COMxL RS232C - Version 2.20 COMxL RS232C, an ease-to-use and very-helpful Add-Ons / Add-Ins of MS Excel 97/2000, lets you link your measuring instrument to your any Excel worksheet directly via RS232C port. The readings from instrument can go/fill-in anywhere you want to them to go by just simply hightlighting the range Now yuo can use RS232 port in MS Excel to import DATA from instrument or other computer with ease.