How to change the COM port for a USB Serial adapter on Windows 7, 8, 8. The COM port setting in Windows is an arbitrary number that points to a particular address in the computers memory where data that is sent back and forth over a serial connection. If that number has not already been put into use to support a serial device, Windows will let you assign it to any serial device you have currently connected to the computer, such as Plugables serial adapter. Since the Port number is assigned by Windows when you connect a serial port, and released when you disconnect it, there would be no advantage in setting all ports to COM1. If two ports were set to COM1 and in use at the same time, this would cause problems, because one serial device would overwrite the information from the other in memory. However, this shouldnt happen because Windows will not let you assign a COM port to more than one device at a time. The COM ports are arbitrarily assigned by Windows. They are not set with any purpose, so feel free to change to any open COM port when necessary. Some serial communications software will only work with a specified COM port or only with COM1 through COM4. In those cases, you have to select an appropriate port in the Port Settings window. The numbers range from 1 to 2. Windows versions to allow a large number of serial devices to be attached without causing problems. Modern computers have plenty of memory available, so there is no problem of setting aside enough memory to support 2. The number 2. 56 is selected because it represents the maximum number of ports that can be addressed with one byte eight bits of information. Citavi Kostenlos. When you plug in a device known to Windows, it automatically loads the driver for it. Fundamentos Termodinamica Van Wylen on this page. When you unplug that device, Windows automatically unloads the driver. Devices that are similar to each other can use the same driver, and Windows just copies in into memory to be used to control a particular device on a particular COM port. When using USB serial devices, Windows tends to assign the same COM port number to devices plugged into the same USB port. That may be why you are frequently seeing COM1. I hope this helps. David. Plugable Support. PL2303HX provides a convenient solution for connecting an RS232like fullduplex asynchronous serial device to any Universal Serial Bus USB capable host. Malaysia/usb-to-rs232-serial-port-adapter-screw-terminal-prolific-pl2303-ioline-1209-20-ioline@1.jpg' alt='Pl-2303 Usb To Serial Driver Windows 7' title='Pl-2303 Usb To Serial Driver Windows 7' />Daniel, I assume youre talking about a USB to Serial RS232 cable. RS232 uses different levels than TTL so you cant use one of those directly with a. I got my end of life PL2303 HXA USB serial converter to work on Windows8 64bit by doing the following. Visit the prolific site and get the following driver. Windows Drivers. OPTION A If you are using an all white Data Cable. For Windows XP, please use these drivers. For Windows Vista and Windows 7, download these drivers. FTDI Windows 8 USB Serial Driver Windows 8 x64 Windows Server 2008 R2 Windows 7 FTDI USB Serial Adapter Driver Windows 7 x64 Windows Server 2008 Windows. Drivers Ed Module 11 Answers'>Drivers Ed Module 11 Answers.