Patent US3863220A successfully refreshed from Google Patents.
US3863220A
Expired / Lapsed
US
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Loop type data highway system for data transmission
Assignee: Hitachi Ltd
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Filing: 1972-12-07
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Granted: 1975-01-28
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Expires: 1992-12-07
Abstract
Abstract A loop type data highway system for data transmission in which a plurality of stations each including at least a series connection of a receiver, control gates and a transmitter are connected in series with one another by a single common bus to form a closed loop. Each of those stations comprises means for applying a request for occupying the common bus, means for confirming as to whether the common bus is idle and available, means for turning off the control gates thereby opening the loop after confirmation of the fact that the common bus is idle and available, means for delivering a priority code A peculiar to the specific station to the common bus through the transmitter, and means for comparing the priority code A with another priority code B received by the specific station for the purpose of determining the priority order. The specific station determines that it succeeds in occupying the common bus when A = B and fails to occupy the common bus when A NOTEQUAL B. The specific station determines that another station having a lower priority order than the specific station applies a request for occupying the common bus simultanaeously with the request from the specific station when A > B, and that another station having a higher priority order than the specific station applies a request for occupying the common bus simultaneously with the request from the specific station when A < B.
Inventors
- 👤 Akira Osawa
- 👤 Hajime Yasuda
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-22 21:51
CPC Classifications
H; H04; H04L; H04L12/00; H04L12/28; H04L12/42; H04L12/427; H04L12/433; G; G06; G06F; G06F13/00; G06F13/14; G06F13/36; G06F13/368; G06F13/374
Claims Analysis
Total Claims: 19
Claim 1
Independent Claim
209 words
A looped highway system for data transmission comprising a plurality of stations connected in series through a common bus to form a closed loop in which data transmission between apparatuses connected to the stations is carried out through the corresponding statons, wherein each of said stations includes a receiver, a transmitter and a gate control device for controlling data transmission from said receiver and to said transmitter, means for applying to said gate control device a gate control signal upon detecting whether the common bus is occupied or not for data transmission from any of the apparatuses, means for transmitting a specific priority code prdetermined for each said station through said transmitter to the common bus, said specific priority code being indicative of the priority order of each said station relative to the other stations connected in said closed loop, means for comparing the transmitted specific priority code with a priority code which is received by each said station, and means for permitting data transmission from the apparatus connected to each said station subsequently to the transmission of said specific priority code when the transmitted priority code is identical to the received priority code and the common bus is not occupied by any apparatus connected to the other stations.
Claim 2
Dependent Claim
209 words
A looped highway system for data transmission comprising a plurality of stations connected in series through a common bus to form a closed loop in which data transmission between apparatuses connected to the stations is carried out through the corresponding statons, wherein each of said stations includes a receiver, a transmitter and a gate control device for controlling data transmission from said receiver and to said transmitter, means for applying to said gate control device a gate control signal upon detecting whether the common bus is occupied or not for data transmission from any of the apparatuses, means for transmitting a specific priority code prdetermined for each said station through said transmitter to the common bus, said specific priority code being indicative of the priority order of each said station relative to the other stations connected in said closed loop, means for comparing the transmitted specific priority code with a priority code which is received by each said station, and means for permitting data transmission from the apparatus connected to each said station subsequently to the transmission of said specific priority code when the transmitted priority code is identical to the received priority code and the common bus is not occupied by any apparatus connected to the other stations.
Claim 3
Dependent Claim
53 words
A looped highway system as claimed in claim 1, wherein each said station further comprises means for causing said each station to operate in a wait mode where each said station is waiting for transmission of data when the received priority code indicates priority over that indicated by the transmitted specific priority code.
Claim 4
Dependent Claim
77 words
A looped highway system as claimed in claim 1, wherein each said station further comprises means for detecting the lapse of a predetermined time TR after detection of said specific priority code indicating priority over that indicated by said received priority code and means for repeating the transmission of the specific priority code from each said station to the common bus in response to the detection of said lapse of the time TR by said detecting means.
Claim 5
Dependent Claim
52 words
A looped highway system as claimed in claim 1, wherein said transmitter in each station transmits a signal having in addition to a data signal in the binary form of 1 and 0 and indicative of the data to be transmitted, a vacant signal indicative of no data signal to be transmitted.
Claim 6
Dependent Claim
53 words
A looped highway system as claimed in claim 2, wherein said transmitter in each said station transmits a signal having in addition to a data signal in the binary form of 1 and 0 and indicative of the data to be transmitted, a vacant signal indicative of no data signal to be transmitted.
Claim 7
Dependent Claim
53 words
A looped highway system as claimed iN claim 3, wherein said transmitter in each said station transmits a signal having in addition to a data signal in the binary form of 1 and 0 and indicative of the data to be transmitted, a vacant signal indicative of no data signal to be transmitted.
