User Manual Part 2

RFID Interface
142
LRP820S-Series Long-Range Passive Reader/Writers
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ABxF Command 94H: SN Fill
DESCRIPTION
Fills only the RFID tag specified by serial number with a one byte
value over multiple contiguous addresses.
DISCUSSION
This command is commonly used to clear an RFID tag's memory. It
writes a one byte value repetitively across a specified range of tag
addresses. Only the tag with the specified serial number will be
affected by this command. The controller will return a response after
the successful fill operation or when the timeout expires. The fill
function requires a Serial Number, one data value byte, a starting
address, and a fill length. It fills the specified tag with the data value
byte, starting at the specified start address for the specified number of
consecutive bytes. When Fill Length is set to 0, the controller will write
fill data from the start address to the end of the tag's memory. The
timeout value is given in 1 msec increments and can have a value of
1EH to FFFEH (65,534 ms). When the timeout is set to 0, the
controller will return a syntax error. It returns a response when done or
when the timeout expires.
Field Content
Header 0202H
Command Size Command length in Bytes excluding the
header, command size, checksum and
terminator Bytes.
Command 94H
Family Code Ignored, set to 00H
Reserved Ignored, set to 00H
Start Address 2-Byte value for the starting tag address
Number of Bytes 2-Byte value for the length of the fill in
number of Bytes
Timeout Timeout value given in 1 ms units
Serial Number Serial Number of the tag to be addressed
Data Value Value to be written to all addressed bytes
Checksum Optional Checksum
Message Terminator 03H