.

IoTWatt 4.0 call to action

Use RS2WLAN when existing meters are already available at site and WiFi / LAN is the fastest way to bring their data into IoTWatt 4.0 for dashboards, digital energy audit reports, EECA reporting and savings visibility.

Recommended Deployment Checklist

Confirm field device interface: RS232, RS485, RS422 or Ethernet.
Confirm the protocol type: Modbus RTU, DTL-645, Modbus TCP or transparent serial.
Confirm baud rate, parity, data bits, stop bits and flow control.
Confirm WiFi coverage, SSID, security method and signal quality at the panel location.
Confirm whether STA mode, AP mode or Ethernet LAN access will be used.
Confirm MQTT broker, HTTP endpoint, payload format and polling interval.
Confirm RS485 wiring, termination, biasing, grounding and cable shielding.
Test end-to-end communication before handover to IoTWatt 4.0 or the host platform.

Related Keywords

3Wire RS2WLAN WiFi IoT Gateway LAN IoT Gateway RS485 WiFi Gateway Modbus RTU to MQTT Modbus RTU to JSON Industrial WiFi Gateway MQTT Gateway IoTWatt 4.0 Ready Digital Energy Audit Connectivity Energy Meter WiFi Gateway SCADA BMS EMS Integration

RS2WLAN Operation Diagram

The diagram below shows the RS2WLAN WiFi / LAN IoT gateway operation concept, including serial device access, MQTT / HTTP publishing, Modbus gateway use and cloud connectivity.

RS2WLAN WiFi / LAN IoT gateway operation diagram

RS2WLAN Supply, Setup and IoTWatt 4.0 Integration

Saturn Pyro supports 3Wire RS2WLAN gateways for WiFi / LAN data communication, RS485 / RS232 / RS422 integration, MQTT / HTTP publishing, Modbus gateway applications, BMS / EMS / SCADA connectivity, IoTWatt 4.0 digital energy audit projects and EECA reporting data collection in Malaysia.

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