Electrical transmission or interconnection systems – Personnel safety or limit control features – Interlock
Patent
1985-07-25
1987-08-25
Zazworsky, John
Electrical transmission or interconnection systems
Personnel safety or limit control features
Interlock
307236, 307311, 307475, H03K 5153
Patent
active
046894993
ABSTRACT:
An electronic circuit for interfacing a sensor of either current sourcing or current sinking type to a data bus requiring signals of predetermined characteristics, the circuit including first and second level comparators set to different reference levels so as to define a window between the reference levels at which neither comparator is actuated. A sensor input terminal is biased to a level between the reference levels of the comparators, but varies to a level outside the window in response to current flowing from or into the sensor terminal. The comparator output terminals are connected to an output circuit which produces a signal suitable for transmission on the data bus in response to actuation of either comparator.
REFERENCES:
patent: 3725795 (1973-04-01), Mesenhimer
patent: 4292552 (1981-09-01), Tanaka
patent: 4382198 (1983-05-01), Ishijima et al.
Honeywell Inc.
Rubow Charles L.
Zazworsky John
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