An RFID tag and scanner work together to identify, track and manage products or assets using radio-frequency communication. Unlike traditional barcode systems, RFID technology does not always require direct line of sight and can read multiple tags within a short period.
This makes RFID suitable for inventory management, logistics, manufacturing, retail, laundry management and fixed asset tracking.
But how does an RFID tag communicate with a scanner, and which hardware should businesses select? This article explains the working principle, equipment types and common applications.
1.What Is an RFID Tag?
An RFID tag is an electronic identification device attached to a product, carton, pallet, tool or other asset.
A typical RFID tag consists of two primary components:
- RFID chip: Stores identification and memory data.
- RFID antenna: Receives radio-frequency energy and sends information back to the reader.
Depending on the application, the chip may store EPC, TID and user memory data.
RFID tags are available in many formats, including:
- Dry RFID inlays
- Wet RFID inlays
- Printable RFID labels
- RFID on-metal tags
- RFID laundry tags
- Industrial RFID tags
- RFID cards
- RFID wristbands
- RFID ear tags
- RFID seal tags
The correct tag depends on the operating frequency, tagged material, required reading distance and environmental conditions.
2.What Is an RFID Scanner?
An RFID scanner, also called an RFID reader, is a device that communicates with RFID tags using radio waves.
The scanner transmits an RF signal through its antenna. When a compatible tag enters the reading field, it receives the signal and responds with its stored information.
RFID scanners are available in several forms:
Handheld RFID Scanner
A handheld RFID scanner combines RFID reading with mobile data collection. It allows employees to move through warehouses, stores and production facilities while scanning tagged items.
It is commonly used for:
- Inventory counting
- Product searching
- Asset inspection
- Warehouse receiving
- Order picking
- Retail stock management
Fixed RFID Scanner
A fixed scanner is installed at a specific location, such as a warehouse entrance, production line, loading area or access point.
It can automatically record tagged items as they pass through the reading zone.
Integrated RFID Reader
An integrated RFID reader combines the reader module and antenna in one enclosure. It can simplify installation and reduce the number of external components required.
Desktop RFID Reader
A desktop reader usually provides a shorter reading distance and is suitable for tag encoding, registration and small-scale identification.
3.How Does an RFID Tag and Scanner Work?
The communication process between an RFID tag and scanner generally includes five steps:
- The scanner generates a radio-frequency signal.
- The reader antenna transmits the signal into the surrounding area.
- A compatible RFID tag receives the signal.
- The tag sends its stored identification information back to the scanner.
- The scanner transfers the data to a computer, ERP, WMS or inventory management platform.
Passive RFID tags do not contain an internal battery. Instead, they obtain energy from the RF field generated by the scanner.
Active RFID tags contain their own battery and can support longer communication distances, but they are generally larger and more expensive.
RFID Frequencies
An RFID tag and scanner must support the same frequency and communication standard.
Low-Frequency RFID
Low-frequency RFID typically operates around 125–134 kHz. It usually provides a short reading distance and is used for animal identification, access control and industrial identification.
High-Frequency RFID
High-frequency RFID operates at 13.56 MHz and includes NFC technology.
Common applications include:
- Library management
- Access cards
- NFC product interaction
- Document identification
- Contactless applications
UHF RFID
UHF RFID generally operates between 860 and 960 MHz, depending on regional regulations.
UHF technology offers longer reading distances and can identify multiple tags rapidly. It is widely used in:
- Warehouse inventory
- Logistics
- Apparel retail
- Manufacturing
- Asset management
- Pallet and carton tracking
For large-scale inventory applications, a UHF RFID tag and scanner combination is often the preferred option.
