If your device must use COM 1, then pay attention. First of all, see if your computer motherboard has its own COM port, that is, serial port. If it is COM 1, it can be directly connected and used. If you want to use the device interface of COM 1 instead of serial port, you can connect it to the USB port of the host and install the driver. Then I can tell you that it must be above COM2, such as COM3. You can change the port of COM3 to COM 1, right-click My Computer-Management-Device Manager, select -port (COM port and LTP) and then select the device to be changed, and right-click Properties-Port Settings-Advanced COM port number to COM 1, so you can change it. The same device is connected to the same USB port. If the driver is installed in the former and the driver is not installed in the latter, the port number will not change. However, if the front and rear devices are different, even if they are connected to the same port, they cannot be the same!