User Manual Part 2

RFID Interface
LRP2000 Long Range Passice Reader/Writer
87
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ABxS 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 48 bytes of data
transferred to the host with one command if there is no tag Family ID.
The timeout value is given in 1 msec increments and can have a value
of 001EH 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 a
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 error
message in the status byte. It returns a response when done or when
the timeout expires. The data read from the tag is returned in the LSB
of the register, and the MSB is always 00H. A special error packet
(AAH FFH) is sent if the timeout expires.
00H D0H SN byte 3
00H 27H SN
byte 4
00H
1CH SN byte
5
00H
65H SN byte
6
00H
33H SN byte
7
00H
41H Fill
byte
FFH FFH
Message
Terminator
Field Remarks
Command Command number in hex preceded
by AAH
Ta g Fa m i l y Tag Family ID - 00H = all tags
Command from host Response from controller
MSB LSB Remarks MSB LSB Remarks