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RFID Communications
LRP2000 Passive Reader/Writer
60
6.4.1 ABxS Command 04H: Fill Tag
DESCRIPTION
Fill an RFID tag with a one-byte value over multiple contiguous addresses.
DISCUSSION
This command is commonly used to clear contiguous segments of a tag's memory. It writes a one-byte
value repetitively across a specified range of tag addresses. The fill function requires one data value byte,
a starting address, and a fill length. It fills 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 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.
Example
The goal is to write ASCII 'A' (41H) to the ten bytes of tag memory starting at byte address 5. A timeout of
2 seconds (07D0H = 2000 x 1 ms increments) is set for the completion of the command.
Field Remarks
Command Command number in hex preceded by AAH
Start Address Tag address where the fill starts
Fill Length Number of tag addresses to be filled in bytes
Timeout Timeout value given in 1 ms units (1EH - FFFEH)
Data Value Byte Byte to be used as fill
Message Terminator FFFFH
Command from Host Successful Response From Controller
MSB LSB Remarks MSB LSB Remarks
AAH 04H Perform Command 4 AAH 04H Command Echo
00H 05H Start Address = 0005H FFH FFH Message Terminator
00H 0AH Fill Length= 10 bytes(000AH)
07H D0H 2-second Timeout
00H 41H Data Value Byte = 41H
FFH FFH Message Terminator