METHOD AND CIRCUIT FOR SIGNAL TRANSMISSION VIA A CURRENT LOOP

Title:

METHOD AND CIRCUIT FOR SIGNAL TRANSMISSION VIA A CURRENT LOOP

Document Type and Number:

WIPO Patent Application WO/2010/108924

Kind Code:

A3

Abstract:

The invention relates to a method for signal transmission between a first and a second system (S1, S2) that are interconnected by means of a current loop (L). A direct current signal is transmitted in a first frequency range (AB) and an alternating current signal in a second frequency range (DB) via the current loop (L). The direct current signal and the alternating current signal are superimposed, the alternating current signal being used for digital signal transmission and the direct current signal being used for analog signal transmission. A control unit (CPU) produces a first data flow (U1) in which the direct current signal and the alternating current signal to be adjusted in the control loop (L) are digitally encoded, the first data flow (U1) being transmitted to a current output circuit (S), and the transmitted first data flow (U1) being converted into a current signal by the current output circuit (S), the current signal consisting of the superimposed direct current signal and alternating current signal, or the current output circuit (S) converts the transmitted first data flow (U1) into the direct current signal and the alternating current signal. The current signal or the direct current signal and alternating current signal are adjusted in the current loop (L).

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Inventors:

HAASE BJOERN (DE)
MARINGER BERND (DE)

Application Number:

PCT/EP2010/053787

Publication Date:

April 14, 2011

Filing Date:

March 23, 2010

Export Citation:

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Assignee:

CONDUCTA ENDRESS & HAUSER (DE)
HAASE BJOERN (DE)
MARINGER BERND (DE)

International Classes:

H04L25/02

Foreign References:

US20050242979A1	2005-11-03
US6137827A	2000-10-24

Other References:

PRATT JR W A: "REMOTE MONITORING USING HART PROTOCOL", ADVANCES IN INSTRUMENTATION AND CONTROL, INSTRUMENT SOCIETY OF AMERICA, RESEARCH TRIANGLE PARK, US, vol. 50, no. PART 03, 1 October 1995 (1995-10-01), pages 993 - 1001, XP000540071, ISSN: 1054-0032

Attorney, Agent or Firm:

ANDRES, Angelika (PatServeColmarer Strasse 6, Weil am Rhein, DE)

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