US4415896A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Computer controlled energy monitoring system
Assignee: A Dec Inc
•
Filing: 1981-06-09
•
Granted: 1983-11-15
•
Expires: 2001-06-09
Abstract
Abstract Disclosed is a centralized data communications system incorporating a plurality of remote stations, each having a plurality of information channels associated therewith. A selected remote station and its associated information channels are tone addressed by a central station communicating with a group of remote stations over a respective communications channel. The remote stations may have a current sensor connected to one of the information channels for sending data corresponding to the amount of current sensed in an electrical path back to the central station upon being properly addressed. This data, together with data representative of the voltage on the monitored electrical path, is used by the central station to calculate energy consumption. The calculated energy consumption is retained at the central station and used for information and billing purposes. The central station may also send data to an addressed information channel at a remote station for controlling an operation thereat. The central station can also receive data from various parameter measuring sensors at a remote station, e.g. sensors measuring temperature, humidity, fluid flow, etc. which may be connected to other information channels and thus the system may be used as a general purpose data gathering or distributing communications system.
Inventors
- 👤 Marvin D. Allgood
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 05:51
CPC Classifications
H; H04; H04Q; H04Q9/00; H04Q9/14; H04Q9/16; G; G01; G01F; G01F1/00; G01F1/68; G01F1/684; G01R; G01R22/00; G01R22/06; G01R22/10; G01R22/061; G01R22/066; G01R35/00; G01R35/04
Claims Analysis
Total Claims: 86
Claim 1
Independent Claim
189 words
A data communications system comprising: at least one communications channel; at least one group of remote stations connected to a respective communications channel, each remote station comprising a plurality of information channels and tone addressable means for selectively connecting one of said plurality of information channels to a respectively communications channel, said tone addressable means comprising a tone detector for detecting clock tones on a respective communications channel, counting means for counting the number of clock tones detected, means for connecting one of said information channels to the respective communications channel in accordance with the number of clock tones which are counted, and means for enabling said connecting means only when the number of clock tones detected falls within a predetermined numerical range; a central station connected to each said communications channel and comprising means for sequentially supplying clock tones in common to each said communications channel to cause sequential connection of the information channels at said remote stations to a respective communications channel associated therewith, and means for transmitting a signal to or receiving a signal from an information channel which is connected to a respective communications channel.
Claim 2
Dependent Claim
189 words
A data communications system comprising: at least one communications channel; at least one group of remote stations connected to a respective communications channel, each remote station comprising a plurality of information channels and tone addressable means for selectively connecting one of said plurality of information channels to a respectively communications channel, said tone addressable means comprising a tone detector for detecting clock tones on a respective communications channel, counting means for counting the number of clock tones detected, means for connecting one of said information channels to the respective communications channel in accordance with the number of clock tones which are counted, and means for enabling said connecting means only when the number of clock tones detected falls within a predetermined numerical range; a central station connected to each said communications channel and comprising means for sequentially supplying clock tones in common to each said communications channel to cause sequential connection of the information channels at said remote stations to a respective communications channel associated therewith, and means for transmitting a signal to or receiving a signal from an information channel which is connected to a respective communications channel.
Claim 3
Dependent Claim
145 words
A data communications system as in claim 1, wherein said tone detector provides a clock signal upon the occurrence of each said clocking tone, said counting means comprises a first counter for counting the number of said clocking signals, said first counter providing a carry output signal when a predetermined number of clocking signals have been counted, said enabling means comprises means for presetting a predetermined remote station address, a second counter for counting the number of carry output signals and for providing an enable signal when said counted number of carry output signals is in a predetermined numerical relationship to said predetermined address, and said connecting means selectively connects one of said plurality of information channels to a respective communications channel in accordance with the number of clock signals counted by said first counter, said connecting means being rendered operative by said enable signal.
Claim 4
Dependent Claim
29 words
A data communications system as in claim 2, wherein said second counter provides said enable signal when said counter number of carry output signals numerically equals said predetermined address.
Claim 5
Dependent Claim
51 words
A data communications system as in claim 1, wherein at least one of said information channels has an electronic calibration component connected thereto which is selectively connected to a respective central communications channel by said connecting means when a predetermined number of clock signals have been counted by said counting means.
Claim 6
Dependent Claim
45 words
A data communications system as in claim 1, further comprising means at said remote stations coupled to a respective communications channel and responsive to a resetting tone thereon for providing reset signals to said counting means for resetting it to a predetermined operative counter state.
