Escort LRP2000 ABxS Command 84H Fill Tag All, Response to a successful command follows this form

RFID Communications

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.

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

A response to a successful command follows this form:

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

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.

Command from Host

MSB	LSB	Remarks
AAH	84H	Perform Command 84
01H	00H	Tag Family 01 / Reserved
00H	05H	Start Address
00H	28H	Fill Length
07H	D0H	2-second Timeout
00H	41H	Fill Byte
FFH	FFH	Message Terminator

Response from Controller

MSB	LSB	Remarks
AAH	84H	Command Echo
04H	08H	Ntag/Status
FFH	FFH	Message Terminator

LRP2000 Passive Reader/Writer 72