REFLECTA™ U-SENSE In-Rack Sensing

Tags, U-Rack Strips and Rack Controller – every U sensed, every 2 seconds

Rack Controller 1U server, in place1U switch, in place2U storage, in placeReserved spanEmptySwap pending U-Rack Strip (left), U-SENSE tags (white squares)

See it in VigiStock →

Sensing hardware for VigiStock data centre tracking

REFLECTA™ U-SENSE is the in-rack sensing layer of the VigiStock platform. Three parts: a passive U-SENSE tag on each device, a six-cell U-Rack Strip inside the rack with one sensing cell per U-position, and one Rack Controller per rack that chains the strips and streams presence, door and health telemetry to the VigiStock server over an encrypted, authenticated link. Together they tell VigiStock which device is in which U of which rack, right now, without anyone walking the aisle.

Key Features

  • Per-U sensing – One sensing cell per U-position reads only the tag directly in front of it. No cross-reads between adjacent devices.
  • Battery-free tags – Passive U-SENSE tags with no electronics to power. Nothing to charge or replace for the life of the device.
  • 2-second sweep – Arrival, departure and swap reported within one sweep; departure confirmed after three missed sweeps.
  • Door and health sensing – Rack Door state, per-strip link state and per-cell health in every report. A dead sensing cell is a fault, never an empty slot.
  • LED guidance – Each U lit from the plan and the measurement: green in place, purple reserved, orange swapped, fast red missing. Keeps working if the network drops.
  • Secure transport – Encrypted end to end from rack to server, every controller authenticated by its own device identity, every message tamper-evident. Protocol details under NDA.
  • Dual-tag ready – Pair with a REFLECTA UHF RFID tag on the same device for dock and gate reads. One asset record resolves from either tag.

Specifications

U-SENSE Tag
TechnologyProprietary passive per-U sensing (REFLECTA U-SENSE)
PowerNone (battery-free)
IdentifierUnique UID, also printed as QR for one-scan registration
MountingAdhesive, device front face or mounting ear, in front of the strip sensing cell
Read rangeShort range by design, single U discrimination
U-Rack Strip
Sensing cells6, one per U-position
Coverage6 U per strip; 7 strips for a 42U rack
ConnectionDaisy-chain to Rack Controller; not a network device
MountingInside rack along front rail line, outside airflow path, no drilling
ReportingPer-cell read-quality score 0 to 100, cell health, link state
Rack Controller
Per rack1 controller, up to 8 strips (48 U)
NetworkOne network connection per rack; proprietary encrypted, authenticated link to the VigiStock server
Sweep2 s default; heartbeat 5 min; departure after 3 missed sweeps; configurable
InputsRack Door sensor, strip chain
OutputsPer-U LED plan, Verify Now response, telemetry, health
IdentityPer-controller device identity; tamper-evident messaging

A 42U rack kit: 1 Rack Controller, 7 U-Rack Strips, U-SENSE tags per device. Racks above 48U and environmental smart tags are scoped per site.

Where it sits in the VigiStock platform

VigiStock is one platform with six technology layers; U-SENSE is layer 5. Layers 1 to 4 (register and evidence, QR, UHF handheld, UHF gate readers) work without it, and racks without strips show on the same views with their last verified state. Add strips rack by rack. The full picture, with screenshots of Rack Elevation, Room Layout and the asset trace, is on the U-SENSE in-rack sensing page; the requirements guide and compliance mapping are on Data Centre Asset Tracking.

Frequently Asked Questions

How does a U-SENSE tag work?

A U-SENSE tag is a passive, battery-free sensing tag read only by the U-Rack Strip cell directly in front of it. That deliberately short reach is the point: it tells the strip exactly which U a device occupies, with no cross-reads from the slot above or below. For long-range reads at docks and gates the same device carries a REFLECTA UHF RFID tag.

How many U-Rack Strips does a 42U rack need?

Seven strips of six sensing cells cover 42 U. One Rack Controller supports up to eight strips (48 U), so a 42U rack needs one controller and seven strips. Strips daisy-chain, and the Reader Registry stores which strip maps to which U-range so wiring order does not have to match physical order.

Does the strip block airflow or need rack modification?

The strip mounts inside the rack along the front rail line, outside the equipment airflow path, and needs no drilling of the rack or the devices. The tag sits on the device's front face or mounting ear.

What does the Rack Controller need from the facility network?

One network connection per rack to reach the VigiStock server. The link is encrypted, each controller authenticates with its own device identity, and a controller that drops off the network is marked offline within seconds. Ports, protocols and certificate handling are documented for your network team under NDA during the project security review.