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ACR89U-A2 – Reference Manual
Version 1.01
www.acs.com.hk
Page 26 of 57
3.5.3.
Extended Command Pipe Bulk-IN Message
This section defines response messages to the extended commands returned by ACR89 for operating
additional features that CCID does not cover. These messages are always responded using
RDR_to_PC_Escape
Bulk-IN message in standard CCID Session 4.2.2.4.
The response format defined in this section will be the
abData
to be filled in the
RDR_to_PC_Escape
messages. Similar to CCID message structure, the response format consists of fixed length Response
Header and variable length Response Data portion. The response header is fixed to 5 bytes in length.
In contrast to CCID/USB practice, big endian will be adopted in extended response portion.
Figure 4
: CCID RDR_to_PC_Escape Message
CCID Header
(10 bytes)
Extended Response
Header (5 bytes)
Extended Response
Data
CCID RDR_to_PC_Escape Message
Extended Response