RFID Communications

After the controller sends the acknowledgment, it sends the read data from the two tags.

Field

Content

Header

0202H

 

 

Response Size

0005H

 

 

Command Echo/Tag 1

8DH

 

 

Data from Address 0001H

05H

 

 

Data from Address 0002H

AAH

 

 

Data from Address 0003H

21H

 

 

Data from Address 0004H

44H

 

 

Checksum

59H

 

 

Terminator

03H

 

 

Header

0202H

 

 

Response Size

0003H

 

 

Command Echo/Tag 2

8DH

 

 

Data from Address 0001H

05H

 

 

Data from Address 0002H

AAH

 

 

Data from Address 0003H

21H

 

 

Data from Address 0004H

44H

 

 

Checksum

59H

 

 

Terminator

03H

 

 

6.5.18 ABxF Command 91H: Memory Lock All

DESCRIPTION

Command 91H locks contiguous blocks of read-write memory. Once bytes are locked, they cannot be written to, nor can they be unlocked.

DISCUSSION

The memory can be locked only in contiguous blocks. The command passes one parameter for the first block, and another parameter for the number of blocks to be locked. This is one of only two ABx commands that address the memory of the tag using these parameters. The block structure of the tags is governed by the ISO-15693 specification. ABx command 15H can be used to obtain the memory organization for a particular tag. Attempting to write to locked bytes returns a Write Security Error.

Field

Content

Header

0202H

 

 

Command Size

Command length in bytes excluding the header, command size, checksum, and terminator bytes.

 

07H for this command.

 

 

Command

91H

 

 

Family Code

Tag Family ID - 00H = all tags

 

 

Reserved

Ignored byte, set to 00H

 

 

Timeout

Timeout value given in 1 ms units

 

 

Starting Block

First block of memory to be locked

 

 

Number of Blocks

Number of blocks that will be locked

 

 

Checksum

Optional checksum

 

 

Message Terminator

03H

 

 

LRP2000 Passive Reader/Writer

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Escort LRP2000 manual ABxF Command 91H Memory Lock All, 114