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7.3.
ATR Strings
A classic smart card sends an “answer to reset” through the smart card reader to the host operating
system upon completion of its reset sequence. This behaviour is emulated for the contactless system.
An ATR is generated according to the PC/SC Interoperability Specification for ICCs and Personal
Computer Systems, Part 3. Requirements for PC-Connected Interface, section 3.1.3.2.3.
Notice that ATR response strings do not contain the UID, i.e. cards to the same type produce the same
ATR. Use the Get UID command if you are interested in the tag’s UID.
7.3.1.
ATR for ISO14443-4
The ATR for an ISO14443-4 card is built around the historical bytes, as received from the tag itself as
the answer to the RATS command. Up to 15 historical bytes are included in the ATR.
Byte
Designation
Value
0
Initial Header
3B
1
T
0
8
n
2
T
D1
80
3
T
D2
01
4..(3+n)
Historical bytes T
1
..T
n
+1
4+n
T
CK
(Check byte)
7.3.2.
ATR for Memory Cards (ISO15693, ISO14443-3 Type A)
Byte
Designation
Value
0
Initial Header
3B
1
T
0
8F
2
T
D1
80
3
T
D2
01
4
Category indicator
80
5
Application identifier presence indicator
4F
6
Length
0C
7..11
Registered Application Provider (PC/SC)
A0 00 00 03 06
12
Standard
SS
13..14
Card name
NN NN
15..18
Reserved
00 00 00 00
19
T
CK
(Check byte)
Standard
Standard
SS
ISO14443-3
03
ISO15693 (-3)
0B
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