天安信CLOUD370xF NFC桌面读写器用户手册

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"《uTrust_370xF 用户手册》是一份详细的文档，针对天安信技术公司生产的CLOUD3700F和CLOUD3701F（日本限定版本）NFC桌面读卡器。该手册适用于系统集成商和软件开发者，旨在提供关于CLOUD370x系列接触式无源读卡器的硬件和软件特性的深入信息。文档版本为1.0，最后一次修订日期为2014年7月22日。内容覆盖了法律声明、免责声明、符合美国联邦通信委员会（FCC）规则的部分，以及软件许可等相关条款。其中，法律声明部分明确了产品的责任范围，包括可能存在的限制和免责声明，确保用户理解和遵守相关规定。在FCC规则部分，文档详细解释了第15章的15.21节，这是关于向用户提供的信息要求，确保设备符合辐射发射标准。同时，还提到了第15章、子部分C的15.225节，这是关于Class B设备的规定，可能涉及功率等级和干扰控制的要求。软件许可证部分则涉及到产品所使用的知识产权和使用限制，开发者在利用该读卡器进行NFC开发、应用或调试时，需要了解并遵守这些条款，以确保合法性和兼容性。手册还可能包含了安装指南、配置步骤、API参考、错误代码解析、固件更新方法等实用信息，以便用户在实际操作中能够高效地使用和维护这些NFC读卡器。对于想要深入了解和开发NFC技术的工程师而言，这份用户手册是不可或缺的参考资料，它提供了技术细节和最佳实践，帮助他们提升NFC应用的性能和用户体验。"

Reference Manual for the CLOUD 370x F Contactless Desktop Readers

Document Version 1.0 Last revised on 2014-07-22 Page 14 of 82

3.4: Customization Options

Upon request and based on a minimum order quantity, Identiv can consider customizing the reader’s:

• Product label

• Identification text strings

• Logo

• Casing colors

For more information about customizing this product, please contact your local Identiv representative

or send an email to

sales@identiv.com.

3.5: Contactless Communication Principles and CLOUD 370x F Usage

Recommendations

The CLOUD 370x F is a contactless reader

designed to communicate with user tokens, which are also

known as user credentials. User tokens

contain a contactless integrated circuit card connected to an

antenna.

User tokens can take several form factors, including:

• Credit card sized smart card

• Key fob

• USB token

• NFC mobile phone

Communication between a CLOUD 370x F reader and user credentials uses magnetic field inductive

coupling. The magnetic field generated by a CLOUD 370x F reader has a carrier frequency of

13.56 MHz.

3.5.1: Power Source for the User Credential

When the user credential is placed within the magnetic field of the reader, its antenna couples with the

reader and an induction current appears in the credential’s antenna, thus providing power to the

integrated circuit. The generated current is proportional to the magnetic flux going through the

antenna of the user credential.

3.5.2: Data Exchange

The carrier frequency of the magnetic field is used as a fundamental clock signal for the communication

between the reader and the credential. It is also used as a fundamental clock input for the integrated

circuit microprocessor to function.

To send data to the user credential, the reader modulates the amplitude of the field. There are several

amplitude modulation and data encoding rules defined in ISO/IEC 14443, which you can refer to for

further details.

To answer the reader, the integrated circuit card of the user credential modulates its way of loading

(impedance) the field generated by the reader. Further details about this can be found in ISO/IEC

14443.

In the ISO/IEC 14443 standard, the reader is called the proximity coupling device (PCD).

In the ISO/IEC 14443 standard, the user token is called proximity integrated chip card (PICC).

CLOUD

370

x F

User tokens

CLOUD 370x F

Reference Manual for the CLOUD 370x F Contactless Desktop Readers

Document Version 1.0 Last revised on 2014-07-22 Page 15 of 82

3.5.3: Recommendations

The communication between the reader and the user credential is sensitive to the presence of material

or objects interfering with the magnetic field generated by the reader. The presence of electrically

conductive materials such as metal in the vicinity of the reader and the user credential can significantly

degrade the communication and even make it impossible. The magnetic field of the reader generates

eddy currents (also known as Foucault’s currents) in the conductive materials; the field is literally

absorbed by that kind of material.

• For proper communication, avoid putting your CLOUD 370x F reader in close proximity to

conductive materials. A minimum distance of 2.5 cm (1”) should be kept.

• To prevent the fields of adjacent readers from interfering with each other, a minimum distance

between readers of 2.5 cm (1”) should be kept.

The presence of multiple user credentials in the field also interferes with the communication. When

several user credentials are in the field of the reader, the load of the field increases which makes less

energy available for each of them and the system is detuned. For this reason, Identiv has implemented

only one slot in its driver.

• It is recommended that you present only one user credential at a time to a CLOUD 370x F reader.

The communication between the reader and the credential is sensitive to the geometry of the system

{reader, credential}. Parameters like the geometry, and especially the relative size of the reader’s and

credential’s antennas, directly influence the inductive coupling and therefore the communication.

The CLOUD 370x F reader was designed and optimized to function with user credentials of various

technologies and sizes. Even so:

• A CLOUD 370x F reader might not be capable of communicating with extremely large or extremely

small credentials.

• To optimize the coupling between the reader and the credential, put both antennas as parallel as

possible to each other.

• To optimize transaction speed between the reader and the card, place the credential as close as

possible to the reader. This will increase the amount of energy supplied to the user credential,

which will then be able to use its microprocessor at higher speeds.

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