Excavating
Patent
1980-08-20
1982-08-31
Atkinson, Charles E.
Excavating
G06F 1108, H04L 114
Patent
active
043476090
ABSTRACT:
A method and system for transmitting N-bit serial data (where N is a positive number) in the form of a bit serial, including a data sending circuit, a data receiving circuit and data transmission lines. The system includes a first data transmission line; a second transmission line; a transfer circuit, provided in the receiving means, for sending back to the data sending circuit through the second data transmission line, the bit content of received N-bit data each time one bit of the N-bit data is received through the first data transmission line; a comparison circuit, provided in the data sending circuit, for comparing the transmitted bit content and the bit content sent back on the second data transmission line; and a detection circuit provided in the data receiving circuit. The data sending circuit is adapted to transmit as a start bit a signal of a prescribed logical value before the N-bit serial data is sent, and, as an alarm bit, the results of the comparison after the N-bit serial data has been sent. The detection circuit detects whether the logical values of the start bit and the alarm bit are prescribed logical values, so that a transmission error or a break in a transmission line can be detected.
REFERENCES:
patent: 3453592 (1969-07-01), Ishii et al.
patent: 3805234 (1974-04-01), Masters
patent: 3868633 (1975-02-01), Nuese
patent: 3910322 (1975-10-01), Hardesty, Jr. et al.
patent: 4070648 (1978-01-01), Mergenthaler et al.
Fukuyama Hiroomi
Isobe Shin-ichi
Kataoka Minoru
Yonekura Mikio
Atkinson Charles E.
Fujitsu Fanuc Limited
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