AET63 Reference Manual
version 1.8 September 2006
Advanced Card Systems Ltd.
Page 10 of 29
byte
1
2
3
4
5
6
7
01
H
91
H
03
H
11
H
22
H
33
H
93
H
7.1.2
Extended Command
A command consists of six protocol bytes and a variable number of data bytes and has the following
structure:
byte
1
2
3
4
5
6 ... N+5 (N>0)
N+6
Header
Instruction
Data Length = N
Data
Checksum
FF
H
Data Length N
Header
01
H
to indicate the start of a standard command.
02
H
to indicate the start of an encrypted command (support from firmware 0.67 onwards,
only used in PTVerifySC
(*)
and PTVerifySCAll
(*)
)
Instruction
The instruction code of the command to be carried out by the AET63.
Data Length
Number of subsequent data bytes, and is encoded in 3 bytes. The first byte is FF
H
. The
second byte and the third byte represent data length N.
Data
Data contents of the command.
For a READ command, for example, the data bytes would specify the start address and the
number of bytes to be read. For a WRITE command, the data bytes would specify the start
address and the data to be written to the card.
The data bytes can represent values to be written to a card and/or command parameters
such as an address, a counter, etc.
Checksum
The checksum is computed by XORing all command bytes including header, instruction,
data length and all data bytes.
Note (*) :
Please refer to “BioTRUSTKey API Manual.doc” for the descriptions of PTVerifySC and
PTVerifySCAll.
7.2 Response
The response from the AET63 to any command depends on whether the command has been received by the
reader without error (e.g., checksum error).
7.2.1
No transmission error with normal response (Length < 255 bytes)
The response by the AET63 to a correctly received command consists of three protocol bytes, two status
bytes and a variable number of data bytes and has the following structure:
