BS ISO IEC 15693 — Vicinity Cards Standard Series

📐 BS ISO/IEC 15693 is the British Standards Institution (BSI) adoption of ISO/IEC 15693, a series on contactless integrated circuit cards under the general title Identification cards — Contactless integrated circuit cards — Vicinity cards, developed by ISO/IEC JTC 1/SC 17 (Cards and personal identification), with UK participation through IST/17. Vicinity cards operate at 13.56 MHz with a typical reading distance up to about 1 metre — further than ISO/IEC 14443 proximity cards — and are widely used in library collection management, asset tracking, ticketing and access control, and supply chain management where batch identification at a moderate distance is needed. The series has three parts: Part 1 defines physical characteristics, Part 2 defines the air interface and initialization, and Part 3 defines the anticollision and transmission protocol.

💡 The key difference between ISO/IEC 15693 and ISO/IEC 14443 is read distance and card type: 14443 is “proximity” (centimetres), 15693 is “vicinity” (up to about 1 metre). The latter emphasizes batch, medium-distance, fast inventory — for example, a single sweep can count an entire shelf of books or a whole pallet of assets.

1. Series Composition and Evolution 📚

The BS ISO/IEC 15693 series is divided into three parts, each addressing one key technical aspect of the card system:

BS ISO/IEC 15693-1:2010 (Physical characteristics): second edition, published by ISO/IEC on 1 October 2010 and adopted by BSI on 30 November 2010, superseding the withdrawn BS ISO/IEC 15693-1:2000, ISBN 978 0 580 69842 2, ICS 35.240.15.
BS ISO/IEC 15693-2:2006 (Air interface and initialization): second edition, published by ISO/IEC on 15 December 2006, with the British version issued by BSI on 31 January 2007, superseding the withdrawn BS ISO/IEC 15693-2:2000, ISBN 978 0 580 50050 3.
BS ISO/IEC 15693-3:2009 + A2:2015 (Anticollision and transmission protocol): second edition, published 15 April 2009, amended by ISO/IEC amendment 2 (implemented 31 August 2015) to form BS ISO/IEC 15693-3:2009+A2:2015, superseding the withdrawn BS ISO/IEC 15693-3:2009+A3:2015, ISBN 978 0 580 84779 0. Text introduced or altered by an amendment is flagged in the standard with tags carrying the amendment number.

⚠️ A version detail worth noting: BS ISO/IEC 15693-3:2009+A2:2015 supersedes the nominally higher-numbered 2009+A3:2015 edition. This arises from a mismatch between ISO/IEC amendment numbering and the order in which BSI implemented them — BSI implemented ISO amendment 3 on 31 July 2015 and then amendment 2 on 31 August 2015, combining into the current edition. Always check the full edition and amendment designation on the cover when purchasing or referencing the standard.

2. Part 1: Physical Characteristics 💳

BS ISO/IEC 15693-1:2010 defines the physical characteristics of vicinity cards, including card dimensions, mechanical strength, resistance to temperature and humidity, flexing and twisting resistance, ultraviolet (UV) stability, and electrostatic discharge (ESD) susceptibility. The card dimensions conform to the ID-1 format defined by ISO/IEC 7810 (85.60 mm × 53.98 mm), ensuring compatibility with standard card wallets, slots, and printing equipment; additional controls are placed on the packaging position and thickness uniformity of the embedded antenna and chip for the radio-frequency environment.

Verification of physical characteristics follows defined test methods and conditions — for example extreme temperature cycling, hot-humid storage, bending tests, and twisting tests — and the results must meet the acceptance criteria given in Part 1. The part also provides guidance on radio-frequency performance at adjacent frequencies, laying the physical foundation for the air-interface testing in Part 2.

3. Part 2: Air Interface and Initialization 📡

BS ISO/IEC 15693-2:2006 defines the air interface and initialization between the coupling device (VCD, Vicinity Coupling Device) and the card (VICC, Vicinity Integrated Circuit Card), and is the technical core of the series. Its main content includes:

Power transfer and operating frequency: the carrier frequency is 13.56 MHz ± 7 kHz; the card is powered through inductive coupling of the reader’s RF field, with T = 0 (low-frequency) mode enabling battery-less passive operation.
Signal interface (VCD to VICC): modulation method (ASK, modulation index), data rates and data coding (for example 1 of 4 coding and 1 of 256 coding), plus frame format, start/end flags and CRC check.
Signal interface (VICC to VCD): load modulation, subcarrier frequency, data transmission format and rates, allowing the card to return data to the reader.
Initial dialogue sequence: the initial timing, command/response scheme, and conditions under which a card enters the working state.

Technical Element	Typical Requirement	Purpose
Operating frequency	13.56 MHz ± 7 kHz	Resonance matching and worldwide ISM band
Power transfer	Inductive coupling, T=0 mode	Energise passive cards, support medium range
VCD→VICC modulation	ASK, 1 of 4 / 1 of 256 coding	Downlink command and data-rate selection
VICC→VCD communication	Load modulation, subcarrier	Uplink data return
Framing and check	SOF/EOF flags, CRC	Frame synchronisation and data integrity

💡 “Initialization” is more than power-up and read: the VICC must pass through a defined state machine (standby, ready, quiet, and other states) before it can respond. The 1 of 4 and 1 of 256 codings provide high and low data-rate channels — the low rate travels farther and resists interference better, while the high rate gives higher throughput, so the choice should weigh the actual environment.

