each platform mounted mold assembly for plastic tubing includes a circuit board containing parameters defining elements of the forming , molding , tipping or welding operation to be undertaken on the tubing . a control unit includes an rf generator for providing the rf energy to effect the forming , molding , tipping or welding process , a source of air under pressure to operate the mechanical elements attendant each mold assembly , various sensors and a multiplex unit . in operation , the control unit serially addresses each of the mold assemblies , senses the parameters attendant the mold and applies the appropriate power level of rf energy for a specific duration and temperature while activating the mechanical aspects of the mold assembly . the mold assemblies may be serially activated through a multiplex unit or in a particular sequence that may be operator controlled .