Because of the varying
lengths of the codes for the characters
Morse code was
unsuitable for machine encoding and decoding. There was a great intrest in replacing the
human telegrap operators vith machines, and in the 1870's the
Baudot code was invented by a
Frenchman named
Emilie Baudot.
The
Baudot Code used the same number of signal elements (
bits) to represent each character, and was far better suited to machine encoding and decoding.
The five-bit code could generate only 32 possible combinations, not enough to represent the 26 characters of the
alphabet, the 10
decimal digits, etc. Therfore Baudot used two shift-control characters (1111 and 11011) to select one of the two
character sets each composed of 26 and 28 characters.
Code L F
11001 A -
10011 B ?
01110 C :
10010 D Who are you?
10000 E 3
10110 F Not allocated
01011 G Not allocated
00101 H Not allocated
01100 I 8
11010 J Bell
11110 K (
01001 L )
00111 M :
00110 N ,
00011 O 9
01101 P 0
11101 Q 1
01010 R 4
10100 S ,
11100 U 7
01111 V =
11001 W 2
10111 X /
10101 Y 6
10001 Z +
00000 BLANK
11111 Letters(L) shift
11011 Figures(F) SHift
00100 SPACE
00010 Carrage Return
01000 Line Feed