ACM1252U-Y3
– Reference Manual
Version 1.03
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5.3.12.
Set Auto PPS
Whenever a PICC is recognized, the reader will try to change the communication speed between the
PCD and PICC as defined by the maximum connection speed. If the card does not support the
proposed connection speed, the reader will try to connect to 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
Maximum Tx Speed (1 Byte)
Current Tx Speed
Current Tx Speed (1 Byte)
Max Rx Speed
Maximum Rx Speed (1 Byte)
Current Rx Speed
Current Rx Speed (1 Byte)
00h = 106 Kbps; default setting, equal to No Auto PPS
01h = 212 Kbps
02h = 424 Kbps
Notes:
1. Normally, the application should know the maximum connection speed of the PICCs being
used. The environment also affects the maximum achievable speed. The reader just uses the
proposed communication speed to talk with the PICC. The PICC will become inaccessible is
the PICC or environment does not meet the requirement of the proposed communication
speed.
2. The reader supports different speed between sending and receiving.