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CHAPTER 3: RFID COMMANDS
3.1.1 Command Packet Structure Table
Word
#
MSB LSB Description
01
00
06 (+
number of
additional
data
words, if
any)
OVERALL LENGTH:
The first word in a command packet is the
Overall Length. This 2-byte value indicates the
total number of words in the command (including
this - the Overall Length field). This value will
always be at least six words (0x0006).
02
AB 03
COMMAND ID:
The second word contains the Command ID. For
example: Write Data Command = 0xAB03
See the Section 3.2.1 - RFID Command Table for
a complete list.
03
00 01
NODE ID:
The third word contains the Node ID of the
antenna / controller for which the command is
directed. This value should always be 0x0001 for
the HS500E.
04
00 32
TIMEOUT VALUE:
Word four in a command packet contains the 2-
byte Timeout Value. This value sets the
maximum length of time for which the HS500E
will attempt to complete the given command. This
“time limit” is measured in 1/10
th
(.10) second
increments, where 0x0032 = 50 x .10 = 5
seconds.
05
00 01
START ADDRESS:
The fifth word, Start Address, indicates the
location of tag memory where a read or write
operation will begin (when applicable).
06
00 01
READ/WRITE LENGTH:
The Read/Write Length is the sixth word (when
applicable) and represents the number of bytes
that are to be retrieved from or written to the
RFID tag.
HS500E – OPERATOR’S MANUAL P/N: 17-1305 REV02 (12-05)
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