Coded data generation or conversion – Analog to or from digital conversion – Analog to digital conversion
Patent
1995-01-03
1998-01-06
Young, Brian K.
Coded data generation or conversion
Analog to or from digital conversion
Analog to digital conversion
H03M 100
Patent
active
057060070
ABSTRACT:
Protocol converter device converts between a 4-20 mA analog signal format and a digital Fieldbus signal format. An input circuit is provided, coupled to the transmitters which includes a multiplexer for selecting one of the analog signals from the transmitters of, e.g., three different field devices or from the analog signal converted from a digital signal. After the analog signal is converted to a digital signal, a central processing unit converts the converted digital signal into a digital quantity of a property of interest which may be display and/or transmitted to other devices or a control computer via a Fieldbus. The central processing unit selects which transmitter converted analog signal is to be displayed. The converter circuit can be placed in an environmental hazard resistant housing, to create a protocol conversion unit that can be located in a convenient field or control center location.
REFERENCES:
patent: 5558115 (1996-09-01), Lenz et al.
patent: 5563587 (1996-10-01), Harjani
Michael Babb, Control Engineering, "A Fieldbus First: New Transmitter Works With Two Protocols" (May 1994).
Fieldbus Foundation.TM., Fieldbus Specification, Function Block Application Process --Part 1, FF-94-890, Revision PS 1.0, Apr. 27, 1995.
Fieldbus Foundation.TM., Fieldbus Specification, Function Block Application Process --Part 2, FF-94-891, Revision PS 1.0, Apr. 27, 1995.
De Souza Libanio Carlos
Fragnito Carlos Roberto
Ginatto Luiz Antonio
Graton Marco Antonio
Guasti, Jr. Jose Guilherme
SMAR Research Corporation
Young Brian K.
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