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SCM3712 REFERENCE MANUAL 17
3.4.3. Recommendations
The communication between the reader and the user token 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 token can
severally 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 SCM3712in
close proximity of conductive materials.
The presence of multiple user tokens in the field also interferes with the communication. When several
user tokens 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, SCM Microsystems has
implemented in its driver the support for 1 slot only.
It is recommended to present only one user credential at a time in front of
SCM3712.
The communication between the reader and the user token is sensitive to the geometry of the system
{reader, user token}. Parameters like the geometry and especially the relative size, position and
orientation of the reader and user token antennas directly influence the inductive coupling and
therefore the communication.
SCM3712 was primarily designed and optimized to function with user credentials of various
technologies having the size of a credit card.
It may happen that SCM3712is not capable of communicating with extremely
large or extremely small antennas.
In order to optimize the coupling between the reader and the user token, it is
recommended to put both antennas as parallel as possible
In order to optimize transaction speed between the reader and the card it is
recommended to place the user token 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
- SCM3712 1
- Reference manual 3
- Document history 4
- Contact information 4
- Table of Contents 5
- LIST OF FIGURES 8
- LIST OF TABLES 9
- 1. Legal information 10
- 2.2. Target audience 11
- REFERENCE MANUAL 8 12
- 2.5. References 13
- 2.6. Conventions 14
- 3.1. SCM3712 key benefits 15
- 3.2. SCM3712 key features 15
- REFERENCE MANUAL 12 16
- REFERENCE MANUAL 13 17
- User Tokens and/or 18
- NFC SmartPhone 18
- 0123 4567 18
- SCM 3712 18
- 3.4.1. Power supply 20
- 3.4.2. Data exchange 20
- 3.4.3. Recommendations 21
- 3.5. Applications 22
- REFERENCE MANUAL 19 23
- 4. SCM3712 characteristics 24
- REFERENCE MANUAL 21 25
- 4.2. Quick reference data 26
- REFERENCE MANUAL 23 27
- REFERENCE MANUAL 24 28
- 5. Hardware 29
- 5.3. Antenna 30
- 6. Software modules 31
- REFERENCE MANUAL 28 32
- 6.2. Utilities 33
- 6.3. Driver 34
- REFERENCE MANUAL 31 35
- REFERENCE MANUAL 32 36
- REFERENCE MANUAL 33 37
- REFERENCE MANUAL 34 38
- REFERENCE MANUAL 35 39
- 7. Firmware 40
- 8. Commands description 41
- 8.1.2. Get DATA Command 42
- 8.1.2.1. Description 42
- 8.1.2.2. Format 42
- 8.1.2.3. Response 42
- 8.1.2.4. Status Words 42
- REFERENCE MANUAL 39 43
- REFERENCE MANUAL 40 44
- REFERENCE MANUAL 41 45
- 8.2.1.5. Example 46
- REFERENCE MANUAL 43 47
- 8.2.2.5. Example 48
- REFERENCE MANUAL 45 49
- 8.2.4.1. Description 50
- 8.2.4.2. Format 50
- 8.2.4.3. Response 50
- 8.2.4.4. Status Words 50
- 8.2.4.5. Example 51
- REFERENCE MANUAL 48 52
- REFERENCE MANUAL 49 53
- REFERENCE MANUAL 50 54
- REFERENCE MANUAL 51 55
- 8.5.1.3. Read Byte (READ) 56
- REFERENCE MANUAL 53 57
- REFERENCE MANUAL 54 58
- REFERENCE MANUAL 55 59
- 8.5.3.1. REQC 60
- 8.5.3.2. Request Service 61
- 8.5.3.3. Request response 61
- 8.5.3.4. Read 61
- 8.5.3.5. Write 62
- 8.6.1.1. Description 63
- 8.6.1.2. Input buffer 63
- 8.6.1.3. Output buffer 63
- REFERENCE MANUAL 61 65
- REFERENCE MANUAL 62 66
- 8.6.8.1. Description 67
- 8.6.8.2. Input buffer 67
- 8.6.8.3. Output buffer 67
- REFERENCE MANUAL 64 68
- Generic IOCTLs 69
- 8.7.1. IOCTL_GET_CARD_TYPE 69
- 8.7.1.1. Description 69
- 8.7.1.2. Input buffer 69
- REFERENCE MANUAL 66 70
- 8.7.2.4. Output buffer 71
- 8.7.2.5. Return Value 71
- 8.7.3.1. Description 72
- 8.7.3.2. Input buffer 72
- 8.7.3.3. Output buffer 72
- 8.7.3.4. Return Value 72
- 8.8.1. IOCTL_INITIATOR_POLL 73
- 8.8.1.1. Description 73
- 8.8.1.2. Input Buffer 73
- 8.8.1.3. Output Buffer 73
- 8.8.1.4. Return Value 74
- 8.8.2.1. Description 74
- 8.8.2.2. Input Buffer 74
- 8.8.2.3. Output Buffer 74
- REFERENCE MANUAL 71 75
- P2P Target Mode IOCTLs 76
- 8.8.5.2. Input Buffer 77
- 8.8.5.3. Output Buffer 77
- 8.8.5.4. Return Value 77
- 8.8.6. IOCTL_TARGET_SEND 78
- 8.8.6.1. Description 78
- 8.8.6.2. Input Buffer 78
- 8.8.6.3. Output Buffer 78
- 8.8.6.4. Return Value 78
- 9. Annexes 79
- REFERENCE MANUAL 76 80
- REFERENCE MANUAL 77 81
- REFERENCE MANUAL 78 82
- REFERENCE MANUAL 79 83
- Background Metal Plate 84
- External Antenna 84
- SCM3712 ANT 84
- REFERENCE MANUAL 82 86
- REFERENCE MANUAL 83 87
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