Off line response please to frank at electronicinstrument.com <mailto:frank at electronicinstrument.com> I am trying to figure out how to implement the PS0 command. Have been using HRD now for years with a TS-590 and want to migrate completely to the K3. I have the latest HRD as well as a K3 / RS-232 and Windows 7 Professional 64 bit. Frank KG9H