Expander 4xDI - Expansion for digital inputs
€113.20
Expander 4xDI 1W-UNI: Expansion for Digital Inputs in Monitoring Systems
The HW-group Expander 4xDI 1W-UNI is a compact expansion module designed to connect up to four potential-free contact inputs (dry contacts) to HW-group devices such as Poseidon2 or Ares. Via the 1-Wire UNI bus (RJ11), additional detectors such as door sensors, smoke detectors, or push buttons can be connected to expand server room monitoring and remote monitoring. The expander is ideal for applications in data centers, industrial facilities, or building management systems and supports daisy-chaining of multiple units for maximum flexibility. With its robust industrial design (optional metal housing in the Industrial version) and easy installation, the expander is the perfect solution for sensor expansion.
Main Features of the Expander 4xDI 1W-UNI
The Expander 4xDI 1W-UNI offers a reliable way to integrate digital inputs into existing monitoring systems. Here is an overview of the key features:
- Four digital inputs: Connection of up to four potential-free contacts (NO/NC dry contacts) for detectors such as door sensors, smoke detectors, or push buttons.
- 1-Wire UNI bus: Connection via RJ11 (2x RJ11 for daisy-chaining), compatible with Poseidon2 integration and Ares devices.
- Daisy-chaining: Multiple expanders can be connected in series to increase the number of inputs (max. 2 units per active port without external power supply).
- Power supply: Bus-powered via the 1-Wire UNI bus or optionally with external 5V power supply for higher power requirements.
- Robust design: Compact dimensions (65 x 80 x 30 mm, 70 g) and optional metal housing (Industrial version) for use in demanding environments.
- Easy installation: Supplied with a 3 m RJ11 cable for immediate commissioning.
Application Areas of the Expander 4xDI 1W-UNI
The Expander 4xDI 1W-UNI is versatile and suitable for scenarios where additional digital inputs are needed. Typical application areas include:
- Server rooms and data centers: Expansion of monitoring by connecting door sensors, smoke detectors, or other safety detectors to detect unauthorized access or hazards.
- Industrial facilities: Integration of push buttons or detectors for monitoring machines or access points.
- Building management: Connection of dry contacts for monitoring doors, windows, or other access points.
- Remote monitoring: Integration with Poseidon2 or Ares for real-time notifications via email, SMS, or SNMP trap when input status changes.
- Sensor expansion: Expansion of the capacity of monitoring systems with additional digital inputs.
Why the Expander 4xDI 1W-UNI is the Right Choice
The Expander 4xDI 1W-UNI offers a flexible and reliable solution for expanding monitoring systems. Compared to other expansion modules, it stands out due to its easy integration into the 1-Wire UNI bus, the possibility of daisy-chaining, and its robust design. Compatibility with HW-group devices such as Poseidon2 and Ares enables seamless connection to existing systems, while support for dry contacts allows a wide range of detectors. The compact size and easy installation make it ideal for use in server rooms, industrial facilities, and building management systems.
Technical Details
- Inputs: 4x dry contact (NO/NC, sensitivity: 0–500 Ω for ON state)
- Interface: 1-Wire UNI (2x RJ11 for daisy-chaining)
- Compatibility: Poseidon 2250, Poseidon 4002, Poseidon2, Ares 12/14
- Sensor allocation: Reserves 4 sensor positions on the 1-Wire UNI bus (even if fewer than 4 inputs are used)
- Sampling period: Status of the digital inputs is updated once per second
- Power supply: Bus-powered via RJ11 or external 5V power supply (required when using more than two expanders)
- Maximum cable length: 60 m total length from the active port of the Poseidon/Ares unit
- Operating environment: -40 °C to +85 °C, 5% to 90% relative humidity (non-condensing)
- Dimensions/Weight: 65 x 80 x 30 mm, 70 g
- Accessories: Includes 3 m RJ11 cable
- Connection: Connection via digital inputs (dry contact) to Poseidon2, Ares, or STE2
Integration with HW-group Products
The Expander 4xDI 1W-UNI is optimally matched to HW-group devices such as Poseidon2, Ares, STE2, or Damocles. By connecting via the 1-Wire UNI bus, you can build a comprehensive security system that reports alarms from dry contacts in real time via LAN, GSM, SNMP, or Modbus/TCP. The free HWg-PDMS software enables analysis and export of data to Excel for detailed reports. Connection to the SensDesk portal offers additional visualization options via Android or iOS apps.
Installation and Setup
Installation of the Expander 4xDI 1W-UNI is simple and straightforward. The expander is connected via an RJ11 cable (included) to the 1-Wire UNI bus of Poseidon2 or Ares devices. Up to four dry contacts (e.g., door sensors or smoke detectors) can be connected to the IN1–IN4 inputs. Power is supplied via the bus or an optional 5V power supply if more than two expanders are used. Alarms can be configured individually for each input in the Poseidon or Ares unit. Daisy-chaining multiple expanders allows for flexible system expansion.
