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RFID Communications
LRP2000 Passive Reader/Writer
72
6.4.12 ABxS Command 84H: Fill Tag All
DESCRIPTION
Command 84H fills all RFID tags-in-field or all tags in the same family, 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. All tags within range of the antenna with the specified Family ID
are affected by this command. The fill function requires one data value byte, a starting address, and a fill
length. It then fills the tag with the data value byte, starting at the specified start address for the specified
number of consecutive bytes. The fill length must be set to a non-zero value. The timeout value is given in
1 ms increments and can have a value of 001EH to FFFEH (65,534 ms). The controller returns a response
after the timeout expires. A response is returned when a successful operation is performed or when the
timeout has expired. When the timeout is set to 0, the controller returns a syntax error.
A response to a successful command follows this form:
Example
Writes 'A' (41H) to all tags of family 01H, starting at tag address 0005H for the following next consecutive
40 bytes with four to eight tags expected in the field. A timeout of 2 seconds (07D0H = 2000 x 1 ms
increments) is set for the completion of the Fill All Tag. Four tags are successfully filled within the timeout.
Field Remarks
Command Command number in hex preceded by AAH
Family Code Tag Family ID - 00H = all tags
Reserved Byte 00H
Start Address Tag address where the fill will start
Fill Length Number of tag addresses to be filled (1-48)
Timeout Timeout value given in 1 ms units (001EH - FFFEH)
Data Value Byte Byte to be used as fill
Message Terminator FFFFH
Field Remarks
Command Echo Command number in hex preceded by AAH
Number of Tags Filled Number of tags found in the field and filled
Command Status One byte error status
Message Terminator FFFFH
Command from Host Response from Controller
MSB LSB Remarks MSB LSB Remarks
AAH 84H Perform Command 84 AAH 84H Command Echo
01H 00H Tag Family 01 / Reserved 04H 08H Ntag/Status
00H 05H Start Address FFH FFH Message Terminator
00H 28H Fill Length
07H D0H 2-second Timeout
00H 41H Fill Byte
FFH FFH Message Terminator