Description
Perseus Energy 240 – Affordable LAN Monitoring & Modbus Gateway
The Perseus Energy 240 is the simplest and most cost-effective Perseus LAN monitoring device. It is designed to connect HW Group and third-party RS-485 Modbus/RTU sensors to a SensDesk Technology-based Portal. Additionally, it can function as a Modbus/RTU to Modbus/TCP gateway.

Key Features
- Connect up to 100 Meters & 1,000 Variables
Supports data collection via RS-485 (Modbus/RTU). - Multi-Protocol Data Access
Reads data from other network devices via SNMP, Modbus/TCP, MQTT, and XML (for HWg devices). - Flexible Data Processing & Analysis
Local alarms, conditions, Lua scripting, and scheduled tasks enable powerful data analysis. - Modbus RTU to TCP Gateway
Acts as a bridge between physical Modbus/RTU (RS-485) and Modbus/TCP (LAN) for easy data integration into third-party monitoring systems. - Compact & Cost-Effective Design
As a pure gateway, the Perseus Energy 240 features only an RS-485 interface, no RJ11 ports, and no digital inputs (DI).
Ideal for Third-Party Sensor Integration
The Perseus Energy 240 LAN gateway is perfect for integrating RS-485 Modbus/RTU sensors into an existing remote monitoring system. Data can be sent to any SensDesk Technology-based Portal or connected via:
✔️ RS-485 (Modbus/RTU)
✔️ LAN (SNMP, Modbus/TCP, MQTT) via the Meters API
With its RS-485 Modbus/RTU input (Meters API) and Modbus/TCP output (Open API), the device acts as a gateway between Modbus RTU (RS-485) and Modbus/TCP (LAN). Measured data can be:
✔️ Analysed locally
✔️ Sent to the Portal
✔️ Used in third-party SCADA or SNMP-based NMS systems
Standalone & Portal-Based Alerts
- On-Device Alerts: Alerts can be triggered directly via SMS, phone call, or email.
- Portal-Based Alerts & Reporting:
- SensDesk Technology enables graphing, virtual sensors, PDF reports, and device status monitoring.
- Alerts can be issued for invalid device states or unusual sensor readings.
- Open API (SNMP, MQTT, Modbus/TCP, XML) ensures seamless data sharing.

Typical Applications
✔️ Modbus RTU to TCP gateway
✔️ Remote machine monitoring
✔️ Warehouse & storage environmental monitoring
✔️ Technical room/site monitoring
✔️ Data concentrator for remote sensors & meters
✔️ Cabinet & telecom site environmental monitoring
✔️ Pharmaceutical storage monitoring
✔️ Base transceiver station monitoring
✔️ Greenhouse monitoring
The Perseus Energy 240 is a reliable, scalable, and cost-efficient solution for integrating Modbus/RTU sensors into modern monitoring systems.
HW Group Cloud Portals

Free HWg-cloud.com portal service:
- Send email alerts from the portal (e.g., for a missing sensor) with long-term reliability.
- Alerts for disconnected or invalid devices are available via email.
- View a single-value graph with short history.
- Alarm escalation via email supported.
- Remote relay output switching based on sensor data.
- Centralised alert overview and management.
- Free service provided by HW Group.


Paid portal service:
- Includes all features of HWg-cloud.com.
- Alerts via email, SMS, and voice calls.
- Virtual sensors in the portal (e.g., averaging multiple sensors).
- Multi-graph support with several years of historical data.
- User account API available via SNMP or XML.
- Automated reports in PDF format.
- Multi-user account support.
- SensDesk.com (SaaS service) is available, or you can use any other portal provider.
- SensDesk Portal On-Premise – run your own portal on your server.











5 Devices | 1 User | 30 Day Log | 1 Report




Perseus Energy 240 – Affordable LAN Monitoring & Modbus Gateway






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