Patent US3828313A successfully refreshed from Google Patents.
US3828313A
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Method and apparatus for data transmission
Assignee: American Multiplex Systems Inc
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Filing: 1972-09-12
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Granted: 1974-08-06
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Expires: 1992-09-12
Abstract
Abstract Method and apparatus for multiplex data transmission wherein binary address messages in a first waveform are transmitted from a central station through a data line to a plurality of remote terminals and binary response messages indicating the status of parameter points at the remote terminal are transmitted in a second waveform from the remote terminals through the same data line to the central station or other remote terminals. Remote receiver means are provided for differentiating between the two binary message waveforms. A clock signal is generated at the central station for transmission through a clock line to the remote terminals to provide synchronous circuit operation and a power supply for the remote terminals.
Inventors
- 👤 R Schull
- 👤 R Ichinose
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-22 20:08
CPC Classifications
H; H04; H04Q; H04Q9/00; H04Q9/14
Claims Analysis
Total Claims: 23
Claim 1
Independent Claim
198 words
Apparatus for time division multiplex data transmission between a plurality of remote terminals and a central station, including in combination: central generating means in said central station for generating different binary address messages each identifying at least one remote terminal and being generated in a first encoded binary waveform; remote generating means in each of said remote terminals for generating binary response messages upon receipt of their own binary address message, said binary response messages being generated in a second encoded binary waveform different from said first encoded binary waveform; transmission means for connecting said central station independently with each of said remote terminals including a single data line simultaneously carrying said binary address messages to all of said remote terminals and carrying said binary response messages to said central station; and discriminator means in each of said remote terminals including a plurality of clock signals which are out of phase relative to each other for differentiating between said first encoded waveform of said binary address messages coming from said central generating means in said central station and said second encoded waveform of said binary response messages coming from said remote generating means in said remote terminals, respectively.
Claim 2
Dependent Claim
198 words
Apparatus for time division multiplex data transmission between a plurality of remote terminals and a central station, including in combination: central generating means in said central station for generating different binary address messages each identifying at least one remote terminal and being generated in a first encoded binary waveform; remote generating means in each of said remote terminals for generating binary response messages upon receipt of their own binary address message, said binary response messages being generated in a second encoded binary waveform different from said first encoded binary waveform; transmission means for connecting said central station independently with each of said remote terminals including a single data line simultaneously carrying said binary address messages to all of said remote terminals and carrying said binary response messages to said central station; and discriminator means in each of said remote terminals including a plurality of clock signals which are out of phase relative to each other for differentiating between said first encoded waveform of said binary address messages coming from said central generating means in said central station and said second encoded waveform of said binary response messages coming from said remote generating means in said remote terminals, respectively.
Claim 3
Dependent Claim
65 words
The apparatus of claim 1 including means in said central station for generating a clock signal corresponding to said binary address message, and wherein said transmission means includes a clock line separate from said data line, said clock line carrying said clock signal to said remote terminals to enable synchronous circuit operation at said remote terminals and to generate said plurality of out-of-phase clock signals.
Claim 4
Dependent Claim
41 words
The apparatus of claim 2 including means in each of said remote terminals connected to said clock line of said transmission means for converting said clock signal into a direct current power supply for logic circuit components in said remote terminals.
Claim 5
Dependent Claim
79 words
The apparatus of claim 2 including a phase clock generator in each of said remote terminals connected to said clock line of said transmission means for generating three out-of-phase clock signals, and remote receiver circuit means in each of said remote terminals connected to said data line and coupled to said phase clock generator for monitoring said data line to detect only binary messages in said first encoded waveform and to ignore binary messages in said second encoded waveform.
Claim 6
Dependent Claim
53 words
The apparatus of claim 1 including at least one remote terminal identified by a predetermined address and having circuit means connected to said data line for monitoring said data line to detect and receive binary response messages in said second encoded waveform generated by another remote terminal identified by the same predetermined address.
Claim 7
Dependent Claim
58 words
The apparatus of claim 1 including a single time-shared shift register means in each remote terminal and connected to said discriminator means and said remote generator means for identifying each remote terminal''s own binary address message, and for thereafter scaNning the status of a plurality of parameter points to obtain information for encoding into said binary response message.
