Resource busy while trying to connect to serial
I am trying to connect serial port from my mac and getting below error-
minicom: cannot open /dev/**.usbserial-0001: Resource busy
That message means that device is being used by another process.
I realize minicom is open source. As such it's not a native Apple process; it's something you installed, so you have to research how to use it. I suggest Minicom - Community Help Wiki but only because I happen to use Ubuntu Linux. Other resources are available.
If you need a serial port consider using an app dedicated for that purpose.