User Manual Part 2

RFID Interface
144
LRP820S-Series Long-Range Passive Reader/Writers
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ABxF Command 95H: SN Block Read
DESCRIPTION
Read a block of data from a specified RFID tag.
DISCUSSION
This command is used to read segments of data from contiguous
areas of tag memory. It is capable of handling up to 1 kByte of data
transferred to the host with one command. The timeout value is given
in 1 msec increments and can have a value of 1EH to FFFEH (65,534
ms). When the timeout is set to 0, the controller will return a syntax
error. The SN Block Read consists of Family ID and Serial Number a
start address and length, followed by a timeout value. The 8-byte
serial number of the target tag is specified. If the read length exceeds
the last tag address, the controller will return an error message in the
status byte. It returns a response when done or when the timeout
expires.
Field Content
Header 0202H
Command Size Command length in Bytes excluding the
header, command size, checksum and
terminator Bytes.
Command 95H
Family Code Ignored, set to 00H
Reserved Ignored, set to 00H
Start Address 2-Byte value for the starting tag address
Number of Bytes 2-Byte value for the length of the fill in
number of Bytes
Timeout Timeout value given in 1 ms units
Serial Number Serial Number of the tag to be addressed
Checksum Optional Checksum
Message Terminator 03H