Light 1Wire-UNI - Light sensor
€109.30
The Light Sensor for the 1-Wire UNI Interface
The HW group Light 1Wire-UNI is a simple light intensity sensor for indoor use. It is connected to Poseidon and Ares devices as well as other HW group products with a 1-Wire UNI bus (RJ11) and provides the light intensity as a value from 0 to 100 %.
Typical applications include distinguishing between day and night or detecting people in the server room: when someone switches the light on or off, the measured value changes. Each sensor has a unique serial number, so multiple sensors can be operated in parallel on a single RJ11 port.
Easily Monitor Light Changes
The Light 1Wire-UNI reports the illuminance in indoor areas and is powered via the RJ11 connection without additional wiring.
Measuring Range 0–100 %
Light intensity with an accuracy of ±10 % and a resolution of 1 %.
RJ11 Connection
1-Wire bus (Data, GND, +5 V) via RJ11 – fast and simple installation.
Unique Serial Number
Each sensor is individually identified; multiple sensors run in parallel on one port.
Powered via the Bus
5 V via RJ11 (1-Wire), current consumption 10 mA – no separate power supply is required.
3 m Cable
The cable allows flexible positioning on the wall or in the rack.
For Indoor Use
Protection class IP23 for industrial, SoHo, and IT environments.
How the Light 1Wire-UNI Sensor Is Constructed
The sensor consists of a slim probe with a semiconductor sensor element, a 3 m cable, and an RJ11 connector. The total weight is 58 g.
Probe with Semiconductor Sensor Element
The flat probe measures 78 x 9.5 x 6 mm. The semiconductor sensor element detects the illuminance and outputs it as a value from 0 to 100 %.
Mounting Hole Ø 3 mm
The probe is mounted on the wall or in the rack via the 3 mm diameter hole.
Cable (3 m)
The 3 m cable connects the probe to the device and enables flexible positioning.
RJ11 Connector (1-Wire UNI)
The connector carries the 1-Wire bus with Data, GND, and +5 V. Pin assignment on the RJ11: Pin 2 = Data (1-Wire), Pin 3 = GND (system ground), Pin 4 = +5 V (power supply). On an RJ12 connection, these correspond to pins 3, 4, and 5.
Unique Serial Number
Each sensor has its own serial number by which the device recognizes it. This allows multiple sensors to be operated in parallel on a single RJ11 port.
Mounting and Operating Conditions
The sensor is intended for wall or rack mounting in indoor areas.
- Mounting via the mounting hole (Ø 3 mm)
- Mounting on the wall or in the rack, indoor use only
- Operating environment: −30 °C to +85 °C, 0–100 % RH
- Storage environment: −30 °C to +60 °C, 5–95 % RH
- Protection class IP23
- Use in industrial, SoHo, and IT environments
- Powered with 5 V via the RJ11 connection, current consumption 10 mA
- No galvanic isolation
Multiple Sensors on One Bus
The Light 1Wire-UNI can be used in various topologies on the 1-Wire bus. The total length is up to 60 m per active port in each case.
- Star topology: 60 m total, e.g. Ares 12 with a T-Box RJ11 splitter and multiple sensors
- Daisy-chain: 60 m total, for sensors with two RJ11 connectors
- 4 active ports: 4 x 60 m, e.g. Poseidon 4002 with T-Box2 as RJ11 splitter
- Poseidon T-Box2: splitter for two RJ11 sensors
- Poseidon T-Box RJ11: hub for connecting sensors via the 1-Wire bus to Poseidon2 and Ares 10/12
- Multiple Light sensors in parallel on one RJ11 port, distinguished by serial number
Connection to Poseidon2, Ares, STE2, and Perseus
The sensor is connected via the 1-Wire UNI interface (RJ11) to compatible HW group devices.
- Poseidon2 3268, 3468, and 4002
- Ares 12 LTE and HWg-Ares 12
- STE2 PLUS, STE2 PLUS SMS-GW, STE2 LITE, and STE2 R2
- Perseus Monitoring 140, 145, 150, and 155
- Perseus Energy 242 and 285
- NB-2x1Wire for IoT monitoring
- On Poseidon devices, the illuminance is available e.g. via SNMP or Modbus/TCP
- Email notification on light change, e.g. when entering or leaving a room
Commissioning in a Few Steps
- Mount the probe at the desired location (mounting hole Ø 3 mm)
- Plug the RJ11 connector into a 1-Wire UNI port of the Poseidon, Ares, or other HW group device
- Optional: connect additional sensors in parallel, e.g. via a T-Box splitter
- Evaluate the measured value on the device; on Poseidon devices e.g. via SNMP or Modbus/TCP
- Optional: set up email notification on light change, e.g. when entering or leaving a room
Why the Light 1Wire-UNI Sensor Is the Right Choice
Simple Installation
RJ11 connection and 3 m cable for fast, flexible setup.
