What is RFID reading?
RFID reads the labels that the reading and writing device identifies outside the target area of operations.
Cross-reading is common at RFID security gates, portals, smart cabinets, warehouse entrances, and fixed reading stations. The device reads a tag that really exists, but that tag should not take part in the current business event, so the core of the problem is that reads go beyond the business boundary.
The system can hardly distinguish between target labels and adjacent labels without clear operational boundaries, even if the equipment returns with accurate data.
Why does RFID read?
- RFID Reader power set too high to cover the target area
- An antenna beam, angle or installation height to form an over-sized reading range
- The metal wall, shelf and equipment produced a reflection to create an unintended cover
- The number of labels in the vicinity of the target area is high, and some labels are continuously exposed to the radio frequency field
- Antenna and equipment installation position close to the adjacent cargo position, passage or container
Threading is not usually caused by a single parameter. The same power may be performed in open areas, metal warehouses and closed cabinets in a completely different way, and will need to be judged in relation to antenna direction, site structure and label location.
Label sensitivity and placement orientation also affect which labels are more responsive. Some labels outside the target area may be read earlier than hidden labels in the area because they are more favourable.
Why not read as far away as possible?
The goal of the RFID project is not to obtain the maximum reading distance, but to identify the target label within the right area, while keeping the non-target area label as unreadable as much as possible.
Effective reading should be defined by business processes. For example, the warehouse entrance needs to identify goods passing through the corridor, the smart cabinet needs to recognize changes in the contents of the cabinet, and the self-help self-checkout area should handle only goods on the current clearing table.
The product's nominal distance can only be used for the initial selection, and the stabilization of the area of operation needs to be validated on-site.How far does RFID Tag usually read? What factors influence it?。
How do we control the RFID reading area?
- Access to regional and non-target areas using operational boundaries as benchmark marker targets
- Gradual adjustment of output power to observe changes in coverage and stability
- Optimizing antenna type, angle, polarization direction and installation height
- Repositioning of equipment to and from adjacent cargo positions, corridors or containers
- Reduction of non-target transmission through suction, shielding or cabinet structure, as necessary
- Repeat the test to read the boundary using the target label while the adjacent label is used
The shielding measures need to be combined with security, structure, maintenance and wireless environmental assessments, and metal plates cannot be used to simply surround all equipment.
The full test project is available.What should the RFID project field test test be?。
How does software help avoid serial reading?
Hardware controls are used to create the appropriate radio frequency areas as far as possible, while software rules are used to convert read events into business results. The two require work together, and cannot rely on a single filter condition to mask clearly unreasonable antenna coverage.
| Rule | Role | Attention |
|---|---|---|
| White list. | Only handle labels for current documents or to the extent permitted | Need to ensure that labels are accurate with business objects |
| Business status judgement | Decision whether to proceed based on the status of the repository, settlement or authorization | The delay in the status sync could result in a miscarriage of justice. |
| Time Window | Combine reading within a specified time to an event | The result is influenced by the length or short of the window |
| Regional rules | Use the antenna, dot or sensor to determine the area where the label is to be used | Need to finish the position marking first |
| Organisation | Filter reading instantaneously, repeatedly or without fulfilment | Original traceable records should be maintained |
If filter rules are not set properly, valid labels may also be excluded and shown as missing.Why is the RFID missing? The common reason and the way it was checked.。
What RFID scenes do you need to control a serial reading?
| scene | Target area | Typical Thread Risk |
|---|---|---|
| RFID security gate | Passage area within the gate or channel | Read static items inside and outside the door and trigger false reports |
| Smart cabinet | Inside the cabinet | Read extra- and adjacent-clause labels |
| Warehouse entrance and exit | Specified channel and working time window | Read goods in a nearby position or in a waiting area |
| Self-Checkout | Current clearing or identification warehouse | Read next to the customer or the show area |
These scenarios are usually close to the adjacent labels and require clear attribution of operational events, and should therefore be accompanied by the design of radio frequency coverage, trigger conditions, business white lists and unusual review modalities.
FAQs
Is RFID not a bad device for a serial reading?
Not necessarily. Threading often indicates that the equipment can read labels, but reading areas, antenna orientation, power or business rules do not match the target boundary and need to be restructured in conjunction with the field.
Can RFID read range be precisely controlled?
The area of reading can be reduced and stabilized by power, antennas, installation positions, shielding structures and software rules, but the radio frequency environment is affected by reflection and object variations and cannot be understood as a fully fixed geometric line.
Why is cross-reading common at security gates?
A security gate is usually close to tags on goods, assets, or waiting areas inside and outside the door, and the surrounding passage may contain metal structures and reflections. If antenna coverage or the event trigger range is too large, it easily reads tags that never actually passed through the gate.
The lower the RFID power, the better?
No. Too low power may cause the target area to miss, too high it may expand the read-through range. The target area should be identified as stable and non-target areas should be gradually adjusted to the extent possible without reading.