RFID - EN Encoding information Encoding information J.-D. Chatelain.

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Presentation transcript:

RFID - EN Encoding information Encoding information J.-D. Chatelain

What does mean a number like 8604? RFID - EN Encoding information Almost whole Humanity today uses the same ten symbols called "Arabic numerals" and scored 0, 1, 2, 3, 4, 5, 6, 7, 8 and 9. Counting The ten symbols combined allow to represent any number that is said then expressed in base 10, or as decimal. What does mean a number like 8604? 8604 = 8 times 10 3 + 6 times 10 2 + 0 times 10 1 + 4 times 10 0 To represent numbers, men have first used the hand, which has led to the decimal base

What does mean a number like 1101? RFID - EN Encoding information 4 2 3 1 9 8 7 6 5 Imagine that instead of ten symbols, we do has only two, 0 and 1, called bits. Counting These two symbols, combined, can represent any number that is said then expressed in base 2, or in binary mode. What does mean a number like 1101? 1101 = 1 times 2 3 + 1 times 2 2 + 0 times 2 1 + 1 times 2 0 = 13 A binary numbering system is used in electronics because it is easy to determine whether a switch is open or closed.

What does mean a number like D3A? RFID - EN Encoding information 4 2 3 1 9 8 7 6 5 In computing, it has become customary to group the binary digits into words of eight bits or bytes Counting one byte A byte allows to encode 2 8 = 256 different values. It is unthinkable to use a different symbol for each of 256 combinations allowed. However, splitting the byte into two 4-bit words, each word can encode 2 4 = 16 combinations. It is conceivable to assign a symbol to each of the 16 different values: These symbols, combined, can represent any number that is said then expressed in base 16, or in hex mode What does mean a number like D3A? D3A = D(=13) times 16 2 + 3 times 16 1 + A(=10) times 16 0 = 3386

Example: encoding M: Hex Binary 4 D 0100 1101 RFID - EN Encoding information ASCII (American Standard Code for Information Interchange) used for encoding alphanumeric characters in computer Example: encoding M: Hex Binary 4 D 0100 1101

Encoding information End of this chapter J.-D. Chatelain RFID - EN