Perseus Energy 242: Smart Energy Monitoring for Data Centers and Industrial Sites

Perseus Energy 242 by HW Group: Advanced Energy Monitoring and Environmental Control

On April 7, 2025, HW Group unveiled the Perseus Energy 242, the newest member of its Energy line. This compact device with a rugged metal casing is designed to monitor and manage energy consumption remotely over LAN using an integrated M-Bus Master interface. It is ideal for critical environments such as data centers, server rooms, and industrial facilities.

What is the Perseus Energy 242?

The Perseus Energy 242 is a professional-grade LAN-enabled monitoring unit offering flexible connectivity, automation capabilities, and a built-in web interface. It supports:

• LAN connection: RJ45 Ethernet port (100BASE T) with web access
• 4 x RJ11 ports (1W-UNI): For sensors like temperature, humidity, voltage, and current
• 2 Digital Inputs (DI): For dry contact detection or S0 pulse counters
• 1 Digital Output (DO): Relay for controlling devices like fans or air conditioning
• RS-485 (Modbus/RTU): For industrial device integration
• M-Bus Master interface: Supports up to 100 external utility meters
• Water Leak Detection (WLD): 1 zone input for external leak sensor cable
• Power supply: 24V DC input with power output loop

Wide Compatibility and Integration

The combination of RS 485 and M-Bus Master interfaces makes the Perseus Energy 242 capable of retrieving data from:

• Electricity, gas, and water meters
• UPS units and HVAC systems
• Environmental sensors and safety detectors

Thanks to its relay output, the device can trigger real-time responses—such as turning on ventilation or sending alerts—based on sensor thresholds.

Common Use Cases

• Data centers: Full environmental monitoring and energy usage control
• Industrial sites: M-Bus and Modbus-based energy data collection
• Server rooms: Detect overheating, leaks, power loss or fan failures
• Smart buildings: Enable automation based on environmental and utility conditions

Built-in Automation and Logic

• Conditions & Actions: Define automated responses to sensor values
• Virtual sensors: Combine or compute multiple data points internally
• Scheduler: Set triggers by time or date ranges

Communication and Security

• Open APIs: SNMP (v3), MQTT, Modbus/TCP, XML
• Advanced security: HTTPS with custom certificate, RADIUS, 802.1X, user-level access
• Alert options: SNMP traps, email, SMS or call notifications via the HWg portal
• IPv6 ready: Fully compatible with modern networks

Web Interface and Alerts

The integrated web server allows real-time access to device data and settings. It supports detailed alerting by email, SNMP traps, and portal-based notifications (including device health alerts).

FAQ – Frequently Asked Questions

1. How many external devices can I connect?

You can connect up to 100 meters or sensors with a total of 1,000 measurement values.

2. Does it support both M-Bus and Modbus simultaneously?

Yes, the M-Bus and Modbus interfaces operate independently and can be used at the same time.

3. Can I automate actions with this device?

Yes. Using Conditions & Actions, the relay output can be triggered based on specific thresholds.

4. Is it suitable for data center environments?

Absolutely. It is designed for professional use in secure, mission-critical infrastructures.

5. What happens if a leak or temperature spike is detected?

The system sends an automatic alert via email or SNMP and can activate the relay output if configured.

A Smart Solution for Energy and Environmental Monitoring

The Perseus Energy 242 is a powerful, compact monitoring platform built for modern infrastructure. With broad protocol support (M-Bus, Modbus, SNMP, MQTT), robust security features, and extensive sensor connectivity, it's a reliable choice for data centers, smart buildings, and industrial facilities looking to improve operational control and energy efficiency.