US3720790A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Data transmitting system
Assignee: TE Connectivity Corp
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Filing: 1971-02-22
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Granted: 1973-03-13
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Expires: 1991-02-22
Abstract
Abstract The specification discloses a two conductor data transmission system linking a plurality of sending stations to a plurality of receiving stations. A master clock connected to the cable determines consecutive time periods each consisting of three consecutive intervals. The master clock holds the cable at one voltage during the first of each three intervals and at zero voltage during the third thereof and monitors the cable for voltage changes during the second one of the intervals. Each station has a counter which counts the first intervals and when a count designated to the respective station is reached the station is operatively connected to the cable to supply a voltage signal thereto during the respective second interval of the time period, or to receive a voltage signal therefrom.
Inventors
- 👤 G Watson
- 👤 A Hamond
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-22 22:28
CPC Classifications
G; G08; G08C; G08C15/00; G08C15/06; G08C15/12; H; H04; H04B; H04B14/00; H04B14/02; H04B14/026; H04L; H04L12/00; H04L12/28; H04L12/40; H04L12/403; H04L25/00; H04L25/38; H04L25/40; H04L25/49; H04L25/4902; H04L7/00; H04L7/04; H04L7/041; H04L7/044; H04L2012/40267
Claims Analysis
Total Claims: 20
Claim 1
Independent Claim
312 words
In a system for transmitting data and the like between a plurality of stations; a two conductor cable, first means including a master clock connected to said cable and operable for supplying chronologically spaced sync signals at a first voltage thereto and for dividing the time between said sync signals into consecutive time periods each consisting of three consecutive intervals, said first means supplying a first signal at said first voltage to said cable during each said first interval and supplying no signal to said cable during each said second interval and supplying a second signal at zero voltage to said cable during each said third interval, at least one receiving station and at least one sending station connected to said cable, each station including a counter adapted to reset in response to a sync signal and registering a count in response to each said first signal, each station comprising signal processing means having input means to receive voltage signals and output means to supply voltage signals, selector means in each station connected to the counter therein and adjustable for selecting at least one count corresponding to the time period assigned to the respective station, inhibiting means in each station under the control of said selector means and connected to said signal processing means and effective for inhibiting the output from the respective output means except on said selected count during which said inhibiting means is ineffective, the output means of said sending station being connected to said cable and being adapted for supplying zero going signals thereto during the second interval of the respective time period when the respective inhibiting means is ineffective, and the input means of said receiving station being connected to said cable and being responsive to zero going signals received therefrom during the second interval of the respective time period when the respective inhibiting means is ineffective.
Claim 2
Dependent Claim
312 words
In a system for transmitting data and the like between a plurality of stations; a two conductor cable, first means including a master clock connected to said cable and operable for supplying chronologically spaced sync signals at a first voltage thereto and for dividing the time between said sync signals into consecutive time periods each consisting of three consecutive intervals, said first means supplying a first signal at said first voltage to said cable during each said first interval and supplying no signal to said cable during each said second interval and supplying a second signal at zero voltage to said cable during each said third interval, at least one receiving station and at least one sending station connected to said cable, each station including a counter adapted to reset in response to a sync signal and registering a count in response to each said first signal, each station comprising signal processing means having input means to receive voltage signals and output means to supply voltage signals, selector means in each station connected to the counter therein and adjustable for selecting at least one count corresponding to the time period assigned to the respective station, inhibiting means in each station under the control of said selector means and connected to said signal processing means and effective for inhibiting the output from the respective output means except on said selected count during which said inhibiting means is ineffective, the output means of said sending station being connected to said cable and being adapted for supplying zero going signals thereto during the second interval of the respective time period when the respective inhibiting means is ineffective, and the input means of said receiving station being connected to said cable and being responsive to zero going signals received therefrom during the second interval of the respective time period when the respective inhibiting means is ineffective.
Claim 3
Dependent Claim
312 words
In a system for transmitting data and the like between a plurality of stations; a two conductor cable, first means including a master clock connected to said cable and operable for supplying chronologically spaced sync signals at a first voltage thereto and for dividing the time between said sync signals into consecutive time periods each consisting of three consecutive intervals, said first means supplying a first signal at said first voltage to said cable during each said first interval and supplying no signal to said cable during each said second interval and supplying a second signal at zero voltage to said cable during each said third interval, at least one receiving station and at least one sending station connected to said cable, each station including a counter adapted to reset in response to a sync signal and registering a count in response to each said first signal, each station comprising signal processing means having input means to receive voltage signals and output means to supply voltage signals, selector means in each station connected to the counter therein and adjustable for selecting at least one count corresponding to the time period assigned to the respective station, inhibiting means in each station under the control of said selector means and connected to said signal processing means and effective for inhibiting the output from the respective output means except on said selected count during which said inhibiting means is ineffective, the output means of said sending station being connected to said cable and being adapted for supplying zero going signals thereto during the second interval of the respective time period when the respective inhibiting means is ineffective, and the input means of said receiving station being connected to said cable and being responsive to zero going signals received therefrom during the second interval of the respective time period when the respective inhibiting means is ineffective.
