The HW group Relay Output 1W‑UNI is a smart expansion module designed to enhance the functionality of the HWg‑Ares 12. With four bistable relay outputs, it enables precise remote control of external equipment such as alarm systems, climate systems, or backup power supplies. Combining rugged hardware, energy‑efficient relay design, and full integration into the SensDesk portal, this module is ideal for industrial, mobile, and IoT monitoring applications.

Functionality and Applications

The Relay Output 1W‑UNI adds four controllable NO/NC relays to the HWg‑Ares series, configurable both locally and remotely. Each relay supports up to 50 V / 1 A load. Thanks to its bistable design, power is only consumed when switching — perfect for battery‑powered or energy‑efficient systems.

The module supports manual control (e.g., via SMS commands or SensDesk portal) and automated actions triggered by sensor data or alarm thresholds from the HWg‑Ares 12, enabling intelligent, real‑time rule‑based control.

Typical Use Cases:

• Alarm systems – activating audible or visual warnings in response to alarms
• Climate control – operating heating or cooling systems based on temperature thresholds
• Backup power – automatic switching to reserve power during outages
• Industrial processes – remote activation of devices, valves, or control systems
• Mobile IoT projects – controlling remote or temporary installations without LAN

Technical Specifications

• Relays: 4× bistable NO/NC (up to 50 V / 1 A load)
• Control: Manual via SMS or SensDesk, automated through sensor alarms or local logic
• Update interval: Every 3 seconds
• Connection: RJ11 1‑Wire UNI bus; occupies four sensor positions on HWg‑Ares 12
• Max modules: Two Relay Output 1W‑UNI per RJ11 port (total eight relays)
• Power supply: Via bus or external 5 V adapter (e.g., “1‑Wire Hub Power”)
• Compatibility: HWg‑Ares 12 (Plain/Tset), SensDesk portal, HWg‑PDMS software
• Compact, installation‑friendly design

Bistable Relays – Energy‑Efficient and Fail‑Safe

The module’s bistable relays consume power only during switching, significantly reducing overall system energy use. Relays maintain their state during power loss — crucial for uninterrupted operations. Configurable as either normally open (NO) or normally closed (NC), the outputs can be tailored to specific applications.

Integration with HWg‑Ares 12

The Relay Output 1W‑UNI connects directly via the 1‑Wire UNI bus to HWg‑Ares 12, using four sensor slots and is auto‑detected by the device. Configuration and control are handled through the web interface or SMS commands. Up to two modules can be connected simultaneously, enabling eight remotely controlled relays.

For multiple modules or longer bus connections, an external 5 V adapter is recommended to ensure stable power. The 3‑second update rate per relay is optimal for most automation and monitoring tasks.

Intelligent Alarm and Control Logic

Relay actions can be linked directly to sensor readings: when a temperature sensor exceeds its threshold or a dry contact input is triggered, relays can automatically perform switching operations, activating cooling systems, sending alerts, or switching energy sources without human intervention. Manual overrides are available anytime via SensDesk or SMS.

Advantages of the Relay Output 1W‑UNI

• Energy‑efficient bistable relays (power only during switching)
• Reliable control of external systems with backup function during outages
• Plug‑and‑play integration with HWg‑Ares 12 and SensDesk
• Expandable to eight remote‑controlled relays via RJ11 bus
• Ideal for IoT, mobile, and industrial automation
• Fully compatible with HWg‑PDMS and alert systems

SensDesk and IoT Compatibility

Fully integrated into the SensDesk portal, the module offers centralized control, monitoring, and data analysis. Relay states can be managed in real time, alarm conditions adjusted, and sensor histories viewed up to two years back.

Using the HWg‑Push protocol, the module communicates securely over GSM/GPRS networks, optimized for IoT monitoring. This ensures reliable operation for remote sites without wired infrastructure.

Example Applications

• Server rooms – automatic activation of backup ventilation or cooling systems on temperature alerts
• Industrial plants – remote machine or process control over GSM
• Food & logistics – triggering alarms when temperatures vary
• Museums & archives – climate system control to protect delicate exhibits
• Mobile IoT installations – energy and security management for vehicles and temporary sites

The Relay Output 1W‑UNI extends the HWg‑Ares 12 with robust relay control capabilities, providing maximum energy efficiency, reliability, and flexibility. With seamless integration into SensDesk, bistable relay technology, and broad compatibility, it is the ideal choice for industrial and mobile environments requiring energy‑efficient remote automation and monitoring. Whether for security systems, climate control, or backup power management, this module offers a powerful expansion for modern monitoring infrastructures.