ACR1255U-J1 – Reference Manual
Version V1.01
www.acs.com.hk
Page 65 of 73
6.6.12.
Set Auto PPS
Whenever a PICC is recognized, the reader will try to change the communication speed between the
PCD and PICC defined by the maximum connection speed. If the card does not support the proposed
connection speed, the reader will try to connect the card with a slower speed setting.
Set Auto PPS Format (7 bytes)
Command
Class
INS
P1
P2
Lc
Data In
Set Auto PPS
E0h
00h
00h
24h
02h
Max Tx Speed
Max Rx Speed
Set Auto PPS Response Format (9 bytes)
Response
Class
INS
P1
P2
Le
Data Out
Result
E1h
00h
00h
00h
04h
Max Tx
Speed
Current
Tx Speed
Max Rx
Speed
Current
Rx Speed
Where:
Max Tx Speed
1 byte. Maximum Transmission Speed.
Max Rx Speed
1 byte. Maximum Receiving Speed.
Current Tx Speed
1 byte. Current Transmission Speed.
Current Rx Speed
1 byte. Current Receiving Speed.
Value can be: 00h = 106 Kbps
01h = 212 Kbps
02h = 424 Kbps
03h = 848 Kbps
FFh = No Auto PPS
Note: Default setting is 00h.
Notes:
1. Normally, the application should be able to know the maximum connection speed of the
PICCs being used. The environment can also affect the maximum achievable speed. The
reader uses the proposed communication speed to talk with the PICC. The PICC will become
inaccessible if the PICC or the environment does not meet the requirement of the proposed
communication speed.
2. The reader supports different speed between sending and receiving.
