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Chapter 2 RFID PPI1 Commands
40
Read Tag
Purpose This command allows data from the RFID tag
(embedded in the smart label) to merge into any
previously defined dynamic data field. It is equivalent to
the Field Number command (^FN) except that the data
come from the RFID tag.
Format ^RT
x
,
start
,
length
,
hex
,
retries
,
motion
,
reserved
^RT Read Tag command.
x
Specified Field Number (value assigned
to the field). The default is 0. The
acceptable value range is 0 to 9999.
start
Location where data will be read from the
RFID tag. The PPI1 only supports Alien
Technology Class 1a tags, which have
only one 8–byte block. Therefore,
start
will be set to 0, regardless of the
specified value.
length
The number of blocks to be read from the
RFID tag. The PPI1 only supports Alien
Technology Class 1a tags, which have
only one 8–byte block. Therefore,
length
will be set to 1, regardless of the
specified value.
hex
This flag indicates whether the data, after
being read from the RFID tag, should be
translated into hexadecimal format. The
default is 0, meaning the data will not be
translated. The other acceptable value is
1, meaning the data will be translated
into hexadecimal format.
retries
The number of automatic attempts to
read data from the tag if previous reads
failed. The PPI1 absorbs the number and
uses the value on the control panel’s
LCD.