User's Manual

ACR122L-ACS Design Specification
Version 0.03 19/05/2010
Page
12
of
50
ACR122L
-
ACS
To activate the SAM Interface
ACR122L Command Frame Format
STX Bulk-OUT Header
(HOST_to_RDR_IccPowerOn)
Parameters Checksum ETX
1 Byte 10 Bytes 0 Byte 1 Byte 1 Byte
For SAM Interface 1, STX = 0x02 and ETX = 0x03
For SAM Interface 2, STX = 0x12 and ETX = 0x13
For SAM Interface 3, STX = 0x22 and ETX = 0x23
HOST_to_RDR_IccPowerOn Format
Offset Field Size Value Description
0 bMessageType 1 62h
1 dDwLength
<LSB .. MSB>
4 00000000h Message-specific data length
5 bSlot 1 00-FFh Identifies the slot number for this
command. Default=00h
6 bSeq 1 00-FFh Sequence number for command
7 bPowerSelect 1 00h, 01h,
02h, or 03h
Voltage that is applied to the ICC
00h – Automatic Voltage Selection
01h – 5.0 volts
02h – 3.0 volts
03h – 1.8 volts
8 abRFU 2 Reserved for Future Use
ACR122L Response Frame Format
STX Bulk-IN Header
(RDR_to_HOST_DataBlock)
abData Checksum ETX
1 Byte 10 Bytes N Bytes
(ATR)
1 Byte 1 Byte
For SAM Interface 1, STX = 0x02 and ETX = 0x03
For SAM Interface 2, STX = 0x12 and ETX = 0x13
For SAM Interface 3, STX = 0x22 and ETX = 0x23