Specifications

ADT60/AET60 Reference Manual version 1.5 November 2005
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 Always 01
H
to indicate the start of a command.
Instruction The instruction code of the command to be carried out by the BioCARDKey/BioSIMKey.
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.
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