Perseus Energy 240
€298.90
The simplest and most affordable LAN gateway of the Perseus family
The HW group 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 the SensDesk Technology-based portal. The Perseus 240 supports up to 100 meters with 1,000 variables connected via RS-485 (Modbus/RTU).
It can additionally read values from other network devices via generic SNMP, Modbus/TCP, MQTT, and XML (for HWg devices) and evaluate the measured data from RTU or LAN devices using local alarms, conditions and actions as well as Lua scripts on the device itself. The Perseus Energy 240 is a pure gateway: it has only an RS-485 interface – no RJ11 ports and no digital inputs (DI).
Modbus/RTU sensors and other network devices in one system
The Perseus Energy 240 is ideal for connecting third-party RS-485 sensors (Modbus/RTU) to an existing remote monitoring site. It can be used as a Modbus RTU-to-TCP gateway or as a Modbus/RTU-to-MQTT or SNMP converter.
RS-485 (Modbus/RTU)
4-pin terminal block with 12V for connecting HW group and third-party Modbus/RTU sensors, e.g. electricity meters, temperature or humidity sensors.
Meters API
Additionally reads sensor data from other HWg and third-party devices on the same LAN (SNMP, Modbus/TCP, MQTT, HWg XML).
Modbus Gateway
Converts Modbus/RTU (RS-485) to Modbus/TCP (LAN) and can thus be integrated into SCADA or SNMP-based NMS systems.
No RJ11, no DI
Unlike other Perseus devices, the Perseus 240 has only the RS-485 interface – no 1-Wire connection and no digital inputs.
Individually selectable: base unit or starter set
The Perseus Energy 240 is available either as a pure base unit or as a complete starter set with power adapter. The desired option must be selected in the shopping cart.
Please note: The base unit "Perseus Energy 240" does not include a power adapter. Only the "Perseus Energy 240 set" variant includes a universal power adapter. The option must be selected in the shopping cart.
Perseus Energy 240
Perseus 240 unit. Energy meter GW: metal housing, RS485 Modbus-RTU, meters API. Power adapter is not included.
Perseus Energy 240 set
Perseus 240 energy GW starter set. Includes: Perseus Energy 240 as above plus a universal power adapter 12V/1.5A.
How the Perseus Energy 240 is designed
The robust metal housing is compact at approximately 145 x 121 x 38 mm (W x H x D) and about 488 g, with IP40 protection rating and designed for operating temperatures from -30°C to 85°C.
Metal housing
Robust metal housing for IT, SoHo and industrial environments, can be placed on a desk or mounted in a 1U rack with the optional "Mount plate F-1U" mounting plate (available separately).
Ethernet connection with web server
One RJ45 Ethernet port (100BASE-T) connects the device to the network; an integrated web server enables configuration directly via the browser.
RS-485 connection
One 4-pin RS-485 terminal block (including 12V) for connecting Modbus/RTU sensors – the only physical sensor interface of the device.
Power supply
The Perseus Energy 240 is supplied with 9–30 V DC either via a barrel jack (2.1/5.5 mm) or a terminal block (power consumption approx. 500 mA). A matching 12V/1.5A adapter is only included with the "set".
Status indicators
LEDs on the front of the device indicate the operating and alarm status of the device.
Evaluate sensor data from other LAN devices as well
The Meters API is a unique feature of the Perseus product range: the device additionally reads sensor values from external LAN devices and includes them in analyses and alarms.
- Readable protocols: HWg XML, Modbus/TCP, SNMP, MQTT
- Examples of supported third-party devices: STE2 LITE, Poseidon2 4002, Damocles2 1208, NETIO PowerPDU 8QS, SNMP-capable UPS systems
- Use as Modbus RTU-to-TCP gateway or Modbus/RTU-to-MQTT/SNMP converter
- Integration of measured data into third-party SCADA or SNMP-based NMS systems
In addition, the Perseus Energy 240 supports integration into building automation systems via BACnet/TCP as well as IPv6 for modern, future-proof network environments.
Notification of critical events
The Perseus Energy 240 offers both standalone and network-based alarm options.
Standalone device alarms
SNMP trap and e-mail directly from the device (SMTP server required); SMS and call alarms can be realized via an external SMS gateway (e.g. SMS-GW3).
