RFID Communications

LRP2000 Passive Reader/Writer 74

Example
Reads four bytes of data from the tag starting at address 0001H. A timeout of 2 seconds (07D0H = 2000 x 1 ms increments) is set for the completion of the Read All. The Family ID byte is set to zero, so all tags are read. Three tags respond with read data.
Command from Host Response from Controller
MSB LSB Remarks MSB LSB Remarks
AAH 85H Perform Command 85 AAH 85H Command Echo/Tag 1
00H 02H Tag Family 00/ Index 2 00H 30H Data byte 1/Tag 1
00H 01H Start Address 00H 31H Data byte 2/Tag 1
00H 04H Read Length 00H 32H Data byte 3/Tag 1
07H D0H 2-second Timeout 00H 33H Data byte 4/Tag 1
FFH FFH Message Terminator FFH FFH Terminator/ Tag 1
AAH 85H Command Echo/Tag 2
00H 40H Data byte 1/Tag 2
00H 41H Data byte 2/Tag 2
00H 42H Data byte 3/Tag 2
00H 43H Data byte 4/Tag 2
FFH FFH Terminator/ Tag 2
AAH 85H Command Echo/Tag 3
00H 34H Data byte 1/Tag 3
00H 35H Databyte 2/Tag 3
00H 36H Data byte 3/Tag 3
00H 37H Data byte 4/Tag 3
FFH FFH Terminator/ Tag 3
AAH FFH Termination Packet
03H 08H Ntag/Status
FFH FFH Terminator Message