4. Part 3: Anticollision and Transmission Protocol 🔀

BS ISO/IEC 15693-3:2009 + A2:2015 defines the anticollision mechanism used when several cards are simultaneously in the reader field, plus the complete transmission protocol. In batch identification scenarios (for example, inventorying a whole bookshelf), multiple VICCs may respond to the same VCD request; Part 3 provides a slot-based mechanism to resolve each card’s unique identifier (UID) so cards can communicate in an orderly sequence. The part also defines a complete command set:

Inquiry commands: INVENTORY (request/response with anticollision), STAY QUIET (put a specified card into quiet state), and so on.
Read/write commands: READ SINGLE BLOCK, WRITE SINGLE BLOCK, LOCK BLOCK, READ MULTIPLE BLOCKS, WRITE MULTIPLE BLOCKS, supporting block-addressed data access.
Application commands: GET SYSTEM INFORMATION (retrieving UID, DSFID, AFI, and so on), SELECT (select a specific card), and similar.
Addressing modes: both “addressed mode” (targeting a single specified card) and “non-addressed mode” (broadcast to all cards in the field) are supported, combined with AFI (Application Family Identifier) and DSFID (Data Storage Format Identifier) for application-level filtering.

🚨 An easily overlooked interference issue: 15693 cards read at greater distance, but greater distance often brings stronger multipath reflection and nearby-metal interference. In metal-dense environments such as shelves and racks, perform on-site field-strength testing, adjust reader antenna position and power, and reserve sufficient anticollision slots to avoid missed reads during inventory.

5. Applications and Selection Guidance 🏷️

With metre-level read distance and batch anticollision capability, 15693 cards have become a typical choice for medium-range contactless identification:

Library collection management: with 15693 tags on book spines, a single pass of a handheld reader can count an entire shelf, greatly improving inventory efficiency.
Asset tracking: batch identification of server racks, pallets, tools and other bulk assets, combined with a warehouse system for fast in/out reconciliation.
Ticketing and access control: supports ticket checking and passage at a greater distance, often used for conference wristbands, pool lockers, and visitor management.
Healthcare and archives: scenarios needing fast batch reading of medical records, specimens and consumables, reducing the time of contact-based reading.

✅ Selection tip: if you only need point-to-point identification within 5–10 cm (payment, mobile door opening), ISO/IEC 14443 is more suitable; if you need batch, medium-range inventory with moderate security needs, ISO/IEC 15693 offers better cost-effectiveness; if higher security is also required, combine 15693 with an application-layer key-authentication scheme (for example DES/AES-based card security).

6. Conformance Testing and Compliance Points 🧪

Consistency and interoperability of the 15693 series depend on companion test standards and methods:

Cards and readers should be tested against the air-interface parameters in Part 2 (frequency tolerance, modulation depth, frame format, CRC) to ensure cross-vendor interoperability.
The anticollision timing, command format, and response codes in Part 3 are the focus of protocol conformance testing; non-standard timing may work in a single-vendor system but cannot guarantee cross-vendor compatibility.
Physical-characteristic tests (Part 1) should be carried out under specified temperature, humidity and mechanical conditions, and the test report should retain traceable records.

⚠️ Compliance reminder: when building an application with 15693 cards, also consider radio regulations in the operating country (for example the EU RED Directive, national type approval). Although 13.56 MHz is a worldwide ISM band, transmit-power and spurious-emission limits may differ by region.

7. Frequently Asked Questions ❓

❓ Q: How much do the read distances of 15693 and 14443 differ?
A: Typical 14443 cards read at 5–10 cm (contactless/close-coupled), while 15693 is designed for about 1 metre (up to roughly 1.5 m depending on antenna and tag size). The difference arises from different power-transfer and coding emphasis in the air interface.

❓ Q: Why do both “+A2:2015” and “+A3:2015” appear for 15693-3?
A: ISO/IEC published several amendments to 15693-3:2009, and BSI implemented them in sequence, marking the adopted combination on the cover. The current British edition is 15693-3:2009+A2:2015 (A2 implemented 2015-08-31), which earlier had adopted +A3:2015; always reference the latest BSI catalogue edition when purchasing.

❓ Q: Can 15693 cards meet payment-grade security?
A: The 15693 standard itself focuses on physical, air-interface and protocol aspects and does not mandate cryptographic algorithms. Security depends on the chip and application layer; for high-security use, add authentication and encryption, or use a standard with higher security requirements.

🔍 Q: In batch inventory, will too many cards interfere and cause missed reads?
A: Yes — this is precisely why the Part 3 anticollision protocol exists. The reader uses the INVENTORY command with a slot framework (typically a 1/16-slot frame) to identify each card in turn, and can use AFI filtering to respond only to cards in the relevant application family. Extreme congestion can still exhaust the slots, so reduce missed reads through repeated sweeps and sub-field selection.

📌 Q: Can a 15693 reader read 14443 cards, and vice versa?
A: Not directly. Both use the 13.56 MHz band, but modulation, coding, frame format, anticollision protocol and command set differ; a dual-protocol reader needs two RF front-ends and protocol stacks, each tested to its own standard.

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