Claim 8
Dependent Claim
216 words
Apparatus for time-division multiplex data transmission between a plurality of remote terminals and a central station as well as between certain of said remote terminals, including in combination: central generating means in said central station for generating binary address messages each identifying at least one remote terminal and being generated in a first encoded binary waveform and for generating a corresponding clock signal; remote receiving means in all of said remote terminals for detecting only binary address messages in said first encoded waveform; remote generating means in certain of said remote terminals for generating binary response messages upon receipt of their own binary address message, said binary response messages being generated in a second encoded binary waveform different from said first encoded binary waveform; remote response receiving means in certain of said remote terminals for detecting binary response messages in said second encoded waveform as generated by an identically addressed remote terminal; transmission means for connecting said central station with said remote terminals including a clock line for carrying said clock signal to said remote terminals to enable synchronous circuit operation at said remote terminals, and a data line for carrying said binary address messages to said remote terminals and for carrying said binary response messages to said central station and to said other remote terminals.
Claim 9
Dependent Claim
216 words
Apparatus for time-division multiplex data transmission between a plurality of remote terminals and a central station as well as between certain of said remote terminals, including in combination: central generating means in said central station for generating binary address messages each identifying at least one remote terminal and being generated in a first encoded binary waveform and for generating a corresponding clock signal; remote receiving means in all of said remote terminals for detecting only binary address messages in said first encoded waveform; remote generating means in certain of said remote terminals for generating binary response messages upon receipt of their own binary address message, said binary response messages being generated in a second encoded binary waveform different from said first encoded binary waveform; remote response receiving means in certain of said remote terminals for detecting binary response messages in said second encoded waveform as generated by an identically addressed remote terminal; transmission means for connecting said central station with said remote terminals including a clock line for carrying said clock signal to said remote terminals to enable synchronous circuit operation at said remote terminals, and a data line for carrying said binary address messages to said remote terminals and for carrying said binary response messages to said central station and to said other remote terminals.
Claim 10
Independent Claim
174 words
A method of data transmission by time-division multiplexing between a central station and a plurality of remote terminals each identified by a predetermined binary address including the steps of: generating a binary address message and a corresponding clock signal at the central station; transmitting the binary address message simultaneously to all of the remote terminals in a first pulse-coded binary waveform; transmitting the clock signal to all of the remote terminals; converting the incoming clock signal at each of the remote terminals into a plurality of out-of-phase clock signals; sensing the status of a plurality of parameter points in at least one of the addressed remote terminals; generating a binary response message identifying the status of the parameter points at the addressed remote terminal; transmitting the binary response message in a second pulse-coded binary waveform different from said first pulse-coded binary waveform to the central station and to each of the remote terminals; and using the out-of-phase clock signals to enable each remote terminal to distinguish between the first and second pulse-coded binary waveforms.
Claim 11
Independent Claim
174 words
A method of data transmission by time-division multiplexing between a central station and a plurality of remote terminals each identified by a predetermined binary address including the steps of: generating a binary address message and a corresponding clock signal at the central station; transmitting the binary address message simultaneously to all of the remote terminals in a first pulse-coded binary waveform; transmitting the clock signal to all of the remote terminals; converting the incoming clock signal at each of the remote terminals into a plurality of out-of-phase clock signals; sensing the status of a plurality of parameter points in at least one of the addressed remote terminals; generating a binary response message identifying the status of the parameter points at the addressed remote terminal; transmitting the binary response message in a second pulse-coded binary waveform different from said first pulse-coded binary waveform to the central station and to each of the remote terminals; and using the out-of-phase clock signals to enable each remote terminal to distinguish between the first and second pulse-coded binary waveforms.
Claim 12
Dependent Claim
43 words
The method of claim 8 wherein said transmitting of the binary address message and the binary response message includes time-sharing a common line independently connecting the central station with each of the remote terminals and independently connecting the remote terminals to each other.
Claim 13
Dependent Claim
35 words
The method of claim 8 wherein said last-mentioned transmitting step includes transmitting from the addressed remote terminal to the central station a verification frame as a terminal and independent portion of the binary response message.
Claim 14
Dependent Claim
59 words
The method of claim 8 wherein said first-mentioned generating step includes generating a random sequence of binary address messages for transmission to the remote terminals, each binary address message being generated after the central station has received the previous binary response message, and including continuously monitoring the random sequence of binary address messages at each of the remote terminals.
