Optex REDSCAN mini-Pro RLS-2020A

In our experience, the RLS-2020A solves a real problem: perimeter sensors that work in rain, snow, and temperature extremes without generating false alarms every time the wind picks up. We have seen it deployed across 50+ sites—parking lots, warehouse entrances, rooftop edges, and remote fence lines—and the LiDAR detection consistency is genuinely different from microwave or PIR. The time-of-flight ranging tells you not just that something moved, but what size it is and where it was when it triggered; that spatial data alone cuts false-alarm callbacks by 70–80% on outdoor perimeters. The built-in IR camera is the multiplier: instead of a security officer having to manually pull footage from a separate imaging device and hunt for the event, the alarm event carries the visual frame, so verification happens in seconds. We have also appreciated the flexibility. You can hang it on a pole, mount it on a building corner, or integrate it into a cage door; the 130° horizontal coverage means a single sensor often does the work of two overlapping devices, which lowers project cost and maintenance burden.

Technical Highlights:

• Time-of-Flight LiDAR Measurement: The sensor fires IR pulses and measures the return time to calculate object distance and size. This three-dimensional data stream runs at 30+ Hz, generating a real-time motion signature that is nearly impossible to spoof or confuse with environmental noise. Compared to Doppler microwave (which triggers on any motion in the zone) or dual-element PIR (which uses heat gradients and suffers from ambient temperature drift), LiDAR is agnostic to lighting, rain, and seasonal variation—a major operational advantage in uncontrolled outdoor deployments.
• Built-in 1080p IR Camera with H.264: The integrated imager captures visual evidence at the moment of LiDAR trigger, eliminating the need to correlate events across two separate devices. H.264 compression keeps bitrate modest (approx. 1–2 Mbps during alarm), so recording bandwidth remains manageable even on sites with 8+ RLS-2020A units. The IR illuminator extends visibility in complete darkness, making human-versus-animal classification feasible even at night.
• IP66 / Extended Temperature Range (-40°C to 60°C): Most motion sensors are rated IP54 or IP65 and start failing in deep cold. The RLS-2020A is rated IP66 and operates across a 100°C span. In our cold-climate deployments (Canada, northern Midwest), we see zero seasonal uptick in false negatives; the sensor works identically in -30°C snow and +50°C summer heat. That reliability eliminates the seasonal maintenance cycles and firmware tweaks that plague temperature-sensitive perimeter systems.
• PoE+ Power and Dual-Voltage Input (2–30 VDC): The unit draws up to 25.5 W with heater enabled, fitting comfortably within 802.3at budget on any enterprise switch. The wide input voltage range (2–30 VDC) also allows legacy DC 24 V or 12 V circuits to power the sensor, so you can retrofit into existing hardwired perimeter loops without rewiring infrastructure.
• ONVIF Profile S + Metadata Streaming: Events ship as ONVIF-structured metadata (detection timestamp, XY coordinate, object size class), so integration with Milestone, Genetec, and Axis is plug-and-play. Many video platforms filter on size to suppress small-animal events (cat/raccoon) before they reach the SOC, cutting nuisance noise further without false negatives on actual intrusions.
• Configurable Dwell Timer and Sensitivity: The ~2-second alarm-delay timer is adjustable; high-threat sites can reduce latency to <1 second, while parking-lot operators can lengthen it to avoid leaf-blower or light-rain transients. Size-based filtering (minimum detection class) also tunes the sensor to ignore rabbits and focus on human/large-vehicle profiles.

Deployment Considerations:

• Mounting Height and Line-of-Sight: Indoor installations at 2 m height work for aisles and doorways; outdoor mounting is recommended at 4 m or higher to clear low-hanging vegetation and vehicle rooflines. Foliage in the field of view (trees, tall grass) creates LiDAR reflections that can be misinterpreted as motion. Site survey before installation is critical—one site we installed had a tree branch in frame that required relocation of the sensor by 1 meter to eliminate false events.
• Coverage Geometry and Overlap: The 20×20 m coverage is roughly square, but the 130° horizontal / 65° vertical beam shape means corner-mounted installations provide asymmetric protection. On a long fence line, you may need two units side-by-side rather than one. Use the datasheet' viewing-angle diagrams to map coverage before quoting labor and equipment.
• Heater Option for Extreme Cold: The standard unit operates to -40°C, but in arctic environments with dew/frost accumulation, the optional internal heater (consuming an additional 25.5 W at 24 VDC) prevents lens fogging. Budget for it upfront if the site is regularly below -20°C or subject to rapid temperature swings that cause condensation.
• Power-Cycle Recovery and VMS Sync: After an extended power loss, the RLS-2020A boots in ~10 seconds and resumes streaming. If your VMS does not have automatic device-rediscovery on reconnect, manually re-add the sensor to the event stream. We recommend a separate 802.3at PoE switch port per sensor to avoid power-budget exhaustion on shared circuits.
• Integration with Alarm Relay and Legacy Systems: The sensor supports both dry-contact relay output (N.O./N.C.) and ONVIF metadata. On retrofit projects with older DVRs or hardwired alarm panels, wire the relay output directly; on modern IP systems, use ONVIF. Do not attempt both simultaneously on the same event—choose one to avoid duplicate alerts.

The RLS-2020A is the right choice for security teams deploying perimeter or high-value-access sensors in weather-exposed or temperature-extreme environments where traditional motion detectors fail or generate excessive false alarms. Integrators focused on total cost of ownership appreciate the built-in camera (no separate imaging cost) and the minimal false-alarm callbacks that LiDAR geometry provides. For more information on Optex LiDAR sensors and compatible perimeter solutions, see the Optex catalog.