A final thing that should be done before creating the PCB-layout is running the Electrical Rule Check (ERC). This is done by the ERC-command from the toolbar. The electrical rule check verifies various constraints regarding the connection of components. It will for instance warn about unconnected input-pins (which is why we made the tri-state inputs in the library for MAX3089 into I/O-pins. It also warns if you are connecting the supply voltage inappropriately or if you forget to connect it. You should, however, know that a DRC can not guarantee that no errors exist, but only help pinpointing some fo the more obvious ones. If the DRC comes up with any warnings, you should try to pinpoint and solve the problem before moving on. Once all ERC errors and warnings have been eliminated (or at least thoroughly considered), you can go on to routing the circuit board