If PuTTY fails showing the error Unable to open connection to COM1.
Configure Virtual Serial Port Registration Code Serial Ports OftenApplications suited for serial ports often involve sensors, controllers, old check readers, pads, and so forth.
Some USB virtual COM-port devices use vendor-specific drivers in place of the Windows-provided drivers (usbser.sys). These drivers allow you to force the virtual COM port of the USB device so that it doesnt change even if connected to different USB sockets. This might be done from the Device Manager Ports (COM LPT) Properties or from the application that controls the device. Because a device can attach to the endpoint by using USB directly, doesnt mean it can be redirected using generic USB redirection. Some USB devices function as virtual COM ports, which applications can access in the same way as physical serial port. The operating system can abstract COM ports and treat them like fileshares. Get an RS-485-to-RS232 converter to use RS-485 as a COM port. Some applications recognize the device (for example, a signature pad) consistently only if it is connected to COM1 or COM2 on the client workstation. After applied, some information is available in HDX Monitor. The list that appears contains mapped drives, LPT ports, and mapped COM ports. Configure Virtual Serial Port Registration Code Install Your COMFor example, if you map COM1 on the client to COM3 on the server, install your COM port device application in the VDA and point it to COM3 during the session. You cant map Windows Telephony Application Programming Interface (TAPI) devices to client COM ports. TAPI defines a standard way for applications to control telephone functions for data, fax, and voice calls. TAPI manages signaling, including dialing, answering, and ending calls. Also, supplemental services such as holding, transferring, and conference calls. While the port is not mapped to the VDA, you are not connected to a Citrix session. Follow any troubleshooting instructions that came with the device and verify that it works locally first. When a device is connected to a serial COM port, a registry key is created on the hive shown here. The output might display the COM port in use and the BaudParityData BitsStop Bits, which you need in your PuTTY session. If the PuTTY connection is successful, press Enter to see feedback from the device. Whatever characters you type might be repeated on the screen, or responded to. If this step is unsuccessful, you cant access the device from a virtual session.
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