Perseus Energy 242

Perseus Energy 242: Versatile LAN Solution for Energy Monitoring and Control

The Perseus Energy 242 is an advanced LAN solution in a robust metal enclosure, specifically designed for energy monitoring and control applications in technical environments. With support for M-Bus master, Modbus/RTU, and a wide range of sensors (temperature, humidity, current, voltage, water leak detection), this device is ideal for environmental monitoring in data centers, boiler rooms, industrial facilities, or pharmaceutical warehouses.

The Perseus Energy 242 combines data from physical sensors and detectors with data from other HWg devices via LAN, and thanks to Lua scripting, calendar, and scheduling functions, it provides a flexible platform for data analysis. With the ability to process up to 100 external sensors with 1000 variables, the device is a powerful solution for professional applications.

Overview of the Perseus Energy 242

The Perseus Energy 242 is a compact device in DIN rail format, designed for monitoring and control of environmental and energy parameters. It supports a wide range of sensors, including temperature, humidity, voltage, and current sensors, as well as detectors such as smoke detectors, door sensors, or water leak detection cables. With four RJ11 ports for 1-Wire UNI sensors, one RS-485 port for Modbus/RTU, one M-Bus master port, two digital inputs (DI) with S0 pulse counters, one digital output (DO), and a WLD port for water leak detection, the device offers comprehensive connectivity options.

The unique Meters API enables reading and analysis of sensor data from other devices in the LAN, such as the STE2 R2 thermometer or SNMP-enabled UPS systems. Support for Lua scripting, calendar and scheduling functions, and an open API (SNMP, XML, Modbus/TCP, MQTT) make the Perseus Energy 242 ideal for integration into existing infrastructures. Connection with the SensDesk Portal extends functionality with advanced analysis and reporting options, while power supply is exclusively via 24V, with a 24V output for external devices.

Main Features of the Perseus Energy 242

Connectivity and Sensor Support

• Ethernet port (RJ45, 100BASE-T): The Perseus Energy 242 features an integrated web server for easy configuration and monitoring via browser interface.
• 4x RJ11 ports: Supports up to two 1-Wire UNI sensors per port for measurements such as temperature, humidity (indoor/outdoor), voltage, or current (0-30A or 4-20mA).
• RS-485 (Modbus/RTU): Enables integration of third-party sensors, such as power meters, water meters, or gas meters.
• M-Bus Master: A terminal block for direct connection of M-Bus-compatible meters (e.g., electricity, gas, water).
• WLD port: Supports a water leak detection cable with a total length of up to 185 meters.
• Digital inputs and outputs: Two digital inputs (DI) with S0 pulse counters for energy meters and one digital output (DO) for controlling relays, such as for air conditioning, ventilation, or automatic doors.
• Power supply: 24V only, with a 24V output via terminal block for external devices.

Data Processing and Analysis

The Perseus Energy 242 offers advanced data analysis features through Lua scripting, enabling the creation of custom logic. Companies can define complex conditions to monitor specific events, such as triggering an alarm if two out of three sensors exceed a critical value. Calendar and scheduling functions allow for time-controlled monitoring tasks, while virtual sensors enable calculation of averages or other aggregated data. This flexibility makes the device ideal for demanding applications in technical rooms and industrial environments.

Alarms and Notifications

The Perseus Energy 242 offers versatile alarm options that can be triggered both locally and over the network:

• Local alarms: Relay outputs (DO) can be switched based on sensor data, e.g., to activate fans or alarm sirens.
• Network-based alarms: SNMP Trap and email notifications can be sent directly from the device (SMTP server required). SMS or call notifications are possible via an external SMS gateway.
• Portal notifications: When connected to the SensDesk Portal, additional features such as device invalid alerts, PDF reports, and multi-year multigraphs are available.

Open API and Integration

The open API (SNMP, XML, Modbus/TCP, MQTT) allows seamless integration of collected data into existing SCADA or NMS systems. The Meters API is a unique feature that allows the Perseus Energy 242 to read sensor data from other devices on the LAN. For example, the device can compare the temperature of its own 1-Wire UNI sensor with that of an external STE2 R2 thermometer or an SNMP-enabled UPS to trigger precise alarms. This data aggregation makes the Perseus Energy 242 ideal for complex monitoring scenarios.

Security Features

Security was a top priority in the development of the Perseus Energy 242:

• Radius – IEEE 802.1X: Supports secure network authentication.
• HTTPS with client certificate: Ensures encrypted communication.
• Admin and user accounts: Allows access control for different user groups.
• IPv6 support and SNMP v3: For modern and secure network environments.