Claim 7
Dependent Claim
49 words
A data communication system as in claim 5, wherein said detecting means is responsive to a relatively short duration clocking tone on a said respective communications channel and said means for providing reset signals is responsive only to a relatively long duration resetting tone on said respective communications channel.
Claim 8
Dependent Claim
19 words
A data communications system as in claim 1, wherein said clocking tone is at a frequency of 100 Khz.
Claim 9
Dependent Claim
23 words
A data communications system as in claim 5, wherein said clocking tone and said resetting tone are at a frequency of 100 Khz.
Claim 10
Dependent Claim
40 words
A data communications system as in claim 2, wherein said means for detecting said clocking tone comprises a tuned filter having an output connected to the input of a one-shot multivibrator, the output of said multivibrator supplying said clocking signals.
Claim 11
Dependent Claim
55 words
A data communications system as in claim 5, wherein said means for providing reset signals comprises a tuned circuit and a timing circuit coupled to the output of the tuned circuit, said timing circuit producing an output signal only when a reset signal is applied to said tuned circuit for a predetermined period of time.
Claim 12
Dependent Claim
42 words
A data communication system as in claim 1 further comprising a power supply for supplying voltage to said tone detector, counting means, connecting means, and enabling means, said power supply deriving said voltage from tone signals present on said respective communications channel.
Claim 13
Dependent Claim
14 words
A data communications system as in claim 2, wherein said presetting means is programmable.
Claim 14
Dependent Claim
20 words
A data communications system as in claim 1, wherein said information channels and said respective communications channel are wire pairs.
Claim 15
Dependent Claim
25 words
A data communications system as in claim 13 further comprising a fuse in said communications channel at the entry thereof to each said remote station.
Claim 16
Dependent Claim
55 words
A data communications system as in claim 1 further comprising at least one parameter sensor connected to one of said information channels and wherein said central station further comprises means connected to said communications channel for measuring the output of said sensor during the time said one information channel is connected to said communications channel.
Claim 17
Dependent Claim
71 words
A data communications system as in claim 1 further comprising operative means at a remote station connected to one of said information channels which is responsive to a predetermined signal on said one information channel, and wherein said central station further comprises means connected to said communications channel for supplying said predetermined signal to said one information channel during the time said one information channel is connected to said communications channel.
Claim 18
Dependent Claim
18 words
A data communications system as in claim 16 wherein said predetermined signal is at least one instruction tone.
Claim 19
Dependent Claim
57 words
A data communicatins system as in claim 17 wherein said predetermined signal is one of a plurality of instruction tones and further comprising a programmable tone generator at said central station for generating one of said instruction tones, and a processor means for causing said programmable tone generator to generate a selected one of said instruction tones.
Claim 20
Dependent Claim
37 words
A data communications system as in claim 15, wherein said measuring means comprises an analog to digital converter means for converting said sensor output to a digital value and a processor means for storing said digital value.
Claim 21
Dependent Claim
42 words
A data communications system as in claim 19 further comprising means for combining a calibration signal obtained from said sensor under known conditions with said sensor output prior to the application of said sensor output to said analog to digital converter means.
Claim 22
Dependent Claim
44 words
A data communications system as in claim 19, wherein said sensor output is a changing resistance signal and further comprising means for converting said changing resistance to a changing voltage before the application of said sensor output to said analog to digital converter means.
Claim 23
Dependent Claim
55 words
A data communications system as in claim 21, wherein said converting means connects a voltage across the series connection of said sensor output and a resistor, said converter means being programmable by said processor means so that one of a plurality of possible voltage and resistor combinations is connected to the output of said sensor.
Claim 24
Dependent Claim
37 words
A data communications system as in claim 21, further comprising means for supplying a test voltage to the input of said analog to digital converter means, said processor means storing the digital value of said test voltage.
Claim 25
Dependent Claim
40 words
A data communications system as in claim 23, wherein said test voltage supplying means is programmable to supply one of a plurality of test voltages to said analog to digital converter means in accordance with instructions from said processor means.
Claim 26
Dependent Claim
163 words
A data communications system as in claim 1 further comprising: at least one current sensor at at least one of said remote stations having an output connected to an associated information channel, said current sensor measuring the flow of current through an electrical path; means at said central station for receiving the output of said current sensor during the period said associated information channel is coupled to a respective communications channel; and, means at said central station for computing the electrical power flowing through said electrical path, said computing means comprising: means for deriving a voltage corresponding to the voltage on said electrical path; means for multiplying a signal representative of said derived voltage by a signal representative of the output of said current sensor to provide a power value; a first analog to digital converter means for digitizing the power value output of said multiplying means; and, processor means for storing the digitized output of said first analog to digital converter means.
