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=== Serial Interface Control Commands ===
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The command controls the behavior of the UE‟s DCD (data carrier detection) line.
[https://wiki.teltonika-networks.com/wikibase/images/2/2e/Quectel_EC25EC21_AT_Commands_Manual_V1.2.pdf#page=32 '''3.1. AT&C Set DCD Function Mode - page 31''']