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In order to get access to the VBA script editor, you first need to make the corresponding buttons available on the Excel toolbars (they are not there by default). Other methods always require the installation of an ActiveX, or at least the registration of an “.ocx” file, like for instance the MSComm control. The great advantage of this method, which uses API functions to call the serial port directly, is that you do not really need to install anything on your PC, apart from the Excel itself (which, let’s admit it, already exists on most PCs). The purpose of this article is to demonstrate how you can perform serial port communication in the VBA (Visual Basic Applications – script editor included in any typical Microsoft Excel distribution) but without using the MSComm control or any other third party add-on or ActiveX.