User Manual Part 2

RFID Interface
136
LRP820S-Series Long-Range Passive Reader/Writers
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ABxF Command 8EH: Memory Lock All
DESCRIPTION
This command 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 which 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 will return a Write Security Error.
The command is formatted as shown below.
Field Content
Header 0202H
Command Size Command length in Bytes excluding the
header,command size, checksum and terminator
Bytes. 07H for this command.
Command 8EH
Family Code Tag Family ID - 00H = all tags
Reserved Ignored, set to 00H
Timeout Timeout value given in 1 ms units
Starting Block First block of memory to be locked
Number of Blocks The number of blocks whose memory will be locked
Checksum Optional Checksum
Message Terminator 03H