RFID Handheld Reader
4.RFID Tag and Scanner vs. Barcode
RFID and barcode technologies are both used for identification, but their operating methods are different.
| Feature | RFID Tag and Scanner | Barcode and Scanner |
| Line of sight | Usually not required | Required |
| Multiple-item reading | Supported | Usually one at a time |
| Reading distance | From centimeters to several meters | Usually short range |
| Data storage | Depends on RFID chip | Limited to printed code |
| Reusability | Many tags can be rewritten | Printed barcode cannot be rewritten |
| Performance near metal or liquid | Requires a suitable RFID tag | Generally less affected |
RFID does not replace barcodes in every application. Businesses should select the technology based on their operating environment, automation requirements and budget.
5.Common Applications
Inventory Management
Employees can use handheld RFID scanners to count tagged products without scanning every item individually. This can reduce manual work and improve inventory visibility.
Warehouse and Logistics
Fixed RFID readers can be installed at warehouse doors and loading areas to identify cartons or pallets moving through key locations.
Retail and Apparel
RFID labels provide item-level identification for clothing, footwear and other retail products. Store employees can use handheld scanners to conduct stock counts and locate specific items.
Manufacturing
RFID tags can identify raw materials, components and work-in-progress products. Readers installed along production lines can collect movement and status information.
Fixed Asset Tracking
RFID tags can be attached to tools, IT equipment, machinery and office assets. Handheld scanners help employees perform regular inspections and asset counts.
Laundry Management
Washable RFID tags can identify uniforms, towels, linens and garments throughout washing, sorting and distribution processes.
6.How to Choose an RFID Tag and Scanner
Before selecting RFID hardware, consider the following questions:
- What objects need to be tracked?
- Is the surface metal, plastic, glass, cardboard or fabric?
- What reading distance is required?
- How many tags must be read simultaneously?
- Will the hardware be used indoors or outdoors?
- Does the tag need to resist water, chemicals or high temperatures?
- Is a handheld or fixed scanner more suitable?
- Which RFID frequency is permitted in the target country?
- What communication interfaces are required?
- Does the hardware need to connect with an ERP or WMS?
RFID performance is influenced by tag position, antenna orientation, surrounding materials and reader configuration. Testing samples in the actual operating environment is recommended before mass production.
RFID Hardware Integration
RFID scanners collect tag information, while software manages and analyzes the data.
Depending on the reader model, common interfaces may include:
- Ethernet
- Wi-Fi
- Bluetooth
- USB
- RS232 or RS485
- GPIO
- API or SDK integration
System integrators can use the SDK, API and communication protocol supplied with the hardware to connect RFID readers to inventory systems, warehouse platforms and customized applications.
7.Frequently Asked Questions
Can One RFID Scanner Read Different Tags?
Yes, but the tags must be compatible with the scanner’s frequency and communication standard. A UHF reader cannot normally read HF or NFC tags.
Can RFID Tags Be Read Through Boxes?
In many cases, UHF RFID tags can be read through cardboard or plastic packaging. However, metal and liquid may interfere with RF performance.
How Far Can an RFID Scanner Read?
Reading distance depends on the tag, reader power, antenna gain, frequency and operating environment. Passive tags may provide reading distances ranging from a few centimeters to several meters.
Can an RFID Scanner Read Multiple Tags at Once?
Yes. UHF RFID readers can identify multiple compatible tags within their reading field, making them suitable for rapid inventory counting.
8.Conclusion
An RFID tag and scanner form the foundation of an RFID identification system. The tag stores identification data, while the scanner captures and transfers that information to the connected management platform.
Choosing suitable hardware requires careful consideration of frequency, reading distance, installation surface, environment and integration requirements.
SEIKO RFID TECHNOLOGY LTD. supplies RFID hardware for inventory management, logistics, manufacturing, retail, laundry and asset tracking. Our products include RFID tags and inlays, on-metal tags, industrial tags, handheld scanners, fixed readers, antennas and RFID gate equipment.
We focus on hardware supply and provide SDKs, APIs and communication protocols for system integration and secondary development.
Contact us with your application, required reading distance, installation surface and estimated quantity for a suitable RFID tag and scanner recommendation.