Communications: electrical – Continuously variable indicating – With meter reading
Patent
1983-01-10
1986-04-01
Yusko, Donald J.
Communications: electrical
Continuously variable indicating
With meter reading
340524, 34082536, 34087038, H04Q 900, G08B 2500
Patent
active
045801380
ABSTRACT:
Measurement-expressing apparatus for monitoring (n) switches, the state of each switch representing the state of a station, has a resistor in parallel with each switch, the (n) resistors having binary related resistances, a constant current is supplied to the parallel combinations of switches and resistors connected in series with each other, and signals each representative of the sum of the voltage drops within the series of parallel combinations are operated upon by an n-bit analogue-to-digital converter, the (n) outputs of the converter each being individually associated with a parallel combination, in each quantization period (t) of the converter, a signal is obtained on each converter output representative of one of the two possible states of the corresponding station, and signals of one form, provided on at least one output individually are accumulated in a counter over an interval (mt). The numbers accumulated by any counter in each of a plurality (p) of intervals (mt) are operated upon.
REFERENCES:
patent: 3922490 (1975-11-01), Pettis
patent: 4050062 (1977-09-01), Crocker et al.
patent: 4118700 (1978-10-01), Lenihan
patent: 4484290 (1984-11-01), Bagnall et al.
Ferranti plc
Yusko Donald J.
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