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Patent US3728681A successfully refreshed from Google Patents.
US3728681A
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Data loop communication priority establishing apparatus
Assignee: Collins Radio Co
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Filing: 1972-01-06
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Granted: 1973-04-17
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Expires: 1992-01-06
Abstract
Abstract The method of configuring communication units, all of which are connected in series on a loop such that some units may take priority and communicate out of the logical sequential order. This is accomplished using a master unit and first and second sets of slave units. The slave units respond to poll requests. These polls may come either from the master or the previously responding slave unit. The master unit always sends a prepoll before a poll. The first set of slave units will respond to a prepoll or a poll and thus can take priority in transmitting messages. The second set of slaves will respond only to a poll, internally set a flag, and then transmit a poll to further slave units upon receipt of the next prepoll.
Inventors
- 👤 R Fuller
- 👤 G Phillips
- 👤 R Simone
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 18:20
CPC Classifications
H; H04; H04L; H04L5/00; H04L5/02; H04L12/00; H04L12/28; H04L12/46; H04L12/4637
Claims Analysis
Total Claims: 11
Claim 1
Independent Claim
106 words
The method of providing orderly data communication on a series connected data loop having a master station and a plurality of slave stations which slave stations may only send data messages upon receiving a poll signal comprising, the steps of: giving priority to data messages originating from said master station immediately after any pending data transaction; sending a prepoll signal around said loop from said master station after each data transaction; and changing the prepoll signal to a poll signal in the last station to respond to a poll signal so that the poll signal will be forwarded to the next succeeding station on the loop.
Claim 2
Independent Claim
106 words
The method of providing orderly data communication on a series connected data loop having a master station and a plurality of slave stations which slave stations may only send data messages upon receiving a poll signal comprising, the steps of: giving priority to data messages originating from said master station immediately after any pending data transaction; sending a prepoll signal around said loop from said master station after each data transaction; and changing the prepoll signal to a poll signal in the last station to respond to a poll signal so that the poll signal will be forwarded to the next succeeding station on the loop.
Claim 3
Dependent Claim
22 words
The method of claim 1 comprising the additional step of changing any prepoll signals received at said master station to poll signals.
Claim 4
Independent Claim
151 words
The method of providing orderly data communication on a series connected data loop having a master station and a plurality of slave stations wherein said slave stations comprise priority and non-priority units and further wherein said non-priority slave station units may only send data messages upon receiving a poll signal and wherein said priority slave station units may send data upon receiving either a prepoll signal or a poll signal comprising, the steps of: giving priority to data messages originating from said master station immediately after any pending data transaction; sending a prepoll signal around said loop from said master station after each data transaction; and changing the next received prepoll signal to a poll signal in any station responding to a poll signal in attempting to transmit a data message so that the non-priority stations are allowed to send data messages only in their serial connected order on the loop.
Claim 5
Independent Claim
151 words
The method of providing orderly data communication on a series connected data loop having a master station and a plurality of slave stations wherein said slave stations comprise priority and non-priority units and further wherein said non-priority slave station units may only send data messages upon receiving a poll signal and wherein said priority slave station units may send data upon receiving either a prepoll signal or a poll signal comprising, the steps of: giving priority to data messages originating from said master station immediately after any pending data transaction; sending a prepoll signal around said loop from said master station after each data transaction; and changing the next received prepoll signal to a poll signal in any station responding to a poll signal in attempting to transmit a data message so that the non-priority stations are allowed to send data messages only in their serial connected order on the loop.
Claim 6
Dependent Claim
107 words
Slave station apparatus for connection in a data transmission loop over which prepoll, poll and call and data messages are sent, said loop including a master control station, said slave station comprising, in combination: first means for detecting and distinguishing between received prepoll signals, poll signals, messages for the slave station, and messages for other stations; second means for acknowledging receipt of messages for the slave station; third means for sending messages upon receipt of a poll signal; and fourth means for sending a poll signal only in response to the prepoll signal immediately following a poll to which the slave station reacted by sending a message.
Claim 7
Dependent Claim
107 words
Slave station apparatus for connection in a data transmission loop over which prepoll, poll and call and data messages are sent, said loop including a master control station, said slave station comprising, in combination: first means for detecting and distinguishing between received prepoll signals, poll signals, messages for the slave station, and messages for other stations; second means for acknowledging receipt of messages for the slave station; third means for sending messages upon receipt of a poll signal; and fourth means for sending a poll signal only in response to the prepoll signal immediately following a poll to which the slave station reacted by sending a message.
Claim 8
Dependent Claim
38 words
Apparatus as claimed in claim 4 wherein said slave station permits unchanged passage therethrough of messages destined for other stations and wherein said third means includes means for also sending a message upon receipt of a prepoll signal.
Claim 9
Dependent Claim
100 words
Message transmission apparatus comprising, in combination: master means for transmitting and receiving messages, for transmitting prepoll signals after reception of each message when no messages are present for transmission, and for transmitting poll signals after reception of prepoll signals; a plurality of slave means, each for receiving messages, for transmitting messages only in response to received poll signals, and for changing the next received prepoll signal to a poll signal after transmission of a message in response to a received poll signal; and means for serially connecting said master means and said plurality of slave means in a closed loop.
Claim 10
Dependent Claim
100 words
Message transmission apparatus comprising, in combination: master means for transmitting and receiving messages, for transmitting prepoll signals after reception of each message when no messages are present for transmission, and for transmitting poll signals after reception of prepoll signals; a plurality of slave means, each for receiving messages, for transmitting messages only in response to received poll signals, and for changing the next received prepoll signal to a poll signal after transmission of a message in response to a received poll signal; and means for serially connecting said master means and said plurality of slave means in a closed loop.
Claim 11
Dependent Claim
36 words
Apparatus as claimed in claim 6 wherein: at least one of said plurality of slave means additionally responds to prepoll signals by transmitting messages on the closed loop and thereby has priority over other slave means.
References Cited (Backward Citations)
US3435416A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1976-04-16 | 1976-10-16 | 1977-04-17 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-04-16 | 1980-10-16 | 1981-04-17 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-04-16 | 1984-10-16 | 1985-04-17 | $7700.00 | Window Closed / Lapsed |