Cykeo RFID IoT Solution Products R&D Manufacturer
How to Read RFID with Android: Your Phone is Not a Magic Scanner
130A practical guide on how to read RFID with Android. Learn why your phone's NFC fails for most tags and the steps to connect an external UHF reader for real scanning apps.
MoreCan all RFID tags be rewritten or reprogrammed?
No—rewritability depends entirely on the tag’s memory architecture. RFID tags fall into three categories:
- Read-Only (RO): Factory-programmed, immutable UIDs (common in anti-counterfeiting)
- Write-Once-Read-Many (WORM): Allows one-time encoding after manufacturing
- Read/Write (RW): Fully rewritable, supporting thousands of update cycles
Over 68% of industrial RFID tags sold today are RW-type for lifecycle tracking.
1. How RFID Rewriting Works: Technical Process
Memory Structure
Rewritable tags partition memory into:
- Reserved Bank: Lockable permanent UID
- EPC Bank: Stores rewritable product data (e.g., stock numbers)
- User Memory: Custom data storage (updates 10k–100k times)
Reprogramming Workflow
- Reader Authentication: Authorized device verifies access password
- Data Erasure: Overwrites existing EPC/User Memory blocks
- New Data Encoding: Writes updated info in hexadecimal/ASCII
- Lock Settings: Optional permanent lockdown of memory sectors
Key limitation: UIDs in Reserved Banks are rarely rewritable—physical replacement needed for ID changes.
2. Top Applications for Rewritable RFID
| Industry | Use Case | Data Rewritten |
|---|---|---|
| Retail | Dynamic pricing | Promotions, discounts |
| Manufacturing | Work-in-progress | Quality test results |
| Logistics | Reusable pallets | Route history, handler ID |
| Healthcare | Patient records | Medication schedules |
Cykeo’s RW tags cut hospital asset-tagging costs by 92% vs. single-use tags.
3. Security & Compatibility Considerations
Risks
- Unauthorized Rewriting: Password-protect writers to prevent data tampering
- Write Fatigue: EEPROM memory degrades after ~100,000 cycles
- Frequency Mismatch: Ensure reader supports tag’s RF band (e.g., 902-928 MHz UHF)
Best Practices
- AES-128 encrypt write commands
- Use “kill” commands to deactivate retired tags
- Audit rewrite history via cloud logs
4. Rewritable vs. Non-Rewritable Tags
| Feature | Rewritable RFID | Non-Rewritable RFID |
|---|---|---|
| Memory Type | EEPROM/FRAM | ROM/PROM |
| Cost | Higher upfront (0.20–1) | Lower (0.05–0.20) |
| Lifespan | 5–10 years | Single-use or permanent |
| Environmental Durability | ✓ Withstands rewrites in harsh settings | ✘ Often disposable |
5. Step-by-Step Reprogramming Guide
- Tag Selection: Choose high-endurance tags (e.g., FRAM-based)
- Software Setup: Connect writer to Cykeo TagSync software
- Access Control: Enter encryption password
- Field Rewriting:
- Select target memory bank (EPC/User)
- Enter new data (text/hex values)
- Apply cyclic redundancy check (CRC)
- Verification: Scan tag to confirm updates
6. Future Innovations
- Quantum-Tunneling Chips: Rewrite 1M+ times without degradation
- DNA Storage Tags: Microbial data encoding for ultra-high capacity
- Cykeo’s Project Phoenix: Self-destructing tags via voltage overload
Relevance
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Sensor Data Without Batteries: When Your RFID Antenna Needs Two Jobs
249Standard RFID tags struggle with sensors. Learn how a dual-feed antenna for passive UHF RFID tag-based sensor applications ensures reliable power and data in cold chain and industrial monitoring.
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Can a Smartphone Read RFID?
138Thinking of using your phone as a scanner? We answer "can a smartphone read RFID" and explain the major technical and practical limitations for business use.
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Washable RFID Tags，Enabling Smart Management in the Textile and Laundry Industries
998Washable RFID tags feature high resistance to heat, chemicals, and repeated washing. They play a crucial role in managing hotel linens, industrial laundry, medical textiles, and apparel tracking. This article explores their features, applications,...
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