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Patent Agency Ranking
公开(公告)号：BR9206536A
公开(公告)日：1995-10-24
申请号：BR9206536
申请日：1992-08-20
Applicant: ROSEMOUNT INC
Inventor： ANDERSON STEPHEN D , FRICK ROGER L , MONZO GLEN E , WESTFIELD BRIAN L
Abstract: A three wire transmitter bidirectionally communicates AC signals to and from a first external device and sends DC signals to a second external device. The transmitter includes a communication circuit which is energized from power and common terminals and includes memory storage for transmitter status and a process variable (PV). The communication circuit receives a sensor output indicative of the PV and provides the DC signal and the AC signal to a signal terminal which connects to both external devices, and also receives AC signals from the first external device. The communications circuit has a characteristic AC impedance between the signal and common terminals over an AC frequency range for receiving and transmitting AC signals to and from the first external device so that the receiving signals are not shorted out and so the transmitted signals can be received. The communications circuit has a characteristic DC impedance between the signal and common terminals over a range of frequencies which include DC and typically extend to approximately 20 Hz. The characteristic impedance is substantially lower than the impedance of the second external device which receives DC signals so that the accuracy of the DC signal is not compromised.
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公开(公告)号：AU667682B2
公开(公告)日：1996-04-04
申请号：AU2543492
申请日：1992-08-20
Applicant: ROSEMOUNT INC
Inventor： ANDERSON STEPHEN D , FRICK ROGER L , MONZO GLEN E , WESTFIELD BRIAN L
Abstract: A three wire transmitter bidirectionally communicates AC signals to and from a first external device and sends DC signals to a second external device. The transmitter includes a communication circuit which is energized from power and common terminals and includes memory storage for transmitter status and a process variable (PV). The communication circuit receives a sensor output indicative of the PV and provides the DC signal and the AC signal to a signal terminal which connects to both external devices, and also receives AC signals from the first external device. The communications circuit has a characteristic AC impedance between the signal and common terminals over an AC frequency range for receiving and transmitting AC signals to and from the first external device so that the receiving signals are not shorted out and so the transmitted signals can be received. The communications circuit has a characteristic DC impedance between the signal and common terminals over a range of frequencies which include DC and typically extend to approximately 20 Hz. The characteristic impedance is substantially lower than the impedance of the second external device which receives DC signals so that the accuracy of the DC signal is not compromised.
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公开(公告)号：CA2119438A1
公开(公告)日：1993-04-01
申请号：CA2119438
申请日：1992-08-20
Applicant: ROSEMOUNT INC
Inventor： ANDERSON STEPHEN D , FRICK ROGER L , MONZO GLEN E , WESTFIELD BRIAN L
Abstract: A three wire transmitter bidirectionally communicates AC signals to and from a first external device and sends DC signals to a second external device. The transmitter includes a sensor circuit and a communication circuit, both energized from power and common terminals of the transmitter. The communication circuit receives a sensor output indicating a sensed process variable and provide DC and AC signals to a signal terminal which connects to both external devices, and also receives AC signals from the first external device. The DC signal is representative of the sensed process variable and the AC signal is digitally representative of the sensed process variable and of transmitter data selected by the received AC signal.
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公开(公告)号：MX9205174A
公开(公告)日：1993-03-01
申请号：MX9205174
申请日：1992-09-10
Applicant: ROSEMOUNT INC
Inventor： ANDERSON STEPHEN D , FRICK ROGER L , MONZO GLEN E , WESTFIELD BRIAN L
Abstract: A three wire transmitter bidirectionally communicates AC signals to and from a first external device and sends DC signals to a second external device. The transmitter includes a communication circuit which is energized from power and common terminals and includes memory storage for transmitter status and a process variable (PV). The communication circuit receives a sensor output indicative of the PV and provides the DC signal and the AC signal to a signal terminal which connects to both external devices, and also receives AC signals from the first external device. The communications circuit has a characteristic AC impedance between the signal and common terminals over an AC frequency range for receiving and transmitting AC signals to and from the first external device so that the receiving signals are not shorted out and so the transmitted signals can be received. The communications circuit has a characteristic DC impedance between the signal and common terminals over a range of frequencies which include DC and typically extend to approximately 20 Hz. The characteristic impedance is substantially lower than the impedance of the second external device which receives DC signals so that the accuracy of the DC signal is not compromised.
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公开(公告)号：EP0606260A4
公开(公告)日：1994-08-10
申请号：EP92919210
申请日：1992-08-20
Applicant: ROSEMOUNT INC
Inventor： ANDERSON STEPHEN D , FRICK ROGER L , MONZO GLEN E , WESTFIELD BRIAN L
CPC classification number: G08C19/02
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