Claim 27
Dependent Claim
46 words
A data communications system as in claim 25 wherein said processor means stores a plurality of digitized output signals of said first analog to digital converter means for each cycle of voltage on said electrical path and sums said digitized output signals for each said cycle.
Claim 28
Dependent Claim
31 words
A data communications system as in claim 26, wherein said voltage deriving means is connected to and derives said voltage from a power distribution system supplying voltage to said electrical path.
Claim 29
Dependent Claim
65 words
A data communications system as in claim 26, wherein said power distribution system is a multi-phase distribution system having at least one set of multiple phase input power lines and said voltage deriving means comprises means connected to each phase power line for deriving a voltage therefrom and means for selectively applying one of the derived voltages from said power lines to said multiplying means.
Claim 30
Dependent Claim
29 words
A data communications system as in claim 28, wherein said means for selectively applying selects one of said derived voltages in accordance with instructions received from said processor means.
Claim 31
Dependent Claim
86 words
A data communications system as in claim 25 further comprising at least one line voltage sensor at at least one of said remote stations having an output connected to an associated information channel, said line voltage sensor supplying an output signal representative of the voltage on said electrical path, said voltage deriving means comprising means at said central station for receiving the output of said voltage sensor during the period said information channel associated with said line voltage sensor is conneced to a respective communications channel.
Claim 32
Dependent Claim
48 words
A data communications system as in claim 25, wherein said multiplying means includes a second analog to digital converter means for digitizing said signal representing derived voltage and a multiplier for multiplying said signal representative of the output of said current sensor by said digitized derived voltage signal.
Claim 33
Dependent Claim
47 words
A data communications system as in claim 25, wherein said multiplying means includes an automatic gain control circuit for amplifying said signal representing the output of said current sensor by an amount required to place the output of said multiplying means within a predetermined signal level range.
Claim 34
Dependent Claim
80 words
A data communications system as in claim 32, wherein said automatic gain control circuit comprises means for detecting whether the output of said multiplying means is within said predetermined signal level range, programmable amplifying means for amplifying said signal representing the output of said current sensor by a factor determined by a value programmed therein, and means for repeatedly altering said programmed value until said detector indicates the output of said multiplying means is within said predetermined signal level range.
Claim 35
Dependent Claim
72 words
A data communications system as in claim 33, wherein said altering means comprises a counter for counting a counting signal, means for repeatedly supplying a counting signal to said counter until said detector indicates the output of said multiplying means is within said predetermined signal level range, and, means for decoding the contents of said counter to form said programmed value and for supplying said programmed value to said programmable amplifying means.
Claim 36
Dependent Claim
43 words
A data communications system as in claim 34, further comprising means for supplying the output of said counter to said processor means when the output of said multiplying means is within said predetermined signal level range, said processor means storing said counter output.
Claim 37
Dependent Claim
37 words
A data communications system as in claim 25, wherein said processor means calculates from stored power value outputs of said multiplying means energy consumed through said electrical path and provides an output display of said energy consumption.
Claim 38
Dependent Claim
71 words
A data communications system as in claim 25, wherein said multiplying means produces an inherent D.C. offset voltage during operation and said multiplying means including a capacitor means which is periodically charged to said D.C. offset voltage prior to the performance of a multiplying operation by said multiplying means by a periodically operated charging means, the charge on said capacitor means offsetting said offset voltage during operation of said multiplying means.
Claim 39
Dependent Claim
24 words
A data communications system as in claim 35, wherein said charging means is periodically operated by said processor means to charge said capacitor means.
Claim 40
Dependent Claim
118 words
A data communications system as in claim 1, further comprising: a plurality of communications channels each having a respective group of remote stations associated therewith, each remote station of a group being able to connect an information channel thereof to a respective central communications channel in accordance with the number of detected clock tones which are counted by a counting means, said central station being coupled to said plurality of communications channels such that clock tones from said central station are sequentially applied to each of said communications channels in common, said central station further comprising means for transmitting a signal to or receiving a signal from an information channel connected to any one of said communications channels.
