If RS-232 communication from the client cannot be established: On each workstation, launch a remote session and use Windows HyperTerminal with a serial device to test RS-232 input from the workstation. When you click Connect, the information you have entered in Options becomes the default setting for all Remote Desktop connections and is saved in a file called Default.rdp. On the Local Resources tab, under Local devices, select the check box for Serial ports. In the Remote Desktop Connection window, click Options. To open Remote Desktop Connection, click Start, point to Programs or All Programs, point to Accessories, point to Communications, and then click Remote Desktop Connection. On previous versions of Windows 2003 Server, RS-232 communication via Terminal Services did not function correctly and generated an error 8020 ('error reading comm device').įor each workstation, configure your Remote Desktop Connection settings: On the terminal server, verify that you are running Windows 2003 Server with (at minimum) Hotfix 838291 or Service Pack 1 (preferred). These steps configure your Terminal Services connection so that client COM ports will be automatically mapped to their equivalent port numbers on the terminal server.

The method used to perform this step depends on the server operating system version in use: To successfully perform RS-232 communication from a Citrix or Terminal Services client, you must make the client COM port available during a remote session. Map client COM ports to the terminal server

Com port terminal windows