HART® (Highway Addressable Remote Transducer) è un protocollo di comunicazione basato sullo standard di comunicazione telefonica Bell 202 e utilizza la modulazione FSK (frequency shift keying). Il segnale è costituito da due elementi, un segnale analogico in corrente 4-20mA e un segnale digitale a frequenza variabile sovrapposto. Normalmente il segnale analogico 4-20mA è utilizzato per il controllo e il segnale digitale sovrapposto, per le segnalazioni e per la configurazione. Il CVA utilizza i segnali in questo stesso modo. Il settaggio e le operazioni con il segnale 4-20 mA sono le stesse del controllo standard 4-20mA. La configurazione e i feedback si ottengono attraverso il segnale digitale HART®, connettendo l’host al CVA e selezionando i parametri richiesti.
La maggior parte delle impostazioni del CVA configurabili dall’utente possono essere effettuati attraverso il protocollo di comunicazione HART®. Inoltre, è possibile adattare i seguenti parametri HART®:
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