Excavating
Patent
1991-02-20
1994-06-28
Atkinson, Charles E.
Excavating
371 55, 371 70, G06F 1100
Patent
active
053253760
ABSTRACT:
A communication system includes a main control unit controlling a plurality of units, a transmitter for transmitting information between the main control unit and the plurality of units, and an error detector. The error detector can include a modulator and demodulator for modulating or demodulating the transmitted information on the basis of a predetermined rule. The error detector detects a communication error in the transmitted information in accordance with the predetermined rule. Alternatively, the error detector can include a transmitted data creator/analyzer for creating data based on the transmitted information in a state in which the information contains positive data and negative data of the same bit in one frame and analyzes data when the data is received. This error detector detects a communication error in the transmitted information on the basis of the comparison between the positive and negative data. The error detector can also include a space bit addition separator for creating data based on the transmitted information in a state in which a predetermined space bit is added in one frame and separates the space bit when the data is received. This error detector detects a communication error in the transmitted information on the basis of the timing at which the space bit and other bits appear.
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Matsuo Shimpei
Noguchi Akio
Serizawa Yoji
Takeuchi Makoto
Uchiyama Seiji
Atkinson Charles E.
Canon Kabushiki Kaisha
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