Method for identification of discrete baud rate of highway addressable remote transducer protocol for process plant instrumentation, involves using preamble phase to perform synchronization of baud rate of field device with transmitting end

The method involves communicating a field device (1) with a superordinate device (2) over an asynchronous serial link (3). A microcontroller is provided with universal asynchronous receiver transmitterinterfaces. The microcontroller is loaded with program implementing a state machine of highway addr...

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Bibliographic Details
Main Author TABELANDER, STEFAN
Format Patent
LanguageEnglish
German
Published 18.04.2013
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Summary:The method involves communicating a field device (1) with a superordinate device (2) over an asynchronous serial link (3). A microcontroller is provided with universal asynchronous receiver transmitterinterfaces. The microcontroller is loaded with program implementing a state machine of highway addressable remote transducer protocol. A state machine for baud rate identification is integrated with the state machine of the protocol. A preamble phase is used to perform synchronization of the baud rate of the field device with transmitting end. The superordinate device is designed as a personal computer. Die Erfindung betrifft ein Verfahren zur Baudratenerkennung für Feldgeräte (1), die über eine serielle Kommunikationsverbindung (3) mit einer übergeordneten Einrichtung (2) verbunden sind, die verschiedene Übertragungsgeschwindigkeiten zulassen. Es wird vorgeschlagen, die Zustandsmaschine der Baudratenerkennung in die Zustandsmaschine des HART-Protokolls zu integrieren und die Präambel-Phase zu verwenden, um eine Synchronisation der Baudrate des Feldgerätes (1) mit der Sendeseite (2) durchzuführen.
Bibliography:Application Number: DE201110115965