Parallel Operation
Multiple sensors on one RJ11 port thanks to unique serial numbers.
Compact
Slim probe with a total weight of only 58 g.
Low Current Consumption
Only 10 mA, powered via the 1-Wire bus.
Wide Temperature Range
Operation from −30 °C to +85 °C.
24-Month Warranty
According to the manufacturer from the date of purchase.
Typical Areas of Use
- Server room: email as soon as someone enters the room (light on) or leaves (light off)
- Access detection on cabinets or rooms
- Indicative monitoring of the illumination of photovoltaic panels with Ares
- Distinguishing day and night in indoor areas
- Monitoring of mobile radio base stations (BTS)
- Simple light intensity measurement in industrial, SoHo, and IT environments
Frequently Asked Questions
What is the Light 1Wire-UNI and what is it used for?
The HW group Light 1Wire-UNI is a simple light intensity sensor for indoor use. It is connected to Poseidon, Ares, and other HW group devices with a 1-Wire UNI bus (RJ11), for example to distinguish day and night or to detect the presence of people in the server room via the light.
Are there options or variants?
No, the Light 1Wire-UNI is offered without variants.
What measuring range and accuracy does the sensor have?
The sensor outputs the light intensity as a value from 0 to 100 %, with an accuracy of ±10 % and a resolution of 1 %.
Does the sensor need its own power supply?
No. The sensor is powered with 5 V via the RJ11 connection (1-Wire bus) and draws 10 mA.
How many sensors can be operated on one port?
Multiple sensors can be operated in parallel on a single RJ11 port, as each sensor has a unique serial number. Additional sensors can be connected via splitters such as the Poseidon T-Box2.
How long may the cable on the 1-Wire bus be?
In the manufacturer’s cabling examples, the total length is 60 m per active port, for both star and daisy-chain topologies. With four active ports, 4 x 60 m is possible.
Which devices are compatible?
Compatible devices include Poseidon2 (3268, 3468, 4002), Ares (Ares 12 LTE, HWg-Ares 12), STE2 (PLUS, PLUS SMS-GW, LITE, R2), Perseus Monitoring and Energy, as well as NB-2x1Wire.
Questions about the Light 1Wire-UNI Sensor?
Our support team in Germany provides free advice on selection, sensors, and configuration.
Technical Parameters:
- Output signal: 0 – 100%
- Operating temperature: -40°C to +85°C (-40°F to +185°F)
- Sensor dimensions: 78 × 9.5 × 6 mm
- Cable length: 3 m
- Mounting hole: Ø3 mm
- Application: Indoor use
- Unique serial number for each sensor
Interfaces:
- 1-Wire UNI bus communication
- RJ11 connector
- Signals: Data, GND, +5V
- Multiple sensors can be connected in parallel to one port
- Compatible with Poseidon, Ares and other HW group products
Wiring:
- RJ11 to RJ12 pinout mapping:
- Pin 2 (RJ11) ↔ Pin 3 (RJ12): Data (1-Wire)
- Pin 3 (RJ11) ↔ Pin 4 (RJ12): GND (System Ground)
- Pin 4 (RJ11) ↔ Pin 5 (RJ12): +5V (Power Supply)
Topology Options:
- Star topology: 60 m total
- Daisy-chain topology: 60 m total
- 4x active ports: 4×60 m possible
- Two RJ11 connectors on some sensors
Applications:
- Day/Night distinction
- Presence detection in server rooms (light switched on)
- Simple light intensity measurement in indoor environments
Monitoring devices
Other available sensors
Extension units
Accessories
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.
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
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 Screw set for mechanical mounting Applications and Use: Screw set for mechanical fastening
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 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
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
Im Mühlenfeld 4
48163 Münster
Deutschland
Fon:
(+49) 250 19 71 63 54 / (+49) 171 33 11 577
Email: info@didactum-security.de
