US3593290A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Round robin data station selective calling system
Assignee: WILLEMIJN HOUDSTERMAATSCHAPPIJ BV A CORP OF NETHERLANDS
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Filing: 1969-07-17
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Granted: 1971-07-13
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Expires: 1989-07-17
Abstract
Abstract A transmission path arranged in a ring is looped through successive party line data stations. Any station can send to the other stations by splitting the line loop thereat and connecting the station transmitter to the outgoing side of the loop. All station transmitters are started by a common poll code which is sequentially passed from station to station until a bidding station is reached. The sending station reinitiates the cycling of the poll code by generating the code and applying it to the loop at the termination of the message. One station is arranged to insure that one, and only one, poll code is cycling the loop. The station applies the poll code to the loop if the code does not cycle through after a predetermined interval of time and also periodically opens the line loop to purge the loop of all signals thereon.
Inventors
- 👤 Douglas A Kerr
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-22 17:52
CPC Classifications
H; H04; H04L; H04L12/00; H04L12/28; H04L12/42; H04L12/427; H04L12/433
Claims Analysis
Total Claims: 12
Claim 1
Independent Claim
128 words
In a data station selection system wherein a transmission line loop serially interconnects a plurality of data stations, each of the stations including means for passing data signals received over the incoming side of the line to the outgoing side of the line and further means effective when the station is bidding for opening the outgoing side of the line in response to a poll code data signal received over the incoming side of the line characterized in that the passing means also includes storing means for delaying data signals before passage thereof to the outgoing side of the line for an interval of time sufficient to permit the further means to open the outgoing side of the line before the poll code data signal is passed thereto.
Claim 2
Dependent Claim
128 words
In a data station selection system wherein a transmission line loop serially interconnects a plurality of data stations, each of the stations including means for passing data signals received over the incoming side of the line to the outgoing side of the line and further means effective when the station is bidding for opening the outgoing side of the line in response to a poll code data signal received over the incoming side of the line characterized in that the passing means also includes storing means for delaying data signals before passage thereof to the outgoing side of the line for an interval of time sufficient to permit the further means to open the outgoing side of the line before the poll code data signal is passed thereto.
Claim 3
Dependent Claim
43 words
In a data station selection system in accordance with claim 1 wherein each station also includes data message transmission means operated in response to the furthEr means for sending a data message to the outgoing side of the line upon the opening thereof.
Claim 4
Dependent Claim
50 words
In a data station selection system in accordance with claim 2 wherein a poll code data signal transmission means responds to the data message transmission means at the termination of the sending of the data message by sending the poll code data signal to the outgoing side of the line.
Claim 5
Dependent Claim
47 words
In a data station selection system in accordance with claim 1 wherein at least one of the stations includes purge means for periodically opening the outgoing side of the line for a duration of time corresponding to the round trip propagation time of the transmission line loop.
Claim 6
Dependent Claim
67 words
In a data station selection system in accordance with claim 4 wherein the purge means includes means for applying a predetermined code signal to the outgoing side of the line upon the opening thereof and means responsive to the reception of the predetermined code signal from the incoming side of the line for terminating the opening of the outgoing side of the line by the purge means.
Claim 7
Dependent Claim
51 words
In a data station selection system in accordance with claim 4 wherein a poll code data signal transmission means responds to the termination of the opening of the outgoing side of the line by the purge means for sending the poll code data signal to the outgoing side of the line.
Claim 8
Dependent Claim
58 words
In a data station selection system in accordance with claim 1 wherein a poll code data signal transmission means operates in the absence of reception of the poll code data signal over the incoming side of the line for a predetermined interval of time to send the poll code data signal to the outgoing side of the line.
Claim 9
Dependent Claim
113 words
In a data station selection system wherein a transmission line is looped through successive stations, each of said stations including an arrangement which is effective when the station is bidding for seizing the line loop in response to a poll code received over the incoming side of the loop and further including, storing means, included in the line loop at each station, for storing the poll code received from the loop, means for opening the outgoing side of the loop when the station seizes the line loop to discard the poll code, and means for repeating the stored poll code to the outgoing side of the loop when the station is not bidding.
Claim 10
Dependent Claim
113 words
In a data station selection system wherein a transmission line is looped through successive stations, each of said stations including an arrangement which is effective when the station is bidding for seizing the line loop in response to a poll code received over the incoming side of the loop and further including, storing means, included in the line loop at each station, for storing the poll code received from the loop, means for opening the outgoing side of the loop when the station seizes the line loop to discard the poll code, and means for repeating the stored poll code to the outgoing side of the loop when the station is not bidding.
Claim 11
Dependent Claim
35 words
In a data station selection system in accordance with claim 8 wherein the seizing arrangement includes means responsive to the storage of the poll code in the storing means for initiating the line loop seizure.
Claim 12
Dependent Claim
38 words
In a data station selection system in accordance with claim 8 wherein the repeating means includes means responsive to the storage of the poll code in the storing means for initiating the repeating of the stored poll code.
References Cited (Backward Citations)
US3483329A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1974-07-12 | 1975-01-11 | 1975-07-13 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1978-07-12 | 1979-01-11 | 1979-07-13 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1982-07-12 | 1983-01-11 | 1983-07-13 | $7700.00 | Window Closed / Lapsed |