tonypaul57:
But there is something I don't know, how to modify the com port in mac office 2016, there is no com port number, in Mac the port only show "/dev/cu.usbmodem1421".
well ... I don' own a Mac and therefore cannot provide any support for that - but you could maybe try to unhide the settings sheet on Excel (I hid it by default) and manually add your port number in there in the correct cell (will be labeled). Might be that Excel on Mac translates that number to the correct address? Sorry, but that is all I can suggest.