ACS ACR 38 User Manual download pdf (Page 10)

ACR38 Reference Manual version 1.9 February 2006

Status Indicates the command execution status:

= command successfully executed

Otherwise = error in command data, or command cannot be executed

A table listing the possible values of the status byte and the corresponding meaning is given

in Appendix B.

Data Length Number of subsequent data bytes, and is encoded in 2 bytes. The first byte (MSB) and

second byte (LSB) 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.

Note: Responses are sent from ACR38 to the host computer through BULK IN endpoint.

7.3 Card Status Message

When a card is being inserted into the reader or an inserted card is being removed from the reader while the

reader is idle, i.e., not executing a command, the reader transmits a Card Status Message to notify the host

computer of the change in the card insertion status.

The Card Status Messages have the following structure and contents:

Card Status Message for Card Insertion

Byte 1 2 3 4

Header Status Data Length

Card Status Message for Card Removal

Byte 1 2 3 4

Header Status Data Length

A card status message is transmitted only once for every card insertion or removal event. The reader does

not expect an acknowledge signal from the computer. After transmitting a status message, the reader waits

for the next command from the computer.

Note: Card status messages are sent from ACR38 to the host computer through INTERRUPT IN endpoint.

 Advanced Card Systems Ltd. Page 10 of 43

1 2 ... 5 6 7 8 9 10 11 12 13 14 15 ... 42 43

No comments

ACS ACR 38 User Manual Page 10