US3796994A
Expired / Lapsed
US
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Code communication system
Assignee: Edwards Co Inc
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Filing: 1971-06-24
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Granted: 1974-03-12
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Expires: 1991-06-24
Abstract
Abstract A code communication system for interrogating remote stations from a central station during successive communication cycles wherein a start at a remote station is effective when received at the central station to cause the central station to transmit in a superiority search mode. Cycle reset means is provided governed by a remote station having initiated a cycle by a start pulse for causing the communication system to reset for starting a new communication cycle whenever a bit of the code superiority address transmitted from the central station disagrees in character with the address code of the station having transmitted the start pulse. Such a restart causes the transmission of another cycle which has an address code bit changed in character for the last address bit transmitted in the prior cycle. In this way an address code is completed only for the most superior station having registered a start.
Inventors
- 👤 R Nuss
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-22 22:23
CPC Classifications
H; H04; H04Q; H04Q9/00; H04Q9/14; H04L; H04L12/00; H04L12/28; H04L12/40; H04L12/403
Claims Analysis
Total Claims: 20
Claim 1
Independent Claim
219 words
A code communication system including at least one communication channel for interrogating remote stations from a central station during a communication cycle in response to a start pulse communicated to the central station from one of the remote stations and with each of the remote stations having an individual station code assigned thereto and wherein the improvement comprises; a. transmitting means at the central station response to a start pulse communicated over the communication channel from the central office to the remote stations a most superior station search code, b. receiving means at each of the remote stations for receiving the search code transmitted by the transmitting means, c. cycle reset means governed by a remote station having initiated a cycle by transmitting a start pulse for causing the communication system to be reset to start a new communication cycle in response to the reception at that remote station of a search code bit that has a sense that disagrees with a corresponding station code bit assigned to that station, and d. means at the central station responsive to the reset means for activating the transmitting means to transmit another cycle including the same address code as transmitted during the previous cycle except that the sense is changed for the last search code bit transmitted during the previous cycle.
Claim 2
Dependent Claim
219 words
A code communication system including at least one communication channel for interrogating remote stations from a central station during a communication cycle in response to a start pulse communicated to the central station from one of the remote stations and with each of the remote stations having an individual station code assigned thereto and wherein the improvement comprises; a. transmitting means at the central station response to a start pulse communicated over the communication channel from the central office to the remote stations a most superior station search code, b. receiving means at each of the remote stations for receiving the search code transmitted by the transmitting means, c. cycle reset means governed by a remote station having initiated a cycle by transmitting a start pulse for causing the communication system to be reset to start a new communication cycle in response to the reception at that remote station of a search code bit that has a sense that disagrees with a corresponding station code bit assigned to that station, and d. means at the central station responsive to the reset means for activating the transmitting means to transmit another cycle including the same address code as transmitted during the previous cycle except that the sense is changed for the last search code bit transmitted during the previous cycle.
Claim 3
Dependent Claim
42 words
A code communication system according to claim 1, and including mode selecting means for selectively enabling the transmitting means in a first mode to transmit successive roll call addresses and in a second mode to transmit a most superior station search code.
Claim 4
Dependent Claim
40 words
A code communication system according to claim 2 wherein the mode selecting means enables the transmission of a most superior station search code in the second mode in response to the start pulse communicated from one of the remote stations.
Claim 5
Dependent Claim
38 words
A code communication system according to claim 3 wherein the mode selecting means enables the transmission of addresses in the first mode when no start pulse is received at the central station from one of the remote stations.
Claim 6
Dependent Claim
112 words
A code communication system according to claim 2 wherein: a. means is provided for comparing each address code transmitted from the central station during each roll call cycle with the address code received at the central station over a common communication channel from the remote station being interrogated during that cycle and for delivering a recycle output signal when the addresses compared are out of correspondence, and b. means is provided for transmitting a distinctive address code during successive roll call cycles from the central station to the remote stations except that the same address code that was transmitted during the prior cycle is transmitted in response to the recycle output signal.
Claim 7
Dependent Claim
24 words
A code communication system according to claim 4 and including limiting means for permitting the transmission of only a limited number of repeat cycles.
Claim 8
Dependent Claim
26 words
A code communication system according to claim 6 wherein the limiting means includes a trouble latch that delivers an output after transmission of a repeat cycle.
Claim 9
Dependent Claim
34 words
A code communication system according to claim 7 wherein the output of the trouble latch advances the roll call of the transmitting means to transmit the next distinctive address code in a predetermined order.
Claim 10
Dependent Claim
22 words
A code communication system according to claim 8 and including counting means for determining the order of transmission of roll call addresses.
Claim 11
Dependent Claim
25 words
A code communication system according to claim 4 and including alarm means responsive to the trouble signal for indicating the detection of a trouble condition.
Claim 12
Dependent Claim
28 words
A code communication system according to claim 7 and including alarm means that is activated by a trouble signal provided there is an output of the limiting means.
Claim 13
Dependent Claim
151 words
A code communication system according to claim 1 having means for selectively operating in roll call mode and in a code superiority address search mode and having means for sequentially selecting different station address codes for transmission over a communication channel from a central station and having: a. storage means for storing an address code for transmission to the remote stations, b. station counting means for counting roll call cycles of operation and operable when enabled to deliver digital outputs to the storage means in accordance with the station count accumulated, c. code setting means operable when enabled to set the storage means to a most superior search address code, and d. mode selecting means operable to select first and second modes in response to signals from a remote station for enabling the station counting and the code setting means, respectively, to govern the address code stored by the storage means.
Claim 14
Dependent Claim
29 words
A code communication system according to claim 12 wherein the code setting means is enabled only for a first cycle of operation of the system in said second mode.
Claim 15
Dependent Claim
53 words
A code communication system according to claim 13 wherein toggle gating means is provided that is operable when enabled to change the address stored by the storage means and including enabling means for enabling the toggle gating means in response to a control signal communicated over the communication channel to the central station.
Claim 16
Dependent Claim
49 words
A code communication system according to claim 14 wherein means is provided for rendering the toggle gating means effective to change only the bit which was the last bit transmitted of the address code transmitted during the next prior cycle of operation of the system in said second mode.
Claim 17
Dependent Claim
70 words
A code communication system according to claim 12 wherein answer-back checking means is provided for checking an address code received at a central station during a cycle against the address code transmitted during that cycle and including means responsive to the checking means for causing the station counting means to repeat a cycle during roll call when the address code received is out of correspondence with the address code transmitted.
Claim 18
Dependent Claim
27 words
A code communication system according to claim 16 and including means to limit the number of successive cycles during which the same station address can be transmitted.
Claim 19
Dependent Claim
73 words
A code communication system according to claim 12 wherein the mode selecting means is governed by signals communicated from the remote stations over the communication channel for selectively operating the system in said first mode if no start is registered at one of the remote stations and for operating the system in said second mode if a start is registered by communication of a signal over the communication channel from a remote station.
Claim 20
Dependent Claim
83 words
A code communication system according to claim 18 wherein means is provided for communicating a manifestation from a remote station having registered a start when the system is operating in said second mode and a bit of the address code received at that station is out of correspondence with an address assigned to that station, whereby the sensing of this manifestation at the central station resets the communication apparatus at an intermediate point in a cycle to initiate a new cycle of operation.
References Cited (Backward Citations)
No citation records indexed.
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1977-03-11 | 1977-09-10 | 1978-03-12 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1981-03-11 | 1981-09-10 | 1982-03-12 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1985-03-11 | 1985-09-10 | 1986-03-12 | $7700.00 | Window Closed / Lapsed |