Technical Service Center

Start from the accuracy you need and what the tags have to do, then pick the infrastructure behind them.

• Centimetre-level tracking of people or assets, zone by zone: UWB. Accuracy is 0.1-0.3 m, a cell covers about 50 m (300 m+ with the enhanced option), and the same tag switches seamlessly between 0D (room presence), 1D (tunnel or corridor), 2D (workshop floor) and 3D (multi-storey) without changing hardware. A 2D or 3D fix needs the tag to be heard by at least three base stations.
• Metre-level area presence at the lowest cost per tag and 3+ years of battery: 2.4 GHz area positioning (ZigBee-style). The tag has to reach at least three base stations; positions resolve within 1-3 m.
• One hall or one room covered by a single base station: Bluetooth AoA. One base station gives the angle of arrival, and because the tag height is known that is already a 2D position; add base stations for a large hall or for 3D.
• Only choke points matter (doors, gates, in-out events): the dual-frequency tag WE-T85K125 needs no positioning grid at all. A 125 kHz exciter at the doorway wakes the tag (up to 5 m away) and the exciter ID tells the platform which door was crossed.

Base station counts and mounting positions are worked out per site: send your engineer the floor plan, the ceiling height and the areas that must be kept apart, and the layout comes back as a drawing with the cable runs.

How the tags report

• UWB tags (WE-T206-H, WE-T241-C, WE-T311, WE-UG230) work on IEEE 802.15.4a or 802.15.4z, in TDoA and ToF modes, in the 3-9 GHz band. The asset tag WE-T311 uses high band CH5 (6.24-6.74 GHz) and CH9 (7.74-8.24 GHz), 500 MHz+ bandwidth, 6.8 Mbps, -41.3 dBm/MHz, which is what makes it usable worldwide without a licence.
• Single-area capacity: 240 Hz in ToF mode and 950 Hz in TDoA mode. Report rate per tag is a system setting from 0.1 to 20 Hz; the WE-T206-H refresh rate is adjustable across the same range.
• 2.4 GHz area positioning and Bluetooth AoA share the 2.4-2.4835 GHz band. One base station carries 500+ tags forward, and the reverse channel has no limit.
• The card tag WE-T241-C adds BLE 5.1 for auxiliary Bluetooth positioning plus a barometer and a three-axis accelerometer, and carries a LoRa module for long-range device communication.
• The dual-frequency WE-T85K125 stays silent until a 125 kHz exciter wakes it (OOK, Manchester-32 coding, 80 uVRMS sensitivity, up to 5 m), then transmits on 2.4 GHz (802.15.4, QPSK, not exceeding 3 mW, up to 80-100 m in open air). It can also send a periodic heartbeat, for example once a minute, so you still get a rough position when no exciter is nearby.

Backhaul and integration

• Base stations feed the positioning server over Ethernet data backhaul; the data transmission layer supports 4G as well.
• The server exposes UDP/TCP and an Open API, so positions can be pushed into your own system, and the positioning layer can be integrated with your video.

Most day-to-day changes are configuration, not firmware.

• Working mode (ToF / TDoA), positioning mode (0D / 1D / 2D / 3D), report rate (0.1-20 Hz), transmit power and smart hibernation are set from the platform or the API. UWB tags switch between the 0D, 1D, 2D and 3D modes seamlessly while they are running, so a layout change does not mean re-flashing a fleet.
• Tags report their own health: real-time battery level plus an under-voltage or low-battery alert. Check that list before planning an update window.

Firmware itself is delivered over the air where the model supports it.

• The UWB asset tag WE-T311 documents OTA upgrade and OTA configure.
• For a model whose datasheet does not list OTA, ask your engineer for the update method before planning a fleet rollout.
• Released firmware and SDK packages are published on the Software & Tools and SDK tabs of the Support download page. When a specific version has to be pinned for a live fleet, tell your engineer the model and the hardware revision.

