Specifications

ManualsBrandsInpeco ManualsComputers & AccessoriesRFID-Radio Frequency Identification Device for Sample Carriers

FL-MDS-CAB.2

MOD-MDS.1 ***Confidential*** 13 of 28

B10

B11

B12

B13

B14

B15

0xFF

0x5A

Id3

Id2

Id1

Id0

CRC1

Id3

Id2

Id1

Id0

CRC2

 Bytes 0-4 are all ones (can be used as synchronization preamble)

 0x5A in byte 5 is a marker (sync pattern) used to detect the start of the meaningful sequence

 Bytes 6-9 carry bytes 3-0 of the carrier unique Id, which is transmitted in MSB order

 Byte 10 contains CRC1, a cyclic redundancy check computed on bytes 5-9 (algorithm in Appendix)

 Bytes 11-14 contain a replica of the tag Id

 Byte 15 contains CRC2, computed with another algorithm on bytes 11-14 (algorithm in Appendix)

7.2.2 Rack tag encoding

The tag contents for a tube rack is outlined in the following table:

B10

B11

B12

B13

B14

B15

Id3

Id2

Id1

Id0

CRC2

0x55

Id3

Id2

Id1

Id0

CRC2

 Bytes 0-3 carry bytes 3-0 of the rack unique Id, which is transmitted in MSB order

 Byte 4 contains CRC2, computed with the CRC2 algorithm on bytes 0-3 (algorithm in Appendix)

 Bytes B0-B4 could contain the value 0x55 on some legacy racks

 Bytes 5-10 contain the value 0x55

 Bytes 11-14 contain bytes 3-0 of the rack unique Id, which is transmitted in MSB order

 Byte 15 contains CRC2, computed with the CRC2 algorithm on bytes 11-14 (algorithm in Appendix)

NOTE: The content always present is in bytes B5-B15 so the decoding will be performed on the second

copy of the meaningful content.

7.3 Signal encoding

The HITAG digital signal to the MCU encodes the information as time intervals between signal edges:

 1 is encoded by two edges separated by a 512 µs nominal interval (full-one-bit);

 0 is encoded by two double edges, separated by a 256 µs nominal interval (two half-zero-bits).

The signal is a threshold digitization of the analog antenna signal, so an interval tolerance is used to decide

if the measured time between signal edges is to be considered valid during decoding.

Example: if the interval tolerance is 30 µs, a valid half-zero interval duration is 256±30 µs, a valid full-one

interval duration is 512±30 µs. In practice: two edges separated by 203 µs will be considered unacceptable,

while two edges separated by 242 µs will be considered a valid half-zero-bit.