Abx Fast - Command Packet Structure; Table 6-2: Abx Fast - Command Packet Structure - EMS COBALT C0405 Series Operator's Manual

6 . 2 . 2
A B x F a s t - C o m m a n d P a c k e t S t r u c t u r e
The packet structure of all ABx Fast command contains certain basic elements,
including Command Header, Command Size, Command ID and Command
Terminator. Additional options are available depending on the command being
performed.
C O M M A N D P A C K E T E L E M E N T
COMMAND HEADER:
The first two bytes of an ABx Fast command packet
COMMAND SIZE:
This 2-byte integer defines the number of bytes in the packet
(excluding header, command size, checksum and
terminator).
COMMAND ID:
This single-byte value indicates the RFID command to
execute.
START ADDRESS:
This two-byte parameter indicates the location of tag memory
where a read or write operation shall begin.
READ/WRITE LENGTH:
This two-byte parameter represents the number of bytes that
are to be retrieved from or written to the RFID tag.
TIMEOUT VALUE:
This two-byte parameter indicates the maximum length of
time for which the controller will attempt to complete the
command. Measured in milliseconds, this value can have a
range of 0x0001 to 0xFFFE or between 1 and 65,534 msecs.
ADDITIONAL DATA:
This parameter uses one byte to hold a single character for
fill operations and supports the use of multiple bytes when
several characters are needed for write commands (when
applicable).
CHECKSUM:
This optional parameter holds a single-byte checksum (only
applicable when using ABx Fast with Checksum).
COMMAND TERMINATOR:
Single-byte command packet terminator (always 0x03)
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

Table 6-2: ABx Fast - Command Packet Structure

C O N T E N T S I Z E
0x02, 0x02 2 bytes
0x0007 + 2-byte
(number of integer
bytes of
additional
data)
0x06 1 byte
(Write Data)
0x0000 2-byte
integer
0x0001 2-byte
integer
0x07D0 2-byte
integer
(0x07D0 =
2000 x .001 =
2 seconds)
0x00 One or
more bytes
(when
applicable)
Optional 1 byte
(when
applicable)
0x03 1 byte
P A G E 5 4 O F 7 5