User's Manual

ACR122L-ACS Design Specification

Version 0.03 19/05/2010

Page

ACR122L

ACS

Example1. 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

Example2. 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

Example3. 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

To do data-exchange 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 = 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_XfrBlock Format

Offset Field Size Value Description

0 bMessageType 1 6Fh

1 dDwLength

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