Motors are the end of the line in multiplex systems. They are; however, the only part of the system that performs any real work. The multiplex system must relay information from the user to the motor and the motor must act on this information in an appropriate manner.This paper analyzes the motor/multiplex system interface and presents a solution to this problem. By integrating the diagnostic, communication, and power electronics within the motor (i.e. a smart motor), interface problems associated with output control are minimized. This allows total control over the motor directly from a body computer, demultiplexing node, or other device capable of producing the appropriate digital signals. By providing diagnostic information concerning the operational state of both the motor and the control electronics, the smart motor allows more, intelligent control of these subsystems.