Claim 8
Dependent Claim
34 words
A looped highway system as claimed in claim 4, including means for providing the data signal by phase modulation of a predetermined frequency and means for providing said vacant signal with a different frequency.
Claim 9
Dependent Claim
62 words
A looped highway system as claimed in claim 1, wherein each said station further comprises means for detecting the fact that the common bus is not occupied by any of the stations when each said station has detected a vacant signal which indicates that there exists no data signal to be transmitted and continues for a time longer than a predetermined time.
Claim 10
Dependent Claim
87 words
A looped highway system as claimed in claim 1, wherein each said station further comprises means for transmitting a vacant signal indicative of no data signal to be transmitted for a time less than a predetermined time to the common bus thereby initializing the other stations when the transmitted specific priority code indicates priority over that indicated by the received priority code and when some error has been found in data signal received by said each station while the common bus is occupied by each said station.
Claim 11
Dependent Claim
104 words
A looped highway system as claimed in claim 1, wherein each said station further comprises means for transmitting a vacant signal indicative of no data signal to be transmitted subsequent to the data transmission from each said station, means for comparing the duration time TV of said vacant signal with a predetermined period of time TVS, means for initializing each said station thereby causing each said station to continue its receiving mode when the relation TV < or = TVS is established and means for releasing the common bus from occupation by each said station when the relation of TV > TVS is established.
Claim 12
Dependent Claim
105 words
A looped highway system as claimed in claim 4, wherein each said station further comprises means for transmitting a vacant signal indicative of no data signal to be transmitted subsequent to the data transmission from each said station, means for comparing the duration time TV of said vacant signal with a predetermined period of time TVS, means for initializing each said station thereby causing each said station to continue its receiving mode when the relation of TV < or = TVS is established and means for releasing the common bus from occupation by each said station when the relation of TV > TVS is established.
Claim 13
Dependent Claim
105 words
A looped highway system as claimed in claim 8, wherein each said station further comprises means for transmitting a vacant signal indicative of no data signal to be transmitted subsequent to the data transmission from each said station, means for comparing the duration time TV of said vacant signal with a predetermined period of time TVS, means for initializing each said station thereby causing each said station to continue its receiving mode when the relation of TV < or = TVS is established and means for releasing the common bus from occupation by each said station when the relation of TV > TVS is established.
Claim 14
Dependent Claim
65 words
A loop type data highway system as claimed in claim 1, further comprising abnormal detecting means for detecting abnormal conditions of each said station, and a bypass route provided for each station so that, in the event of occurrence of abnormal conditions in anyone of said stations, the faulty station can be disconnected from said common bus thereby preventing the entire system from undesirable shutdown.
Claim 15
Dependent Claim
65 words
A loop type data highway system as claimed in claim 2, further comprising abnormal detecting means for detecting abnormal conditions of each said staton, and a bypass routE provided for each station so that, in the event of occurrence of abnormal conditions in anyone of said stations, the faulty station can be disconnected from said common bus thereby preventing the entire system from undesirable shutdown.
Claim 16
Dependent Claim
65 words
A loop type data highway system as claimed in claim 3, further comprising abnormal detecting means for detecting abnormal conditions of each said station, and a bypass route provided for each station so that, in the event of occurrence of abnormal conditions in anyone of said stations, the faulty station can be disconnected from said common bus thereby preventing the entire system from undesirable shutdown.
Claim 17
Dependent Claim
83 words
A loop type data highway system as claimed in claim 1, further comprising means for providing a transmission format consisting of a train of normal and inverted codes, means for continuously carrying out a complementary coincidence check on such a transmission format in the receiving station, and all-1 signal generating means so that, when received data are normal, such data are returned intact to the transmitting station, while when the received data are abnormal, an all-1 signal is returned to the transmitting station.
Claim 18
Dependent Claim
83 words
A loop type data highway system as claimed in claim 2, further comprising means for providing a transmission format consisting of a train of normal and inverted codes, means for continuously carrying out a complementary coincidence check on such a transmission format in the receiving station, and all-1 signal generating means so that, when received data are normal, such data are returned intact to the transmitting station, while when the received data are abnormal, an all-1 signal is returned to the transmitting station.
Claim 19
Dependent Claim
83 words
A loop type data highway system as claimed in claim 3, further comprising means for providing a transmission format consisting of a train of normal and inverted codes, means for continuously carrying out a complementary coincidence check on such a transmission format in the receiving station, and all-1 signal generating means so that, when received data are normal, such data are returned intact to the transmitting station, while when the received data are abnormal an all-1 signal is returned to the transmitting station.
References Cited (Backward Citations)
US3639904A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1978-01-27 | 1978-07-29 | 1979-01-28 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1982-01-27 | 1982-07-29 | 1983-01-28 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1986-01-27 | 1986-07-29 | 1987-01-28 | $7700.00 | Window Closed / Lapsed |