Portal alarms (SensDesk)
Additionally e-mail, SMS, voice calls, device failure alert (Device Invalid Alert), alarm escalation and PDF reports.
Open API
The Perseus Energy 240 can provide all measured values individually via the open API (SNMP, MQTT, Modbus/TCP, XML).
Advanced conditions
Variables can be assigned multiple conditions and actions to implement differentiated alarm logic.
Lua scripting, conditions and schedules
For individual evaluation logic, the Perseus Energy 240 includes several tools.
- Local, user-defined scripts in Lua
- Variables with multiple conditions and actions
- Calendar- or period-based scheduler
- Template repository for third-party sensors
- Virtual sensors as well as unit conversion and calibration offset
- Integrated logger with 32 MB memory
Secure authentication and encryption
- Radius authentication according to IEEE 802.1X
- HTTPS with customer certificate
- Admin and user accounts with separate access rights
- IPv6 support as well as SNMP v1 and v3 (including SNMP traps)
From free cloud access to your own portal instance
The Perseus Energy 240 can optionally be connected to the SensDesk portal and thus expanded with central evaluation and management functions.
HWg-cloud.com
Free portal service with e-mail alarms, device failure alert and a value graph with short history.
SensDesk.com / Portal Provider
Paid portals with e-mail, SMS and voice call alarms, virtual sensors, multi-graphs over several years, PDF reports and multi-user accounts.
Portal On-Premise
Standalone SensDesk installation on your own server for companies with special data protection requirements.
HWg Monitor App
Mobile app for iOS and Android, displays all sensor values at a glance – also usable as a wall display in the technical room.
Commissioning in a few steps
Setting up the Perseus Energy 240 is done entirely via the web browser.
- Place the device on a desk or optionally mount it in a rack with the "Mount plate F-1U" mounting plate
- Connect the power supply (9–30 V DC, power adapter already included with the "set")
- Connect the device to the network via Ethernet cable
- Open the device’s IP address in the browser (initial search possible e.g. with HWg-Config)
- Connect Modbus/RTU sensors to the RS-485 terminal block
- Optional: Configure alarm rules, Lua scripts or the connection to SensDesk/HWg-cloud.com
- Optional: Set up use as a Modbus RTU-to-TCP gateway or as a Modbus/RTU-to-MQTT/SNMP converter
Why the Perseus Energy 240 is the right choice
Simple and affordable
The simplest and most cost-effective device in the Perseus family.
Modbus Gateway
Converts Modbus/RTU (RS-485) to Modbus/TCP, MQTT or SNMP.
Meters API
Additional evaluation of sensor data from other LAN devices.
Open standards
SNMP, Modbus/TCP, MQTT, XML and BACnet/TCP.
Robust metal housing
Designed for operating temperatures from -30°C to 85°C.
24 months warranty
According to the manufacturer with 24 months warranty from the date of purchase.
Practical application examples
- Modbus gateway (Modbus RTU to TCP)
- Remote monitoring of machines
- Environmental monitoring of warehouses and storage rooms
- Remote monitoring of technical rooms (sites)
- Data concentrator for all local sensors and meters at a site
- Environmental monitoring in control cabinets or telecom sites
- Pharmaceutical storage and environmental monitoring
- Remote monitoring of base stations and greenhouses
Practical example: In a warehouse with cold rooms, several Modbus/RTU-compatible temperature sensors are connected to the Perseus Energy 240 via RS-485 to monitor the temperature. In addition, the device reads the battery status of an SNMP-capable UPS via the Meters API. An alarm is triggered as soon as a sensor exceeds a threshold, and the notification is sent by e-mail or via the SensDesk portal.
Frequently asked questions
What is the HW group Perseus Energy 240 and what is it used for?
The Perseus Energy 240 is the simplest and most cost-effective LAN monitoring device in the Perseus family. It is used to connect HW group and third-party RS-485 Modbus/RTU sensors to the SensDesk Technology-based portal and can additionally be used as a Modbus RTU-to-TCP gateway.
What is the difference between the base unit and the "set"?
The base unit "Perseus Energy 240" does not include a power adapter. The "Perseus Energy 240 set" variant additionally includes a universal power adapter (12V/1.5A). The desired option must be selected in the shopping cart.
