Document Version 1.2
Last revised on
2017-09-26
Page 15 of 92
Reference Manual for uTrust 4701F and uTrust 4711F Readers
3.6.3.
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 conductive materials like 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 or Foucault’s currents in the conductive materials; the field is literally absorbed
by that kind of material.
It is recommended for proper communication to avoid putting uTrust 47xx F in close proximity
of conductive materials.
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, load of the field increases which implies that less
energy is available for each of them and that the system is detuned. For this reason, Identiv has
implemented in its driver only one slot.
It is recommended to present only one user credential at a time in front of uTrust 47xx F.
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.
uTrust 47xx F was designed and optimized to function with user credentials of various technologies
and sizes.
It may happen, that uTrust 47xx F is not capable of communicating with extremely large or
extremely small credentials.
In order to optimize the coupling between the reader and the credential, it is recommended
to put both antennas as parallel as possible to each other
In order to optimize transaction speed between the reader and the card it is recommended
to 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
3.7.
Applications
3.7.1.
General
uTrust 4701 F is a transparent reader designed to interface a personal computer host supporting PC/SC
interface with 13.56MHz user tokens like public transport cards, contactless banking cards, electronic
identification documents – e.g. e-passports, e-ID cards, driving licenses etc. and smartcards according
to ISO7816 cards like CAC and PKI cards and health insurance cards; and as well as synchronous
memory.
User credentials can have several form factors like credit cards, key fobs, NFC mobile phones or USB
dongles like our uTrust Token products.
uTrust 4711 F incorporates a SAM slot for SIM-sized cards instead of the standard card slot for ID-1
sized cards of the uTrust 4701 F.
