Ensure that you are using the type of cable required (regular or null modem depending what you are connecting to). Nothing on the screen Try hitting enter a few times, or rebooting the device you are connecting to.Įnsure that the cables are properly connected, or try reseating them.In this case try running the program as an administrator.

Less often this issue can be caused by a permissions issue. Find out which program is using the port and disconnect it.Īlternatively you can use a different COM port if you have one available.

Unable to open COM port COM1 COM2 COM3 The unable to open serial port message usually occurs when the com port is in use by another program.

Click OK again, and the program will attempt to connect.

If you need HyperTerminal to control serial devices, there is a. In Windows 7, Vista, and 10, you will no longer find the HyperTerminal program.

Click Configure and change the port settings to match the settings required by the device you are connecting to.

Select your COM port under “connect using”.To set up a serial terminal connection in HyperTerminal, First enter a name for your connection, click OK.How to create a serial com port connection

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