User's Manual

ACR122L-ACS Design Specification
Version 0.03 19/05/2010
Page
10
of
50
ACR122L
-
ACS
RDR = ACR122L; HOST = Host Controller.
HOST_to_RDR = Host Controller -> ACR122L
RDR_to_HOST = ACR122L -> Host Controller
Protocol Flow Examples(Use SAM Interface 1 as Example)
1) Activate a SAM
HOST RDR
1. HOST sends a frame

02
62 00 00 00 00 00 01 01 00 00
[Checksum] 03
2. RDR sends back a
positive status frame
immediately
02 00 00 03 (positive status frame)

.. After some processing delay...
3. RDR sends back the
response of the command
02 80 0D 00
00 00 00 01 00 00 00 3B 2A 00
80 65 24 B0 00 02 00 82 90 00 [Checksum]
03

2) Activate a SAM (Incorrect Checksum, HOST)
HOST RDR
1. HOST sends a
corrupted frame

02 62 00 00 00 00 00 01 01 00 00
[Incorrect Checksum] 03
2. RDR sends b
ack a
negative status frame
immediately
02 FF FF 03 (negative status frame)

3. HOST sends the frame
again.

02 62 00 00 00 00 00 01 01 00 00
[Checksum] 03
4. RDR sends back a
positive status frame
immediately
02 00 00 03 (positive status frame)

.. After some processing delay...
5. RDR sends back the
response of the command
02 80 0D 00 00 00 00 01 00 00 00 3B 2A 00
80 65 24 B0 00 02 00 82 90 00 [Checksum]
03
