User's Manual

Table Of Contents
ABxF Command 94 (94H): SN Fill
DESCRIPTION
Fill an RFID tag, identified 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.
The SN Fill command requires a specific serial number of the tag to be
filled. It will fill the 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 LRP820 will write fill data from the start address to the end of
the tags 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 LRP820 will return a syntax error.
Field Content
Header <STX><STX>
Command Size Packet length in bytes excluding the header, command size, checksum and
terminator bytes.
Command 94H
Family ID Tag Family ID - 00H = all tags
Anticollision Index Number of tags expected
Start Address 2-byte value for the starting tag address
Fill Length 2-byte value for the length of the fill in number of bytes
Timeout 2-byte value for timeout in 1 ms units. (1EH - FFFEH)
Tag Serial Number 8-byte tag serial number
Data value byte 1 byte of fill
Checksum Optional Checksum
Terminator <ETX>
Copyright © 2000 Escort Memory Systems
128 LRP820-Series Long-Range Passive Reader/Writer