The HW-group Expander 4xDI 1W-UNI is the ideal solution for expanding digital inputs in server rooms, industrial facilities, and building management systems. With its compatibility with Poseidon2 and Ares, support for dry contacts, and daisy-chaining capability, it offers reliable sensor expansion for remote monitoring. Optimize your server room monitoring with the Expander 4xDI 1W-UNI.
Product Features:
- Expansion module with 4 dry contact digital inputs
- Connection for push buttons, smoke detector relays, etc.
- Compatible with Ares, Poseidon 2250, Poseidon 4002, and all Poseidon2 products
- Can be combined with other sensors
Bus Specifications:
- Bus type: 1-Wire UNI
- Supported by: Ares, Poseidon2, Poseidon 2250, 4002
- Sensor allocation: Reserves 4 sensor positions from the 1-Wire bus limit
- Connection: 2x RJ11 (bus input & bus output for next sensor)
- Max. distance: 60 m total cable length from the active port
Power Supply:
- Supplied via RJ11 bus
- In some cases, external 5V power supply required
- Max. 2 expander units per active port (Poseidon or Ares RJ11)
- Power boost via external 5V power supply or "1-Wire Hub Power"
4x Digital Inputs:
- Connections: IN1 – IN4
- Type: Digital input (supports NO/NC dry contact)
- Sensitivity: 1 (On) = 0-500 Ω (COM pin connected to GND of the 1-Wire UNI bus)
- Sampling period: DI status is updated once per second
- Galvanic isolation: Digital inputs are NOT electrically isolated from the 1-Wire UNI bus
Physical Parameters:
- Operating conditions: -40 to +85°C (-40 to 185°F)
- Relative humidity: 5 to 90%
- Dimensions: 65 x 80 x 30 mm
- Weight: 70 g
Accessories:
- 3 m cable with 2x RJ11 included
Installation:
- Allocation: Always occupies 4 sensor positions on the bus, regardless of the number of inputs actually used
- Expansion: For more than 2 expander units, use an external power supply or "1-Wire Hub Power"
- Can be combined with other 1-Wire sensors on the same bus
Safety Instructions:
- Do not exceed a maximum cable length of 60 m
- For more than 2 expander units, use external power supply
- Digital inputs are not galvanically isolated – take appropriate precautions
- Note sensor limitation: Each unit blocks 4 sensor positions
Further monitoring devices
Available sensors
Accessories
Mounting Plate D Bracket for Ares and Poseidon2 Operating environment: -3°C - 85°C / 0%RH - 100%RH Storage environment: -30°C - 60°C / 5%RH - 95%RH Dimensions: 74 x 6 x 120 (W x H x D) / 58g Warranty: 24 months Wall mounting plate for Ares, Poseidon2 3266/68 and other products.
DB9 LapLink Cable 2m A LapLink cable (also known as Lablink or null-printer cable) is a cable used to connect two computers directly via a cable connection. Housing: Plastic Type: Cable
DIN-Rail Box Set A mounting kit for installing HW-group devices on a DIN rail. Applications and Use: Mounting kit for installing HW-group devices with metal housing on a DIN rail. Operating environment: -30°C - 85°C / 0%RH - 100%RH Storage environment: -30°C - 60°C / 5%RH - 95%RH Dimensions: 45 x 11 x 105 (W x H x D) / 22g
Mounting Kit Screw set for mechanical mounting Applications and Use: Screw set for mechanical fastening
Mounting Plate E- 1U Rack (cabinet) mounting plate, 1U mounting for HW-group Ares and Poseidon2 devices Operating environment: -30°C - 85°C / 0%RH - 100%RH Storage environment: -30°C - 60°C / 5%RH - 95%RH Dimensions: 127 x 45 x 94 (W x H x D) / 137g Warranty: 24 months Rack (cabinet) mounting plate, 1U mounting for HW-group Ares, Poseidon2 3266/3268 and other products.
Mounting Plate L DIN Rail DIN rail mounting plate for Ares, Poseidon2 3268, and other products. Features: Metal housing Wall mounting Applications and Use: Profiles for metal-encapsulated HWg devices for wall mounting. Dimensions: 150 x 120 x 45 (W x H x D) / 65g Warranty: 24 months
Mounting Kit for Poseidon2 4002 and HWg-SMS-GW3 Applications and Use: Mounting kit for Poseidon2 4002 and HWg-SMS-GW3 Operating environment: -30°C - 85°C / 0%RH - 100%RH Storage environment: -30°C - 60°C / 5%RH - 95%RH Dimensions: 136 x 45 x 16 (W x H x D) / 165g Warranty: 24 months
Rack Shelf 1U A versatile solution for easy mounting of HW-group devices in 1U racks. Operating environment: -30°C - 85°C / 0%RH - 100%RH Storage environment: -30°C - 60°C / 5%RH - 95%RH Dimensions: 485 x 44 x 104 (W x H x D) / 597g Warranty: 24 months Housing: Metal Type: Wall mounting This shelf makes it easy to use devices in racks. You can even combine different 1U products and sensors.
Software
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
Marsweg 17
48163 Münster
Deutschland
Fon: +49 - 2501 - 9 78 58 80
Email: info@didactum-security.de
