Method of and apparatus for detecting and circumventing malfunct

Details Method of and apparatus for detecting and circumventing malfunct Method of and apparatus for detecting and circumventing malfunct

1980-10-22

1982-07-20

Atkinson, Charles E.

Excavating

364184, 364473, G06F 1100

Patent

active

043409652

ABSTRACT:
In a communication system having a communication line with a plurality of ports to which electronic means are attached for transmitting and receiving sets of signals, a method of and apparatus for detecting a malfunction in a first electronic means associated with a first port of the plurality of ports and preventing such first electronic means from interfering with the operation of the remainder of the system when such malfunction occurs. The sets of signals comprise combinations of a first signal having a first magnitude and a second signal having a second magnitude, which is different than the first magnitude. In addition, the sets have a predetermined total number of first and second signals and always start with a second signal and end with a first signal. Each of the electronic means is adapted to provide a first signal when it is not transmitting a set of signals. The subject invention comprises: starting the timing of a predetermined period of time when the first electronic means transmits a second signal after a first signal; resetting the time period when the first electronic means transmits a first signal; inhibiting the transmission of signals transmitted by the first electronic means to the communication line if the predetermined period of time has elapsed; and providing a first signal to the communication line if the predetermined period of time has elapsed.

REFERENCES:
patent: 3396368 (1968-08-01), Lakhani
patent: 3587044 (1971-06-01), Jenkins
patent: 3779731 (1973-12-01), Pollock et al.
patent: 3810120 (1974-05-01), Huettner et al.
patent: 3919533 (1975-11-01), Einolf, Jr. et al.

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