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US3624295A
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Monitoring means for telegraph-type data-communications systems
Assignee: Pioneer Electric and Research Corp
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Filing: 1968-11-26
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Granted: 1971-11-30
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Expires: 1988-11-26
Abstract
Abstract In a telegraph-type data-communications system in which a plurality of data sending stations are polled sequentially by a master controller to transmit data, a monitor in the test room of the system supervises the activity of the controller. An absence of polling signals for a predetermined time is detected and reported visually and/or audibly via remote and local alarm means, as desired. The monitoring circuit is transistorized and functions with a sudden switching action at a stable operating point with relatively inexpensive components, notwithstanding the relatively long time constant (slow rate) of its timer.
Inventors
- 👤 Carl Norman Pederson
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-04 23:35
CPC Classifications
H; H04; H04L; H04L43/00; G; G06; G06F; G06F13/00; G06F13/14; G06F13/20; G06F13/22; H04L43/10
Claims Analysis
Total Claims: 10
Claim 1
Independent Claim
226 words
In a telegraph-type data-communication system having a plurality of stations selectively transmitting data to a master station upon request therefrom, monitoring and reporting means for detecting the absence of requests from the master station to said selected sending stations for data transmission and in response to such detection reporting such condition, said monitoring and reporting means comprising, detecting means responsive to interrogations of said stations from said master station for data transmission, said detecting means in the absence of such interrogations being actuated from a first condition to a second condition, timing means responsive to operation of said detecting means to said second condition for (initiating) timing (of) a predetermined interval, switching means responsive to (said timing) the approach of said timing means to the end of said predetermined interval for starting operation (switching) from a first switch condition to a second switch condition (at the expiration of a said predetermined interval), and indicating means responsive to switching of said switching means to said second switch condition for indicating said absence of interrogation for said predetermined interval, characterized in that: means are provided for sensing (the threshold) said starting operation of switching means to said second switch condition (of said switching means) for causing termination of said predetermined interval by said timing means and (''''snap'''') sudden actuation of said switching means to said second switched condition.
Claim 2
Dependent Claim
226 words
In a telegraph-type data-communication system having a plurality of stations selectively transmitting data to a master station upon request therefrom, monitoring and reporting means for detecting the absence of requests from the master station to said selected sending stations for data transmission and in response to such detection reporting such condition, said monitoring and reporting means comprising, detecting means responsive to interrogations of said stations from said master station for data transmission, said detecting means in the absence of such interrogations being actuated from a first condition to a second condition, timing means responsive to operation of said detecting means to said second condition for (initiating) timing (of) a predetermined interval, switching means responsive to (said timing) the approach of said timing means to the end of said predetermined interval for starting operation (switching) from a first switch condition to a second switch condition (at the expiration of a said predetermined interval), and indicating means responsive to switching of said switching means to said second switch condition for indicating said absence of interrogation for said predetermined interval, characterized in that: means are provided for sensing (the threshold) said starting operation of switching means to said second switch condition (of said switching means) for causing termination of said predetermined interval by said timing means and (''''snap'''') sudden actuation of said switching means to said second switched condition.
Claim 3
Dependent Claim
45 words
Monitoring and reporting means as set forth in claim 1 wherein, said detecting means respond to any interrogation from said master station by being actuated back to said first condition, said detecting means in said first condition positively resetting said timing means to zero timing.
Claim 4
Dependent Claim
72 words
In a telegraph-type data-communication system as set forth in claim 1 wherein said master station interrogates said sending stations selectively by coded combinations of mark and space signals, wherein said detecting means are actuated to said second condition by said mark signals for initiating timing by said timing means, and wherein said detecting means upon detecting a space signal are restored to said first condition for restoring said timing means to zero.
Claim 5
Dependent Claim
52 words
Monitoring and reporting means as set forth in claim 3 wherein said timing means comprise resistor-capacitor timing network means and, wherein said detecting means include a variable impedance responsive to detection of a space signal for placing a low-impedance shunt path across said capacitor of said timing network for discharging said capacitor.
Claim 6
Dependent Claim
45 words
Monitoring and reporting means as set forth in claim 4 wherein said variable impedance of said detecting means, under conditions where a mark signal is detected, removes said low-impedance shunt path across said timing capacitor for allowing charging of said capacitor to initiate said timing.
Claim 7
Dependent Claim
30 words
Monitoring and reporting means as set forth in claim 4 wherein said variable impedance means of said detecting means comprises a transistor with its emitter-collector path shunting said timing capacitor.
Claim 8
Dependent Claim
51 words
Monitoring and reporting means as set forth in claim 5 wherein said switching means comprise a pair of slaved transistors a first one of which, under conditions where said capacitor of said resistor-capacitor timing network attains a predetermined charge, becomes conducting, and wherein its said associated slaved transistor amplifies such conduction.
Claim 9
Dependent Claim
84 words
Monitoring and reporting means set forth in claim 7 wherein said threshold-sensing means comprise a transistor connected to said switching means for sensing the threshold of conduction of said first switching means transistor, said threshold-sensing transistor, upon sensing initiation of conduction of said first switching means transistor, being driven quickly to full conduction and being connected with its emitter-collector path shunting a portion of the resistance of the resistor-capacitor timing network for quickly charging said timing capacitor causing sudden conduction of said switching transistors.
Claim 10
Dependent Claim
44 words
Monitoring and reporting means set forth in claim 7 wherein, said indicating means comprise an electromagnetic relay connected for energization in the emitter-collector circuit of said second of said switching transistors, and wherein, alarm means are provided and energized by operation of said relay.
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) | 1974-11-29 | 1975-05-31 | 1975-11-30 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1978-11-29 | 1979-05-31 | 1979-11-30 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1982-11-29 | 1983-05-31 | 1983-11-30 | $7700.00 | Window Closed / Lapsed |