To check whether or not an RS-232 serial port is working, perform an RS-232 loopback test by doing the following: Eden wake up mp3.

1. If your serial port is not female, convert it by taking a female/female cable or gender changer and plugging it into the serial port.
2. Take a metal paperclip or wire and cross pins 2 and 3. If you look closely at the female end, the pins should be numbered.
3. Open a telnet session on the COM port number of the device that you are testing. To find out the COM port number, refer to the following FAQ: https://www.startech.com/faq/com-port-listing-windows.

This app can also be used for serial communication with HC-06 and HC-05. This profession version allows the user to send packets of data. Serial COM ports can be accessed through this app and communication can be established between the devices. This is a Terminal app that allows you to send data packets of different formats.

Note: To open a telnet session on the COM port, you need a telnet client like PuTTY or Hyper Terminal. Velaikaran song download. Windows XP comes with Hyper Terminal.

4. When the session is open, anything you type into it you should see. The loopback test fails when you cannot see what you are typing.

If the loopback test fails, make sure that the serial cable or gender changer that you are using works and that the adapter is in the correct port.

You can check multiple ports at the same time by opening multiple sessions, putting the loopback adapter on one port, and trying to type into each session. When you can see what you are typing, you know that the COM port is working and you can see which port number the physical serial port is. Close the window for the port that you just tested to speed up the testing of the remaining serial ports.

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How would I go about viewing a list of COM ports in use without the use of Device Manager?

I don't want to install any software either. Is there a possible way to do this through the command line?

7 Answers

In the command prompt use

mode

Used without parameters, mode displays all the controllable attributes of the CON (console) and the available COM devices (and LPT as well).

Accepts /? switch for basic help:

mode /?

In the command prompt use:

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OR

In PowerShell:

OR

Hope this helps.

I know the question has been answered, but this is another method.

In command prompt, use:
chgport
in windows Vista and up. Lists your ports and which device they are.

Using mode most of the time I don't see the devices that are not connected.

I prefer to use this solution with Python:

So I can see anything plugged in even if the connection is closed.

serial.tools.list_ports is from package pyserial.

wmic https://docs.microsoft.com/en-us/windows/desktop/wmisdk/wmic is a windows command line utility to get system information.

If your serial port is virtual created by some driver through USB connection, use this example to get details about these serial ports.

The snippet below lists serial ports into the $PORTS variable

PORTS=/c/Windows/System32/mode.com grep Status.*COM awk '{ print $4 }' sed s/://

echo -n 'Programming (echoing) ports: 'for aa in $PORTS; do echo -n $aadoneecho '

You can also run the following from cmd.exe prompt

And here is an open source utility to do the same and more:https://todbot.com/blog/2012/03/02/listcomports-windows-command-line-tool-for-usb-to-serial/

protected by Community♦Feb 2 at 20:37

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