Definitions for "Serial communication"
Serial communication refers to the transfer of data between a UPS and a Controller using serial COM ports. Most UPSs ship with a serial communication cable made specifically for that UPS. Consult your UPS manual for more information about connecting a UPS to a computer. For network communications, see Simple Network Management Protocol.
Communication between computer components that transmits information one bit at a time along a single path
Transmits data one bit at a time over one wire; vs. parallel communication which transmits several bits at a time over several wires.
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See RS-232.