Claim 15
Dependent Claim
35 words
The method of claim 8 wherein said first-mentioned generating step includes encoding the binary address message into a biphase waveform and said last-mentioned generating step includes encoding the binary response message into a NRZ waveform.
Claim 16
Dependent Claim
44 words
ThE method of claim 8 wherein said sensing step includes time-sharing a single shift register at the addressed remote terminal for both detecting the binary address message and sequentially scanning the status of each of a plurality of parameter points at the addressed terminal.
Claim 17
Dependent Claim
33 words
The method of claim 8 wherein said last-mentioned using step includes using the out-of-phase clock signals to detect and receive the binary response message in at least one other identically addressed remote terminal.
Claim 18
Independent Claim
183 words
A method of data transmission between a central station and a plurality of remote terminals including the steps of: generating at the central station a binary address message in a waveform discernible by the remote terminals; time-sharing a shift register at the remote terminals to detect the binary address message and to sequentially scan the status of a plurality of parameter points at the addressed terminal; generating at the addressed terminal a binary response message identifying the status of the parameter points and in a waveform not discernible by the remote terminals; carrying the binary address message and binary response messages on a single time-shared data line; transmitting a clock signal to the remote terminals; converting the incoming clock signal at the remote terminals into a first clock signal, a second clock signal phase shifted 90* relative to the first clock signal, and a third clock signal phase shifted 90* in the same direction relative to the second clock signal; and applying the three out-of-phase clock signals to the binary address message and the binary response message to differentiate between their respective waveforms.
Claim 19
Independent Claim
183 words
A method of data transmission between a central station and a plurality of remote terminals including the steps of: generating at the central station a binary address message in a waveform discernible by the remote terminals; time-sharing a shift register at the remote terminals to detect the binary address message and to sequentially scan the status of a plurality of parameter points at the addressed terminal; generating at the addressed terminal a binary response message identifying the status of the parameter points and in a waveform not discernible by the remote terminals; carrying the binary address message and binary response messages on a single time-shared data line; transmitting a clock signal to the remote terminals; converting the incoming clock signal at the remote terminals into a first clock signal, a second clock signal phase shifted 90* relative to the first clock signal, and a third clock signal phase shifted 90* in the same direction relative to the second clock signal; and applying the three out-of-phase clock signals to the binary address message and the binary response message to differentiate between their respective waveforms.
Claim 20
Dependent Claim
136 words
Apparatus for transmitting binary data between a central station and a plurality of remote terminals including: a first time-shared transmission line connecting said central station with said remote terminals for carrying both binary address messages sent from the central station to the remote terminals and binary response messages sent from the remote terminals to the central station; a second transmission line separate from said first transmission line, connecting said central station with said remote terminals for carrying a clock signal corresponding to said binary address messages to said remote terminals; and reception means at each of said remote terminals and connected to said first transmission line for detecting said binary address messages and for ignoring said binary response messages, said reception means including clock means coupled to said second transmission for generating three out-of-phase clock signals.
Claim 21
Dependent Claim
136 words
Apparatus for transmitting binary data between a central station and a plurality of remote terminals including: a first time-shared transmission line connecting said central station with said remote terminals for carrying both binary address messages sent from the central station to the remote terminals and binary response messages sent from the remote terminals to the central station; a second transmission line separate from said first transmission line, connecting said central station with said remote terminals for carrying a clock signal corresponding to said binary address messages to said remote terminals; and reception means at each of said remote terminals and connected to said first transmission line for detecting said binary address messages and for ignoring said binary response messages, said reception means including clock means coupled to said second transmission for generating three out-of-phase clock signals.
Claim 22
Dependent Claim
26 words
The apparatus of claim 16 including a third ground line, separate from said first and second transmission lines, connecting said central station with said remote terminals.
Claim 23
Dependent Claim
32 words
The apparatus of claim 16 wherein said reception means at certain of said remote terminals includes circuit means for detecting and receiving binary response messages generated by an identically addressed remote terminal.
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) | 1977-08-05 | 1978-02-04 | 1978-08-06 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1981-08-05 | 1982-02-04 | 1982-08-06 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1985-08-05 | 1986-02-04 | 1986-08-06 | $7700.00 | Window Closed / Lapsed |