Specifications

ADT60/AET60 Reference Manual version 1.5 November 2005
7.2.2 No transmission error with extended response
The response by the BioCARDKey/BioSIMKey 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:
byte 1 2 3 4 5 6 7 ... N+6
(N>0)
N+7
Header SW1 SW2 Data length = N Data Checksum
FF
H
Data Length N
Header Always 01
H
to indicate the start of the response.
SW1 Indicates the command execution status:
90
H
= command successfully executed
60
H
= error in command data; command cannot be executed
67
H
= error detected in command execution
FF
H
= status message initiated by the reader
SW2 Further qualification of the command execution status.
A table listing the possible values of the status bytes SW1 and SW2 and the corresponding
meaning is given in Appendix B.
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_DATA command, for example, the data bytes would contain the contents of the
memory addresses read from the card. The data bytes can represent values read from the
card and/or status information.
Checksum The checksum is computed by XORing all response bytes including header, status bytes,
data length and all data bytes.
7.2.3 Transmission error
If the receiving party of a command (i.e., the BioSIMKey) or a response (i.e., the computer) detects an error
in the data length or the checksum of a command, it disregards the received data and sends a "NOT
ACKNOWLEDGE" message to the transmitting party upon completion of the faulty transmission. The "NOT
ACKNOWLEDGE" message consists of two bytes:
byte 1 2
05
H
05
H
If the BioCARDKey/BioSIMKey responds with a 'NOT ACKNOWLEDGE' message to a command from the
computer, the computer would normally transmit the command again.
If the computer detects a transmission error in a response from the BioCARDKey/BioSIMKey, it can send
the 'NOT ACKNOWLEDGE' to the reader upon which the reader will transmit the most recent response
again.
 Advanced Card Systems Ltd. Page 11 of 25