The HW group IP Relay HWg‑ER02b is a versatile industrial converter that connects serial communication interfaces (RS‑232/485) and digital I/O with Ethernet networks. With its rugged construction, DIN‑rail mounting, and two high‑power 230 V / 16 A relay outputs, it is the perfect solution for industrial automation, building management systems, and remote control of critical processes.

From integrating barcode scanners to controlling access systems or monitoring UPS devices, the IP Relay HWg‑ER02b delivers precise, reliable, real‑time control for LAN‑based infrastructures.

Functionality and Applications

The IP Relay HWg‑ER02b combines a full RS‑232/485 port with two digital inputs and two relay outputs. The serial port can be integrated into Windows using the free HW VSP3 software, which supports up to 100 virtual COM ports per PC — allowing seamless remote device control over the network.

The digital inputs and outputs can be controlled via the web interface, Modbus/TCP, or HTTP/Telnet commands, making the device ideal for SCADA systems or custom automation applications.

Box‑to‑Box Mode:

By connecting two IP Relay HWg‑ER02b units over LAN, both serial data and digital input/output signals can be transmitted in real time. This setup replaces long cable runs and significantly extends the communication range — ideal for distributed industrial systems.

Typical Use Cases:

• Integrating serial devices (barcode scanners, RFID readers, displays) into network systems
• Remote control and monitoring of systems, doors, alarms, or UPS units
• Monitoring switches, door contacts, or security sensors
• Automation of vending machines and access‑control systems

Technical Specifications

• 1× RS‑232/485 port (RxD, TxD, GND, CTS, RTS, DSR, DTR, RI, CD)
• Baud rate up to 115,200 Bd, 9‑bit support
• 2× digital inputs (galvanically isolated or 5–20 V DC)
• 2× digital relay outputs (NO/NC) – switching capacity up to 230 V / 16 A
• Communication protocols: HTTP, Telnet, TCP Server, TCP Client, Modbus/TCP
• Configuration via webserver or Telnet

The HW VSP3 software allows simple integration of the serial port as a virtual COM port (including Windows Server and 64‑bit compatibility). HW group provides an SDK with examples in C++, C#, PHP, and Java for custom development. With Modbus/TCP and RFC2217 support, smooth integration with third‑party software is ensured.

Digital Inputs and Relay Outputs

The digital inputs can capture potential‑free switch states — such as pushbuttons, door sensors, or alarm triggers. The two 16 A relay outputs can control high‑power or mains devices, such as lighting systems, door locks, or power supplies.

Rugged Design and Easy Installation

• Dimensions: 145 × 90 × 45 mm
• Housing: industrial‑grade metal
• Operating temperature: –30 °C to +85 °C
• Mounting options: DIN rail or wall mounting
• Power supply: 9–30 V DC (external adapter)

Available Versions

IP Relay HWg‑ER02b:

• IP Relay HWg‑ER02b device
• User manual
• Mounting accessories for wall or DIN‑rail installation

IP Relay HWg‑ER02b Set:

• Device + Power adapter (12 V DC)
• Serial cable
• Mounting materials
• CD with HW VSP3 software and manual

Performance and Software Integration

The IP Relay HWg‑ER02b supports M2M communication protocols such as HTTP, TCP, Modbus/TCP, and Telnet. It can easily be incorporated into higher‑level systems and act as part of a complex automation network. Through the intuitive web interface, parameters like baud rate, IP address, and trigger conditions can be configured.

Key Advantages

• Combines a serial RS‑232/485 port with two network relays
• LAN‑based control and monitoring of digital signals
• Modbus/TCP and Box‑to‑Box support for industrial applications
• Easy integration in Windows via HW VSP3 software
• Programmable SDK support for custom systems

The IP Relay HWg‑ER02b combines serial communication and relay switching in a compact, Ethernet‑enabled device. With high‑capacity 230 V / 16 A outputs, Modbus/TCP support, and Box‑to‑Box functionality, it provides a professional solution for industrial automation, SCADA integration, and security applications. Its easy configuration, durable construction, and compatibility with both HW group and third‑party software make it an essential tool for modern network‑based control systems.