Claim 41
Dependent Claim
72 words
A data communications system as in claim 39, further comprising at least one signal path in said central station; and a signal path selector means for selectively connecting said signal path to one of said communications channels, said signal path selector means comprising: a plurality of input lines respectively connected to said plurality of communications channels, and a programmable line selector for connecting one of said input lines to said signal path.
Claim 42
Dependent Claim
30 words
A data communications system as in claim 40, further comprising a processor means for instructing said programmable line selector to connect one of said input lines to said signal path.
Claim 43
Dependent Claim
86 words
A data communications system as in claim 41, wherein said programmable line selector has at least two switching sections, each associated with a respective group of input lines, each section selectively connecting one of the input lines associated therewith to a respective output line of the section, means for coupling the output lines of said sections to respective signal paths in said central station, said signal path selector further comprising means operable by said processor means for selectively coupling the output lines of said sections together.
Claim 44
Dependent Claim
17 words
A data communications system as in claim 25, wherein said current sensor output is a voltage signal.
Claim 45
Dependent Claim
36 words
A data communications system as in claim 25, further comprising means for supplying a test voltage to the current sensor input of said multiplying means, said processor means storing the digital value of said test voltage.
Claim 46
Dependent Claim
40 words
A data communications system as in claim 44, wherein said test voltage supplying means is programmable to supply one of a plurality of test voltages to said analog to digital converter means in accordance with instructions from said processor means.
Claim 47
Dependent Claim
60 words
A data communications system as in claim 26, wherein said processor means controls said first analog to digital converter means to digitize the power value output of said multiplying means and to store the digitized values by means of an interrupt program which is executed by said processor means in response to receipt of a first periodically generated interrupt signal.
Claim 48
Dependent Claim
31 words
A data communications system as in claim 46, wherein said periodically generated interrupt signal is generated by a frequency multiplier which is phase locked to the frequency of said derived voltage.
Claim 49
Dependent Claim
71 words
A data communications system as in claim 47, wherein said voltage deriving means is connected to and derives said voltage from a power distribution system supplying voltage to said electrical path, said power distribution system being a multi-phase distribution system having at least one set of multiple phase input power lines, said data communicating system further comprising means for selectively connecting one of said input power lines to said frequency multiplier.
Claim 50
Dependent Claim
141 words
A data communication system as in claim 15 further comprising a first temperature sensor connected to a first of said information channels and located so as to be affected by the flow of fluid in a flow path, a second temperature sensor connected to a second of said information channels and located so as to be effected by said flow of fluid and downstream of said first temperature sensor, and said central station further comprising a processor means for receiving output signals from said first and second temperature sensors, said processor means forming a difference value from the outputs of said first and second temperature sensors, said processor means storing a table of fluid flow rates verses temperature difference values for said temperature sensors and determining a fluid flow rate by looking up a determined temperature difference value in said table.
Claim 51
Dependent Claim
36 words
A data communication system as in claim 49 wherein said processor means further stores calibration data relating to said temperature sensors which is combined with the output signals of said sensors in forming said difference value.
Claim 52
Dependent Claim
16 words
A data communications system as in claim 15, wherein said parameter sensor is a temperature sensor.
Claim 53
Dependent Claim
17 words
A data communication system as in claim 15, wherein said parameter sensor is an electrical current sensor.
Claim 54
Dependent Claim
16 words
A data communications system as in claim 15, wherein said parameter sensor is a humidity sensor.
Claim 55
Dependent Claim
47 words
A data communications system as in claim 49, wherein said second temperature sensor comprises a temperature sensing device having an output signal which varies in accordance with a sensed temperature, a resistor thermally bonded to said temperature sensing device, and a voltage source connected across said resistor.
Claim 56
Dependent Claim
40 words
A data communications system as in claim 54, wherein said resistor and temperature sensing device are bonded together by a highly conductive material which forms a housing surrounding at least a portion of said resistor and said temperature sensing device.
Claim 57
Dependent Claim
15 words
A data communications system as in claim 55, wherein said housing has an oval shape.
Claim 58
Dependent Claim
27 words
A data communications system as in claim 55, wherein said second temperature sensor further comprises a metal layer surrounding said resistor, temperature sensing device and material housing.
Claim 59
Dependent Claim
85 words
A data communications system as in claim 49, wherein said fluid flow path is on the input side of a heat exchanging device and wherein a third temperature sensor is connected to a third information channel and is located so as to be affected by said flow of fluid as it exits from said heat exchanging device, said processor means further determining a BTU rate for said heat exchanging device from said determined flow rate and the outputs of said first and third temperature sensors.
