I have some difficult to understand the issue and I would like to ask you if you can help me. Can you please explain how you are using the Serial Software and what you are expecting that does not work ...

So let’s say your using an Arduino in your project. You already have the hardware-based serial interface working with one portion of the project and need a second serial port for unrelated hardware.

Download the latest version of Arduino IDE for macOS. Open the installer image and move Arduino IDE.app to the Applications folder. Launch the app and allow it through macOS Gatekeeper if required.

Before I start talking about this really cool thing called Arduino (Italian for "good friend"), let me say a few things about the fascinating subject of physical computing. Physical computing has been ...