ACS ACR89U-A1, Reference Manual

Page: 11 / 57

ACR89U-A1 – Reference Manual
info@acs.com.hk
Version 1.04
www.acs.com.hk
Page 11 of 57
3.3.1.7. PC_to_RDR_SetParameters
Sets slot parameters.
Offset Field Size Value Description
0 bMessageType 1 61h -
1 dwLength 4 - Size of extra bytes of this message
5 bSlot 1 -
Identifies the slot number for this
command
6 bSeq 1 - Sequence number for command
7 bProtocolNum 1 -
Specifies what protocol data
structure follows.
00h = Structure for protocol T=0
01h = Structure for protocol T=1
The following values are reserved
for future use.
80h = Structure for 2-wire protocol
81h = Structure for 3-wire protocol
82h = Structure for I2C protocol
8 abRFU 2 - Reserved for future use
10
abProtocolDataStructure
Byte
array
- Protocol Data Structure
Protocol Data Structure for Protocol T=0 (
dwLength =00000005h)
Offset Field Size Value Description
10 bmFindexDindex 1 -
B7-4 – FI – Index into the table 7 in
ISO/IEC 7816-3:1997 selecting a clock
rate conversion factor
B3-0 – DI - Index into the table 8 in
ISO/IEC 7816-3:1997 selecting a baud
rate conversion factor
11 bmTCCKST0 1 -
B0 – 0b, B7-2 – 000000b
B1 – Convention used (b1=0 for direct,
b1=1 for inverse)
Note: The CCID ignores this bit.
12 bGuardTimeT0 1 -
Extra Guardtime between two characters.
Add 0 to 254 etu to the normal guardtime
of 12etu. FFh is the same as 00h.
13 bWaitingIntegerT0 1 - WI for T=0 used to define WWT