ACS ACR122L, User Manual

Page: 11 / 57

ACR122L – Communication Protocol
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Version 1.03
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Page 11 of 57
5.0. SAM Interface
The ACR122L comes with three SAM interfaces.
5.1. Activating 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 = 02h and ETX = 03h
For SAM Interface 2, STX = 12h and ETX = 13h
For SAM Interface 3, STX = 22h and ETX = 23h
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
03h
Voltage that is applied to the ICC:
00h – Automatic Voltage Selection
01h – 5.0 V
02h – 3.0 V
03h – 1.8 V
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 = 02h and ETX = 03h
For SAM Interface 2, STX = 12h and ETX = 13h
For SAM Interface 3, STX = 22h and ETX = 23h