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RFID Communications
83 LRP2000 Passive Reader/Writer
6.4.21 ABxS Command 94H: SN Fill
DESCRIPTION
Command 94H fills only the RFID tag specified by the 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 is affected by this
command. The controller returns a response after the successful fill operation or when the timeout expires.
The fill function requires a Family ID and 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 writes fill data from the
start address to the end of the tag's memory. The timeout value is given in 1 ms increments and can have
a value of 001EH to FFFEH (65,534 ms). When the timeout is set to 0, the controller returns a syntax error.
It returns a response when done or when the timeout expires.
A response to a successful command follows this form:
Field Remarks
Command Command number in hex preceded by AAH
Family Code Tag Family ID - 00H = all tags
Reserved 00H
Start Address Tag address where the fill will start
Fill Length Number of tag addresses to be filled
Timeout Timeout value given in 1 ms units (001EH - FFFEH)
Tag Serial Number The 8-byte serial number
Data Value Byte The byte used to fill
Message Terminator FFFFH
Field Remarks
Command Echo Command number in hex preceded by AAH
Number of Tags filled 0 = tag not found, 1 = tag filled
Command Status One byte Error status
Message Terminator FFFFH