Connecting your scale to the PC In order for your PC to read the weight from the scale, your scale's digital weight indicator or scale indicator must be connected your PC. This is almost always accomplished by connecting an RS232 port on your scale indicator to a RS232 serial port on your PC with the appropriate interface cable. STM32F7 USB CDC VCP unable to open serial port Posted on July 03, 2018 at 18:53 I have strange problem on my hand which I can't figure out if it is a Windows driver or USB stack issue. Thread from 18 Nov by OP how to read weight from a scale machine through serial port in vb.net. La vida loca. Friday, December 26, 2014 11:06 PM. This example USB CDC ACM implementation provides a Virtual Serial port running over high speed USB. The Virtual Serial port supports the standard requests associated with ACM model of the class. A serial terminal program from host PC connects to virtual serial port and interacts with the application.
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Most electronic scales and laboratory balances have an RS232 (Serial) or a USB port however no instructions are normally provided to show you how to correctly connect it to your PC or how to input weight values directly into programs like Excel or Access. The steps below will show you how to connect your scale to a PC and identify what port the scale is connected to and also how to input weight readings directly into Microsoft Excel.
The only things that you will need are an appropriate cable that connects from the scale to your PC and a Windows program called a 'Software Wedge'. In this example, we will use a product called BC-Wedge from TAL Technologies, Inc..
Note: This tutorial assumes that your scale or balance has a 'Print' button that will transmit weight values to a PC. Most scales and balances do have one although it may not be marked clearly. You may need to read the users manual for the scale or contact its manufacturer to learn exactly how it works. If your scale does not have a Print button, it does not necessarily mean that you cannot send weight data to a PC. It means that you probably need a more advanced software wedge like the WinWedge product from TAL Technologies.