Optical motion sensor VS121

non-contacthigh-precisionwireless

Overview
VS121 is an AI workplace occupancy sensor available in LoRaWAN® and PoE versions. It delivers GDPR-compliant, anonymous presence detection and people-counting insights to optimize space utilization across meeting rooms, open offices and other workplace environments.

Key Benefits

• Accurate occupancy detection (up to 95% reliable accuracy)
• 100% anonymous detection to support privacy and GDPR compliance
• Large coverage up to 127.84 m² with up to 16 customizable regions
• Multiple deployment options (LoRaWAN® wireless or PoE wired)

Main Features

• AI-powered detection with advanced filtering of redundant counts (U-turn filtering)
• Regional people counting and dwell time detection (up to 16 areas; up to 10 sides per area)
• Bidirectional people counting and flexible line-drawing for flow/traffic analysis
• People flow analysis (calculate traffic of different directions, up to 4 edges)
• Privacy masks: up to 8 privacy masks to cover sensitive areas
• Data retransmission support: up to 3000 retransmission packets for reliability
• Multiple product versions to support different mount heights and environments

Transmission & Integration
LoRaWAN® transmission with Milesight D2D support; OTAA/ABP (Class C). Supported frequency bands include CN470 / IN865 / RU864 / EU868 / US915 / AU915 / KR920 / AS923 variants.

PoE & Ethernet Integration
PoE (802.3af) capable model for Ethernet transmission and richer integration. Network protocols supported include HTTP, RTSP, NTP, SSH, BACnet/IP and others for building integration.

Other Interfaces & Configuration

• Wi‑Fi: AP mode for initial configuration
• PoE model: 1 × RJ45 10/100 Mbps (PoE PD) with Ethernet isolation
• DI/DO and RS485 (PoE model: RS485 under development) for extended integration
• Buttons: Reset and Wi‑Fi (LoRaWAN version) / Reset (PoE model)

Privacy & Compliance
Designed with privacy-first principles: anonymous people detection (no personal data captured), GDPR product certified and suitable for privacy-conscious deployments in offices and shared spaces.

Use Cases

• Meeting room occupancy optimization: real-time presence, dwell-time and ghost booking reduction
• Open office utilization: zone-based counting and traffic analytics to optimize desk layouts
• Workplace planning: long-term occupancy trends for capacity planning and redesign
• Occupancy-driven building automation: trigger HVAC, lighting and ventilation via LoRaWAN®, Ethernet or device-to-device rules

Technical specifications

• Model / Denomination: VS121
• People counting field of view: 190° horizontal, 112° vertical
• Recommended installation height: 2.3 m to 4 m
• Regional counting & dwell time: up to 16 areas (up to 10 sides per area)
• Bidirectional people counting: supported
• U-turn filtering: supported (reduces redundant counts)
• People flow analysis: traffic directions calculation (up to 4 edges)
• Privacy masks: up to 8 privacy masks
• Data retransmission: supports up to 3000 retransmission packets
• LoRaWAN® protocol: LoRaWAN®, Milesight D2D; OTAA / ABP (Class C)
• LoRaWAN® frequencies: CN470 / IN865 / RU864 / EU868 / US915 / AU915 / KR920 / AS923 variants
• LoRaWAN® TX power & sensitivity: TX up to 20 dBm (varies by band); sensitivity example -137 dBm @300bps
• Ethernet (PoE model): 1 × RJ45 10/100 Mbps (PoE PD), Ethernet isolation 1.5 kV RMS
• Network protocols (PoE model): HTTP, RTSP, NTP, SSH, BACnet/IP, etc.
• Wi‑Fi: IEEE 802.11 b/g/n 2.4 GHz (AP mode for configuration)
• DI/DO: (PoE model) 1 DI / 1 DO
• Serial interface: (PoE model) 1 × RS485 (under development)
• Buttons & LEDs: Reset button; Wi‑Fi button (LoRaWAN version); status LED(s)
• Power supply (LoRaWAN version): 5 V DC via Type‑C (5V/2A) | (PoE model): 802.3af PoE or 3.5 mm terminal block option
• Power consumption: LoRaWAN version ~3.5 W; PoE ~4.5 W (typical)
• Operating temperature: -5 °C to +55 °C
• Storage temperature: -20 °C to +60 °C
• Relative humidity: 0 ~ 95% non‑condensing
• Ingress protection: IP30
• Housing: PC + cast aluminium
• Color & weight: White (LoRaWAN ~126.9 g); PoE version white ~186 g
• Dimensions: LoRaWAN 85 × 85 × 20 mm; PoE 85 × 85 × 30 mm
• Installation: ceiling mounting
• Approvals: CE, FCC, GDPR; Environmental: RoHS