3/20/2017 0 Comments Virtual Serial Port Windows 98How To Use Host Serial Port From Guest In Virtual. Box. As an Embedded Software Engineer serial port access is very critical requirement for me irrespective off which OS I am using and how I am using it (I mean with or without virtualization). I. I hate to manage two computers for two reasons first is it makes workplace really messy with extra wires and Second is I always need some space to keep items like Power Supplies, Oscilloscopes, Programmers, Debuggers etc. Virtual Box does provide this feature and its quite easy to configure as well. The problem is, it can be done in more then one way and that’s where user might get confused that’s why I am writing this post. I have the same problem with a Vista Business guest under a Windows XP host. I need virtual serial port access to let. VirtualBox Serial Debugging on Windows. Configure a COM port for a virtual machine. This option connects the virtual serial port to a Windows named pipe on the host operating system. HW Virtual Serial Port. HW Virtual Serial Port. HW VSP from version 2.3 works on the Windows 98, NT. More Virtual Serial Ports can be emulated in one computer. FTDI designs and supplies USB semiconductor devices with Legacy support including royalty-free drivers. Windows 98/ME: 2004-11-25. DOS / Windows 3.x / 95 / 98 / ME. If a virtual serial port is enabled. You can tell VirtualBox to connect the virtual serial port to a software pipe on the. Before jumping into action we will just find little more information about serial ports. How Serial Ports are Named: In windows like operating systems serial ports are named like COM1, COM2 and so on while in Linux they are named like /dev/tty. S0, /dev/tty. S1 and so on. As my example involves both operating systems it might create some confusion, as a rule of thumb what will call COM1 in windows will be /dev/tty. S0, COM2 will be /dev/tty. S1 and so on. Even though the names are different they refer to the same Interrupt and IO ports and that’s how we map these names. Name Under Windows. Name Under Linux. IO Address Interrupt Request (IRQ)COM 1/dev/tty. S0. 0x. 3F8. 4COM 2/dev/tty. S1. 0x. 2F8. 3COM 3/dev/tty. S2. 0x. 3E8. 4COM 4/dev/tty. S3. 0x. 2E8. 3Setup & Requirement: My computer has four serial port COM1, COM2, COM3 & COM4 . My requirement is very simple I want to access COM3 in my Kubuntu guest installed under Virtual Box Virtual Machine. This is pretty easy if you know what to IGNORE on the serial port configuration dialog of Virtual Box. For our purpose IGNORE IRQ, IO PORT and Create Pipe fields. On Port. 0 Tab select Enable Serial Port check box (you will not be able to change any other setting till you check this one). Port Number : This field refers to port number under guest OS, we want to map it to COM1 (/dev/tty. S0) so select COM1 (remember it has nothing to do with physical ports)Port Mode: We want to connect virtual device to physical device on host so set it to “Host Device”Port Path: For “Host Device” port mode this field refers to physical device port number on host, we want to connect to COM3 on host so enter COM3 here. Check out the screen shot below for Virtual Box Configuration. Virtual Box Serial Port Settings. That’s it just set these 3 fields to correct values and you are done. Now lets check if it really works or not, as I said my virtual machine runs Kubuntu so the serial port COM1 (Technically the port with IRQ= 4 and I/O Port = 0x. S0. Verification Under Guest OS: To verify the serial port operation under guest OS we need some Kind of Serial Port terminal for gust OS. As our guest OS is Kubuntu I have used Cutecom. Now the actual verification can be done in two ways. Short Pin 2 and 3 of the physical serial port, this will short the Rx and Tx pins of the serial port and whatever you send through terminal will echoed back to the terminal. Connect any RS- 2. I will choose the first method because it will work for everyone, so short RX and Tx pins for your physical serial port and configure Cutecom to set the device to /dev/tty. S0, make other settings as per screen shot below. Cutecom Settings. See it in action below: Working Serial Port Under Guest OSFinal Thoughts: In order to map COM1 to /dev/tty. S0 we need to set both Port Number and Port Path fields to COM1 in Virtual Box serial port settings. Even though I have tested it on Kubuntu it should work on any Linux destro. If your guest OS is Windows you can use the Hyper Terminal program and port name given in Port Number field of Virtual Box serial port settings. Please note that the selected physical port can not be accessed by the Host when the Virtual Machine.
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