Connection with the SensDesk Portal

Integration with the SensDesk Portal significantly extends the functionality of the Perseus Energy 242. The portal offers:

• Graphs and multigraphs: Visualization of sensor data with historical trends.
• Virtual sensors: Calculation of averages or other aggregated data.
• Device invalid alerts: Notification in case of device connection loss.
• PDF reports: For audits and reporting in regulated industries.
• Multi-user accounts: For teams with different access rights.

The SensDesk Portal is available as both a SaaS solution and on-premise. For simple applications, the free HWg-cloud.com portal offers basic features such as email alerts and simple graphs.

Typical Applications

The Perseus Energy 242 is suitable for a variety of scenarios where precise environmental and energy monitoring as well as control are required. Here are some of the most common use cases:

• Boiler rooms: Monitoring temperature, humidity, and energy consumption (e.g., via M-Bus meters).
• Industrial facilities: Monitoring machines and environmental conditions to ensure operational safety.
• Pharmaceutical warehouses: Ensuring compliance by monitoring temperature and humidity.
• Greenhouses: Monitoring environmental parameters such as temperature and humidity to optimize plant growth.
• Technical rooms: Integration of sensors for current, voltage, or water leak detection to ensure operational safety.
• Infrastructure monitoring: Data collection from local sensors and meters at remote sites.

A typical example is monitoring a boiler room. The Perseus Energy 242 can connect temperature sensors via the RJ11 ports, a power meter (Modbus/RTU) via RS-485, and a gas meter via the M-Bus master. Additionally, the device can monitor the battery status of an external UPS via SNMP using the Meters API. An alarm can be configured to trigger if two out of three sensors exceed a threshold, and the notification can be sent by email or via the SensDesk Portal.

Advantages of the Meters API

The Meters API is a unique feature of the Perseus product line. It enables the device to read sensor data from other devices on the same LAN network and use it for analysis or alarms. This is especially useful in complex environments where multiple devices provide data. For example, the Perseus Energy 242 can compare the temperature of its own sensor with that of an external STE2 R2 thermometer and include data from an SNMP-enabled UPS. This data aggregation enables more precise decisions and alarms based on multiple data sources.

M-Bus Master Functionality

The M-Bus master port is a key feature of the Perseus Energy 242. It allows direct connection of M-Bus-compatible meters, such as electricity, gas, or water meters, making the device particularly suitable for energy monitoring applications. In combination with the RS-485 interface and the Meters API, the Perseus Energy 242 can collect data from various meters and sensors and integrate them into a unified monitoring system.

Mobile Monitoring with the HWg Monitor App

The HWg Monitor App (available for Android and iOS) provides a convenient way to monitor all sensor data at a glance. The app can connect directly to the Perseus Energy 242 or via the SensDesk Portal. It displays all sensor values on one screen and is ideal for mobile monitoring or as a wall display in technical rooms. With the app, responsible personnel can check the status of their monitored environments anytime and anywhere.

The Perseus Energy 242 is a versatile and powerful solution for remote monitoring and energy monitoring in technical and industrial environments. With its ability to integrate a wide range of sensors and meters via RJ11, RS-485, and M-Bus master, as well as support for Lua scripting, SNMP Trap, Modbus/RTU, and the unique Meters API, this device is ideal for complex monitoring and control applications.

Integration with the SensDesk Portal extends functionality with advanced analysis and reporting options, while the robust design and secure communication protocols ensure reliability and security. The Perseus Energy 242 is the perfect choice for companies needing a flexible and scalable solution for monitoring environmental and energy parameters.

Technical Data at a Glance

• Ethernet: RJ45 (100BASE-T), integrated web server
• Sensor ports: 4x RJ11 (max. 2 1-Wire UNI sensors per port), 1x RS-485 (Modbus/RTU), 1x M-Bus master
• Sensors: Temperature, humidity, voltage, current (0-30A or 4-20mA), and more
• WLD: 1 zone for water leak detection (up to 185m cable)
• Digital inputs/outputs: 2x DI (dry contacts with S0 pulse counters), 1x DO (relay)
• Detectors: Smoke detectors, door sensors, fan failure, power presence, and more
• Alarm options: Email, SNMP Trap, SMS/calls (with external SMS gateway)
• API: SNMP, XML, Modbus/TCP, MQTT
• Security: Radius (IEEE 802.1X), HTTPS, admin/user accounts
• Data processing: Lua scripting, conditions & actions, scheduler
• Power supply: 24V, with 24V output
• Portal: SensDesk (SaaS or on-premise), HWg-cloud.com
• Mobile App: HWg Monitor (Android/iOS)

Available Versions:

Perseus Energy 242:

• Perseus 242 device. Energy metering gateway: metal enclosure, M-Bus, RS485 Modbus-RTU, Meters API. Requires external 24V power supply, power adapter NOT included.

Perseus Energy 242 set:

• Perseus 242 energy gateway starter set. Includes: Perseus Energy 242 as above and 24V EU power adapter with 2-pin plug.