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C H A P T E R 6 : C O M M A N D P R O T O C O L S
6.2
AB
F
C
P
X
AST
OMMAND
ROTOCOL
The default command protocol used by C0405-Series RFID Controllers for Point-to-
Point data transmission is known as the ABx Fast Command Protocol. ABx Fast
has a single-byte oriented packet structure that permits the rapid execution of RFID
commands while requiring the transfer of a minimal number of bytes.
ABx Fast supports the inclusion of an optional checksum byte. When increased data
integrity is required, the checksum should be utilized. See
for more on
Section 6.2.4
using the checksum parameter.
6 . 2 . 1
A B x F a s t - C o m m a n d / R e s p o n s e P r o c e d u r e
After an RFID command is issued by the host, a packet of data, called the
"Command Packet" is sent to the controller. The command packet contains
information that instructs the controller to perform a certain task.
The controller automatically parses the incoming data packet, searching for a specific
pair of start characters, known as the "Command Header." In ABx Fast, the
Command Header / Start Characters are 0x02, 0x02. When a valid Command
Header is recognized, the controller then checks for proper formatting and for the
presence of a Command Terminator byte. In ABx Fast, the Command Terminator
byte is 0x03.
Having identified a valid command, the controller will attempt to execute the given
instructions. After which the controller will generate a host-bound response message
containing EITHER the results of the attempted command or an error code if the
operation failed.
Note that all commands generate a response from the controller. Before sending a
second or additional command to a C0405, allow the host to first process (remove
from memory) any pending response data.
Figure 6-1: ABx Fast - Command Packet Structure
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
P A G E 5 3 O F 7 5
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