Use the driver wizard to solve the usb to com port method: to the computer city to buy a RS232U port to COM port data cable. Note that the two ends of the data cable are different. Download the driver wizard. And install it. Driver wizard is a very powerful software, the same type of software there are many. You can look it up online. Turn on the computer and plug in the RS232 cable. No driver is installed on the data cable at this time. Open the Admin button and you will see that there is an unknown device. Start the driver wizard. It scans the computer's driver program and recognizes the computer by itself. Click directly on the right to install. The software downloads the driver. At the same time, the driver installation page is displayed after the download. After the installation succeeds, a message is displayed indicating that the installation succeeds. You can see the installed driver in the device manager. Right-click the driver and select properties. Select Port Settings and select Flow Control. There are three options, and here \"Xon\/Xoff\" is selected. Select Advanced, Open COM Port Number Select an idle port number. Note that it is necessary to correspond to the port number on the engraving machine, because the engraving machine generally has only two com port numbers COM1 and COM2. So you must choose these two port numbers on your computer. So it can be used normally.