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ABxS Command 5 (05H): Block Read
DESCRIPTION
Read a block of data from an 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 48 bytes 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 LRP830 will return a syntax error.
The Block Read command consists of a start address and length, followed
by the message terminator, FFFFH, as shown below. If the read range ex
-
ceeds the last tag address, the LRP830 will return error message 21H, in
-
valid format.
The data read from the tag is returned in the LSB of the register, and the
MSB is always 00H.
Field Remarks
Command Command number in hex preceded by AAH
Start Address The tag address where the read will start
Read Length The number of tag addresses to be read
Timeout Timeout value given in 1 ms units (1EH - FFFEH)
Message Terminator FFFFH
Copyright © 2000 Escort Memory Systems
LRP830-Series Long-Range Passive Reader/Writer
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