Claim 60
Dependent Claim
47 words
A data communications system as in claim 51, wherein said central station further comprises means for comparing the output signal of said temperature sensor at different points in time and for issuing an alarm signal if the difference between the compared output signals exceeds a predetermined value.
Claim 61
Dependent Claim
210 words
A data communications system comprising: at least one central communications channel; at least one group of remote stations connected to a respective communications channel, each remote station comprising a plurality of information channels, addressable means for selectively connecting an addressed one of said plurality of information channels to said central communications channel, and at least one current sensor having an output connected to an associated information channel, said current sensor measuring the flow of current through an electrical path; a central station connected to each said central communications channel and comprising means for selectively addressing the information channels at said remote stations, means for receiving the output of said current sensor during the period said associated information channel is connected to a respective communications channel; and means for computing the electrical power flowing through said electrical path, said computing means comprising: means for deriving a voltage corresponding to the voltage on said electrical path; means for multiplying a signal representative of said derived voltage by a signal representative of the output of said current sensor to provide a power value; a first analog to digital converter means for digitizing the power value output of said multiplying means; and processor means for storing the digitized output of said first converter means.
Claim 62
Dependent Claim
210 words
A data communications system comprising: at least one central communications channel; at least one group of remote stations connected to a respective communications channel, each remote station comprising a plurality of information channels, addressable means for selectively connecting an addressed one of said plurality of information channels to said central communications channel, and at least one current sensor having an output connected to an associated information channel, said current sensor measuring the flow of current through an electrical path; a central station connected to each said central communications channel and comprising means for selectively addressing the information channels at said remote stations, means for receiving the output of said current sensor during the period said associated information channel is connected to a respective communications channel; and means for computing the electrical power flowing through said electrical path, said computing means comprising: means for deriving a voltage corresponding to the voltage on said electrical path; means for multiplying a signal representative of said derived voltage by a signal representative of the output of said current sensor to provide a power value; a first analog to digital converter means for digitizing the power value output of said multiplying means; and processor means for storing the digitized output of said first converter means.
Claim 63
Dependent Claim
48 words
A data communications system as in claim 60 further comprising means for combining a calibration signal obtained from said multiplying means under known conditions with the output of said multiplying means prior to application of the output of said multiplying means to said analog to digital converter means.
Claim 64
Dependent Claim
46 words
A data communications system as in claim 60, wherein said processor means stores a plurality of digitized output signals of said first analog to digital converter means for each cycle of voltage on said electrical path and sums said digitized output signals for each said cycle.
Claim 65
Dependent Claim
31 words
A data communications system as in claim 60, wherein said voltage deriving means is connected to and derives said voltage from a power distribution system supplying voltage to said electrical path.
Claim 66
Dependent Claim
65 words
A data communications system as in claim 63, wherein said power distribution system is a multi-phase distribution system having at least one set of multiple phase input power lines and said voltage deriving means comprising means connected to each phase power line for deriving a voltage therefrom and means for selectively applying one of the derived voltages from said power lines to said multiplying means.
Claim 67
Dependent Claim
29 words
A data communications system as in claim 64, wherein said means for selectively applying selects one of said derived voltages in accordance with instructions received from said processor means.
Claim 68
Dependent Claim
99 words
A data communications system as in claim 62, further comprising at least one line voltage sensor at at least one of said remote stations and having an output connected to an associated addressable information channel, said line voltage sensor supplying to a central communications channel when addressed by said central station an output signal representative of the voltage on said electrical path, said voltage deriving means comprising means at said central station for receiving the output of said voltage sensor during the period said information channel associated with said line voltage sensor is connected to a respective communications channel.
Claim 69
Dependent Claim
76 words
A data communications system as in claim 66, wherein said voltage deriving means further comprising means connected to and deriving voltage from a power distribution system supplying voltage to said electrical path, and means for selecting between a voltage derived from said power distribution system and a voltage corresponding to the output received from said line voltage sensor, the output of said selecting means supplying said signal representative of a derived voltage to said multiplying means.
Claim 70
Dependent Claim
25 words
A data communications system as in claim 67, wherein said voltage selecting means performs said selection in response to instructions received from said processor means.
Claim 71
Dependent Claim
48 words
A data communications system as in claim 60, wherein said multiplying means comprises a second analog to digital converter means for digitizing said signal representing derived voltage and a multiplier for multiplying said signal representative of the output of said current sensor by said digitized derived voltage signal.
