First and second communication protocol arrangement for driving primary and secondary devices through a single port

A communication circuit, comprising:

• a first control circuit configured to communicate with an energy module using at least a first protocol over a first communication line;
• and
• a second control circuit configured to communicate with a surgical instrument coupled to the communication circuit using at least a second protocol over a second communication line;
• wherein the first control circuit comprises:
• a communication logic circuit coupled to first communication line and to the secondary controller;
• a local processor coupled to the communication logic circuit;
• and
• a multiplexer having inputs coupled to the local processor and the second control circuit, and an output coupled to the communication logic circuit;
• wherein the communication logic circuit is configured to:
• receive a message from the generator over the first communication line;
• provide a recognized message to the local processor for local processing;
• and
• provide an unrecognized message to the second control circuit for processing.

A communication circuit, comprising:

• a control circuit;
• a potentiometer circuit coupled to the control circuit;
• a switch circuit coupled to the control circuit and the digital potentiometer circuit;
• and
• an adjustable filter;
• wherein the control circuit is configured to communicate with a surgical instrument using a first and second communication protocol over a single communication line, wherein the adjustable control filter is coupled to the single communication line.