Which sensors can be connected to the Perseus Energy 240?
The Perseus Energy 240 has only an RS-485 connection for Modbus/RTU sensors – unlike other Perseus devices, it has no RJ11 ports for 1-Wire sensors and no digital inputs (DI). In total, the device supports up to 100 meters or 1,000 variables, among other things through the additional integration of devices via the Meters API.
What exactly is the Meters API?
The Meters API is a special feature of the Perseus product range: in addition to the sensors connected directly to the RS-485, the device can also read values from other devices on the same LAN, for example from other HWg devices, SNMP-capable UPS systems or network PDUs, and include this data in its own analyses and alarms.
Can the Perseus Energy 240 be used as a Modbus gateway?
Yes. With RS-485 (Modbus/RTU) as data input via the Meters API and Modbus/TCP as output via the open API, the Perseus Energy 240 can be used as a gateway from physical Modbus/RTU (RS-485) to Modbus/TCP (LAN), as well as a Modbus/RTU-to-MQTT or SNMP converter.
How is the Perseus Energy 240 powered?
The device requires a DC voltage of 9–30 V, either via a barrel jack or a terminal block. A matching 12V/1.5A power adapter is only included with the "set"; with the base unit it must be obtained separately.
What security features does the device offer?
The Perseus Energy 240 supports Radius authentication according to IEEE 802.1X, HTTPS with customer certificate, separate admin and user accounts as well as IPv6 and SNMP v1/v3 including SNMP traps.
Questions about the Perseus Energy 240?
Our support team in Germany will advise you free of charge on selection, sensors and configuration.
- Perseus Energy 240:
Perseus 240 Base Unit - WITHOUT AC adapter - Perseus Energy 240 set:
Perseus 240 Base Unit - INCLUDES Universal AC Adapter 12V 1.5A
- 1× RS-485 (Modbus/RTU) – 4-pin terminal block with 12V
- Ethernet RJ45 (100BASE-T)
- No RJ11 ports
- No DI (digital inputs)
Meters API Support:
- HWg XML
- Modbus/TCP
- MQTT
- SNMP
Alarm Functions:
- SNMP Trap
- SMS / Calls (with external SMS gateway)
Open API:
- SNMP
- XML
- Modbus/TCP
- MQTT
Security Features:
- IPv6 support
- SNMP Traps
- SNMPv3
- Radius – IEEE 802.1X
- Admin and user accounts
- HTTPS (client certificate)
Technical Specifications:
- Power supply: 9-30V (12V, 1.5A)
- Operating temperature: -30°C to 85°C (-22°F to 185°F)
- Enclosure: Metal, 38 × 121 × 145 mm
- Warranty: 24 months
Capacity Limits:
- Supports up to 100 sensors with 1000 variables
Gateway Functionalities:
- Modbus RTU to TCP gateway
- Modbus/RTU to MQTT converter
- Modbus/RTU to SNMP converter
- RS-485 (Modbus/RTU) as data input
- Modbus/TCP as output via Open API
Data Sources:
- RS-485 (Modbus/RTU) sensors
- Network devices via generic SNMP
- Modbus/TCP devices
- MQTT devices
- XML (for HWg devices)
Additional Features:
- Local Lua scripts
- Calendar-based scheduler
- Template repository for third-party sensors
- Variables with multiple conditions and actions
- Unit conversion
- Local alarms, conditions, and actions
Typical Applications:
- Modbus gateway (Modbus RTU to TCP)
- Remote machine monitoring
- Environmental monitoring of warehouses / storage rooms
- Remote monitoring of technical rooms
- Data concentrator for local sensors/meters
- Environmental monitoring in cabinets or telco sites
- Pharmaceutical/warehouse environmental monitoring
- Remote monitoring of base stations
- Greenhouse monitoring
Manufacturer information:
HW group s. r. o.
Rumunská 26
Prague, 120 00
Czech Republic
Phone: +420 222 511 918
Email: sales@hwg.cz
Responsible person:
Didactum® Security GmbH
Im Mühlenfeld 4
48163 Münster
Deutschland
Fon:
(+49) 250 19 71 63 54 / (+49) 171 33 11 577
Email: info@didactum-security.de