Claim 72
Dependent Claim
47 words
A data communications system as in claim 60, wherein said multiplying means includes an automatic gain control circuit for amplifying said signal representing the output of said current sensor by an amount required to place the output of said multiplying means within a predetermined signal level range.
Claim 73
Dependent Claim
81 words
A data communications system as in claim 70, wherein said automatic gain control circuit comprises means for detecting whether the output of said multiplying means is within said predetermined signal level range, programmable amplifying means for amplifying said signal representing the output of said sensor by a factor determined by a value programmed therein, and means for repeatedly altering said programmed value until said detecting means indicates that the output of said multiplying means is within said predetermined signal level range.
Claim 74
Dependent Claim
71 words
A data communications system as in claim 71, wherein said altering means comprises a counter for counting a counting signal, means for repeatedly supplying a counting signal to said counter until said detector indicates the output of said multiplying means is within said predetermined signal level range, and means for decoding the contents of said counter to form said programmed value and supplying said programmed value to said programmable amplifying means.
Claim 75
Dependent Claim
43 words
A data communications system as in claim 72, further comprising means for supplying the output of said counter to said processor means when the output of said multiplying means is within said predetermined signal level range, said processor means storing said counter output.
Claim 76
Dependent Claim
37 words
A data communications system as in claim 60, wherein said processor means calculates from stored power value outputs of said multiplying means energy consumed through said electrical path and provides an output display of said energy consumption.
Claim 77
Dependent Claim
71 words
A data communications system as in claim 60, wherein said multiplying means produces an inherent D.C. offset voltage during operation, said multiplying means further comprising a capacitor means which is periodically charged to said D.C. offset voltage prior to the performance of a multiplying operation by said multiplying means by a periodically operated charging means, the charge on said capacitor means offsetting said offset voltage during operation of said multiplying means.
Claim 78
Dependent Claim
24 words
A data communications system as in claim 75, wherein said charging means is periodically operated by said processor means to charge said capacitor means.
Claim 79
Dependent Claim
36 words
A data communications system as in claim 60, further comprising means for supplying a test voltage to the derived voltage input of said multiplying means, said processor means storing the digital value of said test voltage.
Claim 80
Dependent Claim
40 words
A data communication system as in claim 77, wherein said test voltage supplying means is programmable to supply one of a plurality of test voltage to said analog to digital converter means in accordance with instructions from said processor means.
Claim 81
Dependent Claim
72 words
A data communications system as in claim 60, further comprising at least one signal path in said central station; and a signal path selector means for selectively connecting said signal path to one of said communications channels, said signal path selector means comprising: a plurality of input lines respectively connected to said plurality of communications channels, and a programmable line selector for connecting one of said input lines to said signal path.
Claim 82
Dependent Claim
30 words
A data communications system as in claim 79, further comprising a processor means for instructing said programmable line selector to connect one of said input lines to said signal path.
Claim 83
Dependent Claim
86 words
A data communication system as in claim 80, wherein said programmable line selector has at least two switching sections, each associated with a respective group of input lines, each section selectively connecting one of the input lines associated therewith to a respective ouput line of the section, means for coupling the output lines of said sections to respective signal paths in said central station, said signal path selector further comprising means operable by said processor means for selectively coupling the output lines of said sections together.
Claim 84
Dependent Claim
60 words
A data communications system as in claim 60, wherein said processor means controls said first analog to digitial converter means to digitize the power value output of said multiplying means and to store the digitized values by means of an interrupt program which is executed by said processor means in response to receipt of a first periodically generated interrupt signal.
Claim 85
Dependent Claim
31 words
A data communications system as in claim 82, wherein said periodically generated interrupt signal is generated by a frequency multiplier which is phase locked to the frequency of said derived voltage.
Claim 86
Dependent Claim
71 words
A data communications system as in claim 83, wherein said voltage deriving means is connected to and derives said voltage from a power distribution system supplying voltage to said electrical path, said power distribution system being a multi-phase distribution system having at least one set of multiple phase input power lines, said data communicating system further comprising means for selectively connecting one of said input power lines to said frequency multiplier.
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| 3.5 Years (Year 4) | 1986-11-14 | 1987-05-16 | 1987-11-15 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1990-11-14 | 1991-05-16 | 1991-11-15 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1994-11-14 | 1995-05-16 | 1995-11-15 | $7700.00 | Window Closed / Lapsed |