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CHAPTER 6:
COMMAND PROTOCOLS
6.1
AB
X
When an RFID command is issued, the host computer instructs the RFID controller to
perform a given task. After performing that task, the RFID controller will normally
reply back with a Command Response message indicating the status or results of the
attempted command. This response notifies the host as to whether the command
was successfully completed or if the RFID controller failed to complete the command.
To understand and execute RFID commands, the C0405 and the host must be able
to communicate using the same language. The language that is used to
communicate RFID commands is referred to as the Command Protocol. The type of
Command Protocol that is used is known as the ABx Command Protocol, of which
there are two primary variations. The two versions of the ABx Command Protocol that
are supported by the C0405-Series RFID Controller are:
• ABx Fast (default)
• ABx Standard
The ABx Fast Command Protocol has a single-byte based packet structure that
permits the execution of RFID commands while requiring the transfer of fewer total
bytes than ABx Standard. ABx Fast is the default command protocol used by C0405
RFID Controllers. It can be used with or without a checksum byte.
The ABx Standard Command Protocol uses a double-byte, word based format that
shares a common syntax with most existing RFID systems produced by Escort
Memory Systems. This protocol offers legacy support, which may be required by
existing PLC applications that only support a 2-byte word packet format. If your
application requires compatibility with existing or legacy RFID devices from Escort
Memory Systems', use ABx Standard. ABx Standard does not support the use of a
checksum byte.
NOTE:
By default, the C0405 is configured to use the ABx Fast Command Protocol. ABx Fast
(as the name suggests) is the faster and more efficient of the two ABx protocols,
offering increased communication speed and error immunity.
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
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OMMAND
ROTOCOL
C H A P T E R 6 : C O M M A N D P R O T O C O L S
O
VERVIEW
P A G E 5 1 O F 7 5
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