ACR122L – Communication Protocol
Version 1.03
www.acs.com.hk
Page 14 of 57
Example 1:
To deactivate the
SAM Interface 1
slot 0 (default), sequence number = 2.
HOST ->
02
63 00 00 00 00 00 02 00 00 00 [Checksum]
03
RDR ->
02
00 00
03
RDR ->
02
81 00 00 00 00 00 02 00 00 00 [Checksum]
03
Example 2:
To deactivate the
SAM Interface 2
slot 0 (default), sequence number = 2.
HOST ->
12
63 00 00 00 00 00 02 00 00 00 [Checksum]
13
RDR ->
12
00 00
13
RDR ->
12
81 00 00 00 00 00 02 00 00 00 [Checksum]
13
Example 3:
To deactivate the
SAM Interface 3
slot 0 (default), sequence number = 2.
HOST ->
22
63 00 00 00 00 00 02 00 00 00 [Checksum]
23
RDR ->
22
00 00
23
RDR ->
22
81 00 00 00 00 00 02 00 00 00 [Checksum]
23
5.3. Exchanging data through the SAM Interface
ACR122L Command Frame Format
STX
Bulk-OUT Header
(HOST_to_RDR_XfrBlock)
Parameters
Checksum
ETX
1 Byte
10 Bytes
M 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_XfrBlock Format
Offset
Field
Size
Value
Description
0
bMessageType
1
6Fh
1
dDwLength
<LSB .. MSB>
4
M
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
bBWI
1
00-FFh Used to extend the Block Waiting Timeout.
8
wLevelParameter
2
0000h