Work through this list in order. In practice the first three cover most cases.

• Coverage: the tag must be heard by enough base stations. 2.4 GHz area positioning needs at least three base stations, otherwise the fix degrades to somewhere in this area; UWB 2D and 3D fixes have the same requirement. A UWB cell covers about 50 m (300 m+ with the enhanced option), and 2.4 GHz tags reach 80-100 m in open air - much less through walls, racking and machinery. Add a base station rather than raising transmit power.
• Battery: every tag family reports a low-battery or under-voltage alert. On UWB tags the LED says it directly - on the WE-T206-H, yellow flash means UWB is working, blue means charging, green means full, red flash means low battery; the asset tag WE-T311 flashes green in normal operation and red when the battery is low.
• A sleeping tag is not a lost tag: the WE-T26 stops transmitting after ten minutes without movement by default, and the dual-frequency WE-T85K125 stays silent until a 125 kHz exciter wakes it or its heartbeat fires. No position can simply mean no movement and no exciter nearby.
• Radio conflict: 2.4 GHz tags and AoA share the 2.4-2.4835 GHz band with Wi-Fi and BLE, so check the channel plan. UWB works in 3-9 GHz (CH5/CH9) and is not affected by Wi-Fi congestion.
• Environment: cross-check the rating of that model - IP43 with an optional IP68 version on the WE-T311, IP65 on the WE-T26, IP67 on the WE-T206-H and WE-T241-C, IP68 on the WE-T85K125. Working temperature is -20 to 60 degrees C on the WE-T311 and the WE-T26, and -20 to 70 degrees C on the WE-T85K125. Water ingress or condensation shows up as dropouts plus a battery that drains fast.

Still stuck? Note the tag ID, the time window and the base stations that last heard it, and send that to your engineer together with the model and the hardware revision.

Pick the model by how the tag is carried and what it has to do.

• People, worn on a wristband or a helmet, with an SOS key: WE-T206-H. UWB (IEEE 802.15.4a) in TDoA and ToF modes, IP67, rechargeable lithium battery, standby over one month, refresh rate 0.1-20 Hz.
• A card or badge worn on a lanyard or an armband, doubling as a door card: WE-T241-C. UWB in TDoA, ToF and AoA, BLE 5.1 plus barometer and three-axis accelerometer, RFID ISO 14443A 13.56 MHz for access control, SOS plus low-battery and prolonged-inactivity alerts with vibration and buzzer, LoRa for long-range communication, IP67 and explosion-proof (Ex iB IIC T6 Gb).
• Assets and materials, glued, screwed or zip-tied: WE-T311. UWB asset tag, up to 5 years on a disposable lithium battery, IP43 with an optional IP68 version, 60 x 25.5 x 11 mm and 15.3 g.
• Vehicles, turnover boxes and gate crossings where the crossing event is what matters, or where 2.4 GHz range is needed: WE-T85K125 dual-frequency (woken by a 125 kHz exciter, IP68, replaceable AAA cells) or the long-distance WE-T26 (up to 100 m, CR2450 coin cell, IP65).
• Proximity alerts between people, triggered when the distance between two tags drops below a threshold: WE-T206-Z.
• Positioning mounted on a vehicle: WE-UG230.

What to have ready when you order

• How many tags per model, and how each one is worn or mounted (wristband, helmet, lanyard, armband, adhesive, screws, tie).
• The accuracy you actually need: centimetre level means a UWB tag; metre-level area presence is enough with a 2.4 GHz tag.
• Battery preference: rechargeable (WE-T206-H) versus multi-year disposable (WE-T311, WE-T26, WE-T85K125).
• Whether the tag also has to work as an access card, and whether the area is explosion-proof rated.

Specifications and datasheets for every model are on the Documentation tab of this page, and base stations and gateways are quoted separately from the tags. Warranty period and RMA conditions are confirmed with the order - ask your engineer for the current terms for the model you are deploying.