US4806905A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Transmitter for transmitting on a two-wire transmitting line
Assignee: Honeywell Inc
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Filing: 1986-10-01
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Granted: 1989-02-21
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Expires: 2006-10-01
Abstract
Abstract A transmitter for repeatedly transmitting a measured value in the form of a digital signal through a two-wire transmission line, includes a receiving unit for receiving a digital command signal from a communicator through the two-wire transmission line, and a processor for sending out a response signal in response to the command signal upon reception thereof. The measured value is sent using a newest measured value after repetitive transmission of the measured value is interrupted. The measured value is transmitted from the transmitter by a change in current supplied to the two-wire transmission line, and reception of the command signal is performed by a change in interline voltage of the two-wire transmission line.
Inventors
- 👤 David L. McGowan, III
- 👤 Steven M. Oxenberg
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 23:49
CPC Classifications
G; G08; G08C; G08C19/00; G08C19/02
Claims Analysis
Total Claims: 18
Claim 1
Independent Claim
95 words
A transmitter for transmitting a measured value of a process variable in the form of a digital signal through a two-wire transmission line by a change in a current in the two-wire transmission line comprising means for receiving a digital command signal supplied through said two-wire transmission line and control means for adding the measured value to a digital response signal generated in response to the digital command signal and for transmitting a resultant digital signal so as to transmit on the two-wire transmission line at least one measured value within a predetermined time period.
Claim 2
Dependent Claim
95 words
A transmitter for transmitting a measured value of a process variable in the form of a digital signal through a two-wire transmission line by a change in a current in the two-wire transmission line comprising means for receiving a digital command signal supplied through said two-wire transmission line and control means for adding the measured value to a digital response signal generated in response to the digital command signal and for transmitting a resultant digital signal so as to transmit on the two-wire transmission line at least one measured value within a predetermined time period.
Claim 3
Dependent Claim
31 words
A transmitter according to claim 1 wherein the measured value is sent as a newest measured value after the transmission of the measured value is interrupted for said predetermined time period.
Claim 4
Dependent Claim
25 words
A transmitter according to claim 1 wherein the reception of the command signal utilizes a change in an interline voltage of said two-wire transmission line.
Claim 5
Dependent Claim
17 words
A transmitter according to claim 1 and including means for monitoring said predetermined period comprising a timer.
Claim 6
Dependent Claim
14 words
A transmitter according to claim 1 wherein said control means comprises a digital processor.
Claim 7
Dependent Claim
97 words
A transmitter for repeatedly transmitting a measured value of a process variable in the form of a digital signal through a two-wire transmission line by a change in a current in the two-wire transmission line comprising means for receiving a digital command signal supplied through said two-wire transmission line and control means for adding the measured value to a digital response signal generated in response to the digital command signal and for repeatedly transmitting a resultant digital signal so as to transmit on the two-wire transmission line at least one measured value within a predetermined time period.
Claim 8
Dependent Claim
97 words
A transmitter for repeatedly transmitting a measured value of a process variable in the form of a digital signal through a two-wire transmission line by a change in a current in the two-wire transmission line comprising means for receiving a digital command signal supplied through said two-wire transmission line and control means for adding the measured value to a digital response signal generated in response to the digital command signal and for repeatedly transmitting a resultant digital signal so as to transmit on the two-wire transmission line at least one measured value within a predetermined time period.
Claim 9
Dependent Claim
32 words
A transmitter according to claim 6 wherein the measured value is sent as a newest measured value after the repetitive transmission of the measured value is interrupted for said predetermined time period.
Claim 10
Dependent Claim
25 words
A transmitter according to claim 6 wherein the reception of the command signal utilize a change in an interline voltage of said two-wire transmission line.
Claim 11
Dependent Claim
17 words
A transmitter according to claim 6 and including means for monitoring said predetermined period comprising a timer.
Claim 12
Dependent Claim
14 words
A transmitter according to claim 6 wherein said control means comprises a digital processor.
Claim 13
Dependent Claim
99 words
A transmitter for transmitting a measured value of a process variable in the form of a digital through a two-wire transmission line by a change in a current in the two-wire transmission line comprising means for receiving a digital command signal supplied through said two-wire transmission line, means for digitally transmitting on said transmission at least one measured value of the process variable within a predetermined time period and control means for adding the measured value to a response signal generated in response to the digital command signal and for transmitting a resultant digital signal on said transmission line.
Claim 14
Dependent Claim
99 words
A transmitter for transmitting a measured value of a process variable in the form of a digital through a two-wire transmission line by a change in a current in the two-wire transmission line comprising means for receiving a digital command signal supplied through said two-wire transmission line, means for digitally transmitting on said transmission at least one measured value of the process variable within a predetermined time period and control means for adding the measured value to a response signal generated in response to the digital command signal and for transmitting a resultant digital signal on said transmission line.
Claim 15
Dependent Claim
31 words
A transmitter according to claim 11 wherein the measured value is sent as a newest measured value after the transmission of the measured value is interrupted for said predetermined time period.
Claim 16
Dependent Claim
25 words
A transmitter according to claim 11 wherein the reception of the command signal utilizes a change in an interline voltage of said two-wire transmission line.
Claim 17
Dependent Claim
17 words
A transmitter according to claim 11 and including means for monitoring a predetermined period comprising said time.
Claim 18
Dependent Claim
14 words
A transmitter according to claim 11 wherein said control means comprises a digital processor.
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) | 1992-02-21 | 1992-08-22 | 1993-02-21 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1996-02-21 | 1996-08-22 | 1997-02-21 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2000-02-21 | 2000-08-22 | 2001-02-21 | $7700.00 | Window Closed / Lapsed |