If a system uses tone transmission, which aspect carries the data?

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Study for the HART Protocol and 4–20 mA Loop Communication Test. Utilize flashcards and multiple-choice questions, with each question offering hints and explanations. Get ready for your exam!

Multiple Choice

If a system uses tone transmission, which aspect carries the data?

Explanation:
With tone transmission, data is carried by the duration of the tone. A pure audible tone is emitted, and the length of time that tone is present encodes the measured value. The frequency or presence of the tone itself isn’t changing to convey the value—instead, the value is represented by how long the tone lasts. Other signaling methods would use digital packets, a continuous stream of binary bits, or modulation of an RF carrier, none of which match tone duration encoding.

With tone transmission, data is carried by the duration of the tone. A pure audible tone is emitted, and the length of time that tone is present encodes the measured value. The frequency or presence of the tone itself isn’t changing to convey the value—instead, the value is represented by how long the tone lasts. Other signaling methods would use digital packets, a continuous stream of binary bits, or modulation of an RF carrier, none of which match tone duration encoding.

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