0-9 | A | B | C | D | E | F | G | H | I | J | K | L | M | N | O | P | Q | R | S | T | U | V | W | X | Y | Z
A digital code having two information states, e.g. , "0" and "1" or "mark" and "space", in which code the signal returns to a rest state during a portion of the bit period. (188)