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“Single-bit RFID” commonly describes electronic article surveillance (EAS): a compatible detector can tell that a security marker is present, but the marker does not thereby identify the specific product. That is different from EPC/Gen2 RFID, which can communicate an identifier and may carry additional data.
What “single-bit RFID” means
In retail-security contexts, “single-bit” is a shorthand for a binary result: the system detects a marker or it does not. It is a useful way to explain EAS presence detection, not a claim that every RFID tag contains exactly one bit of memory.
The phrase depends on context. A paper about chipless RFID or a particular one-bit sensor/tag design may use it differently. In those cases, the design and meaning should be defined specifically rather than assumed to describe retail EAS.
How an EAS marker works
An EAS marker is attached to merchandise and used with a compatible detection system. When an active marker passes through a monitored exit, the system can detect its response and trigger an alarm. The result is about the marker’s presence, not a unique product identity.
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EAS systems use different technology families, including microwave, magnetic, acousto-magnetic, and radio frequency approaches. A marker and detector need to be compatible; an EAS label is not a universal tag that works with every gate.
Does a single-bit RFID tag identify the product?
Not in the common EAS usage of “single-bit RFID.” It signals presence to a compatible system; it does not, on that basis alone, report which specific item is being detected.
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An EPC, by contrast, is an identifier syntax assigned to an object or other identifiable entity. EPC data has binary representations suitable for RFID tags, allowing the tag to communicate an identifier to systems that use it.
Single-bit EAS versus EPC/Gen2 RFID
| Aspect | EAS marker (“single-bit” usage) | EPC/Gen2 RFID |
|---|---|---|
| Information communicated | Whether a compatible system detects the marker’s presence. | An EPC identifier and potentially supplemental data, depending on the tag and system. |
| Typical purpose | Retail article surveillance and exit detection. | Identifying or referring to objects in information systems. |
| Compatibility | The marker and detector must use compatible EAS technology. | Tag and reader must support compatible frequency and protocol; RFID implementations vary. |
GS1’s EPC/RFID overview describes EPC identifiers and supplemental data, while the EPC Gen2 standard covers the tag’s radio and logical interface as well as memory. GS1’s Gen2 archive lists version 3.0.1 as published on 26 February 2026; standards can change, so check the current version when implementing a system.
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Why “RFID” alone does not specify what a tag can do
RFID is an umbrella term, not a specific capability. Implementations include active and passive tags and NFC, UHF, HF, and LF variants. Frequency, memory, range, and compatibility depend on the particular technology and system. GS1’s RFID standards overview notes this range of technologies and focuses its standards on passive UHF and HF.
For example, an RF EAS security label is a practical illustration of a presence-detection marker, but it should be used only with a compatible detection system. It should not be treated as a general-purpose RFID identifier.
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Which term should you use?
- Use EAS marker when you mean a retail security marker detected at a monitored exit.
- Use EPC/RFID tag when the tag carries an identifier used to identify or refer to an item.
- Use single-bit RFID only when the context makes clear whether it means EAS presence detection or a different one-bit design.
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