Serial communication has become the standard for intercomputer communication. Serial communication is a form of I/O in which the bits of a byte begin transferred appear one after the other in a timed sequence on a single wire. Serial communication is often used either to control or to receive data from an embedded microprocessor.Universal Serial Bus Specification Revision 2.0 ii Scope of this Revision The 2.0 revision of the specification is intended for product design.