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6 . 1 . 1
A B x C o m m a n d S t r u c t u r e s
All ABx-based RFID commands contain certain fundamental packet elements,
including a Command Header, a Command ID, one or more Command
Parameters (when applicable) and a Command Terminator.
Command Packet Structure = [Command Header + Command ID + Command Parameters
+ Command Terminator]
6 . 1 . 2
A B x P r o t o c o l s - H e a d e r s a n d T e r m i n a t o r s
In ABx Standard, commands begin with the one-byte command header "0xAA," and
end with the two-byte command terminator "0xFF, 0xFF".
In ABx Fast, commands begin with the two-byte command header "0x02, 0x02" and
end with the one-byte command terminator "0x03."
See the table below for further clarification.
ABx Prot oc o ls - H ead ers an d Te rmin ato rs
A B X P R O T O C O L
ABx Fast
ABx Standard
When a command is issued by the host, the RFID controller stores the incoming data
packet in a buffer while it scans the data for a start character (0x02, 0x02 or 0xAA).
When a start character is found, it checks for the proper terminator (0x03 or 0xFF,
0xFF). Having identified a potentially valid command string, the controller will verify
the format of the data and either perform the requested function or generate an error
message.
6 . 1 . 3
A B x R e s p o n s e S t r u c t u r e s
After completing an ABx command, the C0405 generates a host-bound, response
packet that indicates the status and/or results of the attempted command. The
response packet structure for all ABx protocols consists of a Response Header, a
Command Echo, one or more Response Values (when applicable), and a
Response Terminator.
Response Packet Structure = [Response Header + Command Echo + Response Values +
Response Terminator]
Note that for each ABx protocol, response header and response terminator
parameters are the same as their command header and command terminator
counterparts.
C 0 4 0 5 - X X X - 0 1 O P E R A T O R ' S M A N U A L – R E V . 0 3
C H A P T E R 6 : C O M M A N D P R O T O C O L S
H E A D E R
0x02, 0x02
0xAA
Table 6-1: ABx Protocols - Headers and Terminators
T E R M I N A T O R
0x03
0xFF, 0xFF
P A G E 5 2 O F 7 5
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