Common words are filler words that do not contain a measurand and are
filled with a common pattern. This pattern can be static, such as a hexadecimal
word, or dynamic, such as the value of an input port or function generator.
Common words are entered into all unused frame words. Encoders normally
build a frame for transmission by first filling the entire frame with
common words, then overwriting each word by the required data frame and
subframe sync words, which are followed by measurands as the major frame
is completed.
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