Patent US3633164A successfully refreshed from Google Patents.
US3633164A
Expired / Lapsed
US
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Data communication system for servicing two different types of remote terminal units over a single transmission line
Assignee: Unisys Corp
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Filing: 1969-11-28
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Granted: 1972-01-04
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Expires: 1989-11-28
Abstract
Abstract There is described a data communication system by which a processor may selectively poll two different types of terminal units at a remote station. Special characters in the polling message, when sensed at the sending station, switch the line adapter and control circuit of the sending station to transmit the polling message on the line in the required form for one or the other of the two types of terminal units. The data sets are arranged to transmit a control signal which operates a switch at the remote station to connect the designated type of terminal units to the line in response to the sensing of the particular special character associated with the polling message.
Inventors
- 👤 Donald P Hynes
- 👤 William H Clopton
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-30 21:05
CPC Classifications
H; H04; H04L; H04L5/00; H04L5/02; G; G06; G06F; G06F13/00; G06F13/14; G06F13/20; G06F13/22; G06F13/38; G06F13/382; G06F13/385
Claims Analysis
Total Claims: 4
Claim 1
Independent Claim
217 words
Apparatus transmitting digital data over a common transmission line to a remote station having two types of input/output units requiring two different data transmission modes from a single digital data source, comprising means at the source for storing a plurality of digitally coded characters, first control means for transferring digitally coded characters from said storing means to the transmission line in a first data transmission mode, means responsive to a predetermined digitally coded control character from said storing means for generating a control signal indicating a change to a second data transmission mode and including means interrupting transmission of said predetermined digitally coded control character to the remote station, switching means at the remote station for selectively connecting one or the other of two types of input/output units to the transmission line, means responsive to the control signal and coupled to the transmission line at the remote station for activating said switching means at the remote station to switch from one type of input/output unit to the other type, second control means for transferring digitally coded characters from said storing means to the transmission line in a second data transmission mode, and means responsive to said control signal for activating the second control means to transmit additional characters from the storing means in the second transmission mode.
Claim 2
Dependent Claim
217 words
Apparatus transmitting digital data over a common transmission line to a remote station having two types of input/output units requiring two different data transmission modes from a single digital data source, comprising means at the source for storing a plurality of digitally coded characters, first control means for transferring digitally coded characters from said storing means to the transmission line in a first data transmission mode, means responsive to a predetermined digitally coded control character from said storing means for generating a control signal indicating a change to a second data transmission mode and including means interrupting transmission of said predetermined digitally coded control character to the remote station, switching means at the remote station for selectively connecting one or the other of two types of input/output units to the transmission line, means responsive to the control signal and coupled to the transmission line at the remote station for activating said switching means at the remote station to switch from one type of input/output unit to the other type, second control means for transferring digitally coded characters from said storing means to the transmission line in a second data transmission mode, and means responsive to said control signal for activating the second control means to transmit additional characters from the storing means in the second transmission mode.
Claim 3
Dependent Claim
162 words
Apparatus for transmitting data to at least two different types of units at a remote station over a single transmission line wherein the two types of remote units require respectively data to be transmitted in distinct modes of transmission, comprising a buffer register control means coupling the digitally coded characters from the register to the transmission line in one oF two data transmission modes corresponding respectively to the two modes to which the two types of remote units respond, decoding means coupled to the register for decoding each character stored in the register, means responsive to the decoding means when a predetermined control character is present for switching the control means from one transmission mode to the other, means responsive to the decoding means for initiating a control signal over the transmission line to the remote station, and switching means at the remote station responsive to said control signal for switching from one type of unit to the other type of unit.
Claim 4
Dependent Claim
162 words
Apparatus for transmitting data to at least two different types of units at a remote station over a single transmission line wherein the two types of remote units require respectively data to be transmitted in distinct modes of transmission, comprising a buffer register control means coupling the digitally coded characters from the register to the transmission line in one oF two data transmission modes corresponding respectively to the two modes to which the two types of remote units respond, decoding means coupled to the register for decoding each character stored in the register, means responsive to the decoding means when a predetermined control character is present for switching the control means from one transmission mode to the other, means responsive to the decoding means for initiating a control signal over the transmission line to the remote station, and switching means at the remote station responsive to said control signal for switching from one type of unit to the other type of unit.
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) | 1975-01-03 | 1975-07-05 | 1976-01-04 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1979-01-03 | 1979-07-05 | 1980-01-04 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1983-01-03 | 1983-07-05 | 1984-01-04 | $7700.00 | Window Closed / Lapsed |