Claim 4
Dependent Claim
312 words
In a system for transmitting data and the like between a plurality of stations; a two conductor cable, first means including a master clock connected to said cable and operable for supplying chronologically spaced sync signals at a first voltage thereto and for dividing the time between said sync signals into consecutive time periods each consisting of three consecutive intervals, said first means supplying a first signal at said first voltage to said cable during each said first interval and supplying no signal to said cable during each said second interval and supplying a second signal at zero voltage to said cable during each said third interval, at least one receiving station and at least one sending station connected to said cable, each station including a counter adapted to reset in response to a sync signal and registering a count in response to each said first signal, each station comprising signal processing means having input means to receive voltage signals and output means to supply voltage signals, selector means in each station connected to the counter therein and adjustable for selecting at least one count corresponding to the time period assigned to the respective station, inhibiting means in each station under the control of said selector means and connected to said signal processing means and effective for inhibiting the output from the respective output means except on said selected count during which said inhibiting means is ineffective, the output means of said sending station being connected to said cable and being adapted for supplying zero going signals thereto during the second interval of the respective time period when the respective inhibiting means is ineffective, and the input means of said receiving station being connected to said cable and being responsive to zero going signals received therefrom during the second interval of the respective time period when the respective inhibiting means is ineffective.
Claim 5
Dependent Claim
55 words
A system according to claim 1 in which said first means includes means operable for monitoring the cable voltage during each said second interval and operable in response a zero going change in cable voltage to supply a said second signal at zero voltage to said cable during the remainder of the respective second interval.
Claim 6
Dependent Claim
72 words
A system according to claim 1 in which said sync pulse is of longer duration than a said time period and each remote station includes counter resetting circuitry connected between the cable and the counter reset terminal means and operable for supplying a counter resetting signal to the reset terminal means of the respective counter only upon the supply thereto of a voltage signal of longer duration than a said time period.
Claim 7
Dependent Claim
37 words
A system according to claim 1 in which said zero going voltage signals are totally aBsent during a said second interval or are present throughout the said interval and are thus in the form of binary bits.
Claim 8
Dependent Claim
38 words
A system according to claim 1 in which said zero going voltage signals are in the form of width modulated pulses having a variable duration proportional to the analog values of data transmitted during a said second interval.
Claim 9
Dependent Claim
93 words
A system according to claim 1 in which the output means of said signal processing means of said receiving station comprises digital output means in the form of an output terminal of a flip-flop, a zero going voltage signal on said cable during the entirety of a said second interval developing input signal means for said flip-flop, means for supplying said first signals on said cable to said flip-flop as gating clock pulses, and said inhibiting means preventing the supply of said gating pulses to said flip-flop except on the said selected count.
Claim 10
Dependent Claim
52 words
A system according to claim 1 in which the output means of said signal processing means of said receiving station comprises analog output means, said signal processing means developing an output in conformity with zero going signals on said cable having a duration less than the entirety of a said second interval.
Claim 11
Dependent Claim
15 words
A system according to claim 1 in which one conductor of said cable is grounded.
Claim 12
Dependent Claim
21 words
A system according to claim 1 in which one conductor of said cable is grounded, and said first voltage is positive.
Claim 13
Dependent Claim
21 words
A system according to claim 1 in which one conductor of said cable is grounded, and said first voltage is negative.
Claim 14
Dependent Claim
19 words
A system according to claim 1 in which said first intervals are longer than said second and third intervals.
Claim 15
Dependent Claim
42 words
A system according to claim 1 in which said first means includes at least one slave clock interposed in said cable and tracking said master clock thereby to reduce the amount of cable reactance between a said station and a said clock.
Claim 16
Independent Claim
121 words
The method of transmitting data and the like between a plurality of stations by a two conductor cable which comprises; periodically supplying sync pulses to said cable, supplying a plurality of uniformly spaced first pulses at a first voltage to said cable between successive sync pulses, supplying second pulses at zero voltage to said cable immediately prior to said first pulses and leaving the cable free to receive signals in the interval between each said first pulse and the next following second pulse, supplying width modulated zero going data pulses to said cable during the said interval from sending station means distributed along the cable, and receiving said data pulses from the cable in receiving station means distributed along said cable.
Claim 17
Independent Claim
121 words
The method of transmitting data and the like between a plurality of stations by a two conductor cable which comprises; periodically supplying sync pulses to said cable, supplying a plurality of uniformly spaced first pulses at a first voltage to said cable between successive sync pulses, supplying second pulses at zero voltage to said cable immediately prior to said first pulses and leaving the cable free to receive signals in the interval between each said first pulse and the next following second pulse, supplying width modulated zero going data pulses to said cable during the said interval from sending station means distributed along the cable, and receiving said data pulses from the cable in receiving station means distributed along said cable.
Claim 18
Dependent Claim
50 words
The method according to claim 13 which includes counting said first pulses and releasing data pulses from a sending station to said cable and operatively receiving the data pulses in a receiving station only during the interval following the first pulse corresponding to a count assigned to the respective stations.
Claim 19
Dependent Claim
37 words
The method according to claim 14 which includes monitoring said cable during each said interval and supplying a said second pulse to said cable immediately upon the detection of a said zero going pulse on the cable.
Claim 20
Dependent Claim
32 words
The method according to claim 14 which includes assigning at least one respective count to each of a plurality of sending stations and the same said counts to the corresponding receiving stations.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1976-03-12 | 1976-09-11 | 1977-03-13 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-03-12 | 1980-09-11 | 1981-03-13 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-03-12 | 1984-09-11 | 1985-03-13 | $7700.00 | Window Closed / Lapsed |