The HW group Poseidon S‑Hub is a compact, reliable splitter designed for easy connection and organization of RS‑485 sensors. With up to eight RJ45 ports, it enables the parallel connection of multiple sensors to Poseidon devices — such as the Poseidon2 4002 — providing a clean star‑wiring structure. This design greatly simplifies the installation of large monitoring networks.

Thanks to its rugged construction, cascading capability, and reliable RS‑485 bus technology, the Poseidon S‑Hub is perfect for server‑room monitoring, industrial applications, and building automation. Power can be supplied directly from the Poseidon unit or via an optional external power adapter, making it ideal for extended installations with multiple sensors.

Key Features of the Poseidon S‑Hub

• Connect up to 8 sensors: Eight RJ45 ports for RS‑485 sensors such as temperature, humidity, or smoke detectors
• RS‑485 bus support: Reliable communication over distances up to 1000 m
• Star topology: Uses standard CAT5‑TP cables for neat, flexible wiring
• Cascading: Option to daisy‑chain multiple hubs for system expansion
• LED indicators: Bus power (green) and external power (red)
• Flexible power supply: Direct from Poseidon or optional power adapter (9–30 V DC, recommended for 3+ sensors)
• Compact design: 100 × 70 × 25 mm, durable housing for industrial use

Function and Applications

The Poseidon S‑Hub simplifies installation and management of RS‑485 sensors by providing a straightforward star‑topology configuration using RJ45 connectors instead of a traditional bus layout. This saves time, reduces installation errors, and makes maintenance and expansion much easier.

Typical Applications:

• Server rooms & data centers – connecting temperature, humidity, and smoke detectors for stable operating conditions
• Industrial sites – integrating RS‑485 sensors for process and machinery monitoring
• Building management – logging climate and environmental parameters in HVAC or energy‑management systems
• Remote monitoring – connected to Poseidon2 for alerts and status messages via LAN, email, SMS, or SNMP
• Security monitoring – linking smoke, door, and water‑leak detectors in safety installations

Technical Details

• Ports: 8× RJ45 for RS‑485 sensors, 1× RJ45 for Poseidon master unit
• Interface: RS‑485 (max cable length: 1000 m)
• Topology: Star layout with option to cascade multiple S‑Hubs
• Power supply: Via RS‑485 bus or external adapter (9–30 V DC)
• Jumper settings: Last sensor set to “LAST,” all others to “MIDDLE”
• LED indicators: Green = bus power, Red = external power
• Compatibility: Poseidon2 4002, Poseidon 2250, Poseidon 1250, and other HW group RS‑485 devices
• Operating temperature: –40 °C to +85 °C
• Humidity: 5–90 % RH (non‑condensing)
• Dimensions: 100 × 70 × 25 mm
• Weight: ~150 g

Integration with HW group Systems

The Poseidon S‑Hub is fully compatible with HW group Poseidon‑series monitoring systems, enabling simultaneous connection and operation of multiple sensors whose data is transmitted in real time over LAN, GSM, or SNMP to central systems. This supports site‑wide monitoring structures ideal for large facilities or multi‑floor buildings.

Via the SensDesk.com platform, all connected sensors can be centrally visualized and monitored. HWg‑PDMS software also allows measurement data to be exported to Excel for maintenance, documentation, or audits — seamlessly integrating the S‑Hub into existing IoT and monitoring infrastructures.

Installation and Setup

1. Connect the Poseidon S‑Hub via RJ45 cable to the Poseidon2 master unit
2. Attach up to eight RS‑485 sensors to RJ45 ports 1–8 of the hub
3. Set the last sensor to “LAST” and all others to “MIDDLE”
4. For more than three sensors, use an external power supply (e.g., HWg‑600528)
5. Check LED indicators: Green = bus‑power, Red = external power supply

Advantages at a Glance

• Easy connection and expansion of RS‑485 sensors
• Ideal for star and cascade wiring structures
• Compatible with all Poseidon devices
• Reliable RS‑485 communication up to 1000 m
• Flexible power options and durable design
• Fast, secure installation with standard RJ45 cabling

The HW group Poseidon S‑Hub is the ideal solution for reliable connection and organized setup of RS‑485 sensors in HW group monitoring systems. Its star‑wiring capability, cascading support, and flexible power options deliver maximum scalability for industrial monitoring, server‑room climate control, or building management. Combined with Poseidon2, SensDesk, and HWg‑PDMS, the S‑Hub is a key tool for precise sensor data collection and centralized network monitoring.