User Manual Part 1

RFID Interface
58
LRP820S-Series Long-Range Passive Reader/Writers
The command and Response from the controller are
formatted as follows
Command Response
Field Remarks MSB LSB Remarks
Command Command number in hex
preceded by AAH
AAH 0DH Command
echo
Start
Address
2 byte value for the start
address in the tag
FFH FFH Message
Terminator
Read
Length
2 byte value for the block
read length
Delay
Between
Identical
Decodes
Time the tag must be out
of the antenna range
before the controller will
transmit data again from
that tag. Value is
expressed in 1 second
units.
Message
Terminator
FFFFH
Example
This example places the controller in Continuous Block Read mode
and reads 8 bytes of data from the tag starting at address 0001H. A
delay between identical reads of 2 seconds (0002H =2 x 1second
increments) is set.
Command from Host Response from controller
MSB LSB Remarks MSB LSB Remarks
AAH 0DH Perform Command D AAH 0DH Command echo
00H 01H Start address 00H 52H Read data byte 1
00H 08H Read 8 bytes 00H 46H Read data byte 2
00H 02H 2 second delay 00H 49H Read data byte 3
FFH FFH Message Terminator 00H 44H Read data byte 4
00H 41H Read data byte 5
00H 20H Read data byte 6
00H 54H Read data byte 7
00H 61H Read data byte 8
FFH FFH Message
Terminator