ACS ACR122L, User Manual

Page: 13 / 57

ACR122L – Communication Protocol
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Version 1.03
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Page 13 of 57
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_IccPowerOff Format
Offset Field Size Value Description
0
bMessageType
1 63h
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
abRFU
3 Reserved for Future Use.
ACR122L Response Frame Format
STX
Bulk-IN Header
(RDR_to_HOST_SlotStatus)
abData 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
RDR_to_HOST_DataBlock Format
Offset Field Size Value Description
0
bMessageType
1 81h
Indicates that a data block is being
sent from the ACR122L.
1
dwLength
<LSB .. MSB>
4 0 Size of abData field (0 Bytes).
5
bSlot
1 Same as Bulk-OUT Identifies the slot number for this
command.
6 bSeq 1 Same as Bulk-OUT Sequence number for
corresponding command.
7
bStatus
1
8
bError
1
9
bClockStatus
1