Using PuTTY for serial COM connections (HyperTerminal replacement)

If you’re looking for a free and solid application to use for your serial COM connections, try PuTTY. It’s free for commercial and private use, and takes up a mere 444KB of disk space.

The latest PuTTY version can be downloaded here:

Windows Vista and Windows 7 only support the private edition of HyperTerminal. Windows 7 does not even ship with HyperTerminal. The private edition is NOT FREE for commercial use. Its license requires you purchase the application if used commercially, with the cost of the application being US$59.99, as listed on Hilgraeve’s website.

To use PuTTY for your serial COM connections, follow these steps:

  1. Figure out the COM port you’ll be using.
  2. Run PuTTY.
  3. Switch the Connection Type to Serial.
  4. Edit the Serial Line to match the COM port you want to use.
  5. Edit the Speed to match the BAUD Rate you want to use.
  6. Select the Serial category from the menu on the left.
  7. Make sure all of the settings are correct (the settings in the screenshot are what I used for my session, yours could look different depending on what you’re connecting to).
  8. Select the Open button to start the session.

Your connection should now be fully functional.

If you find yourself using PuTTY quite extensively, you could save settings to different profiles for fast future usage. To create a profile for your settings:

  1. Make sure you have the settings you require.
  2. Enter a profile name under Saved Sessions.
  3. Click the Save button.

On your next PuTTY session, you can load your profile by selecting it from the list and clicking the Load button.

Logging is also a great feature that PuTTY provides. It lets you output your entire session to a log file. To enable logging, follow these steps before you open your connection:

  1. Select Logging from the category list on the left.
  2. Choose your desired logging method (All session output, printable output, etc…)
  3. Enter a file name.
  4. Select the file handling settings.
  5. Open your connection.

13 Comments on Using PuTTY for serial COM connections (HyperTerminal replacement)

13 Responses to “Using PuTTY for serial COM connections (HyperTerminal replacement)”

  1. bam says:July 30, 2013 at 4:24 pm

    Hello,Your info is very helpful.Thanks.


  2. jan says:February 11, 2014 at 9:28 am

    my serial putty configuration to an ubuntu system has wrong output: e.g. ýûþþüÌþüis as keyboardoutput. Is there anything to change to get readable output ?

    • juan says:February 18, 2014 at 4:55 pm

      Try differents baud rates.

  3. Parya Myanka says:March 2, 2014 at 2:35 pm

    SimpleTerm Gold – Stater Liteis a free alternative and is much easier for COM port or RS232, TTL based development work.

  4. Jimoh Mojisola says:April 16, 2014 at 9:33 am

    thanks for the infoI am trying to program a bluetooth adaptar using Putty, having done the configuration as above, i couldn’t get any response(after writing the command(using Attention (AT) command)

  5. Muzz says:December 31, 2014 at 3:47 am

    This is great stuff. Not quite putty in my hands tho’. I went to full screen but had no idea how to get out of it. I tried right click – nothing, esc – also nothing

  6. pandyanadiad says:August 24, 2015 at 5:58 pm

    Thanks for such a useful information. I have putty software long back but i don’t know how to use thanks for information.

  7. slim says:January 10, 2016 at 12:10 pm

    Thx, it’s useful and you made it easy :)

  8. Bill says:March 12, 2016 at 2:16 am

    Doesn’t allow me to type anything.The black window opens, green cursor flashes and that’s it.Doesn’t accept any keyboard input. (Yes, the keyboard works)

    • Sandy says:August 7, 2016 at 10:24 am

      How do I edit text from serial SLABS CP2104 of Option Globesurfer 3.I need to reset to factory and I know how to but I cannot get the text editor to work

  9. The year of our lord MMXVI says:April 20, 2016 at 9:59 pm

    Thanks for the info! Wasn’t working at first but I was testing the wrong COM ports.

  10. Manel Rabhi says:June 24, 2016 at 1:49 am

    thank you for the info , I am using Putty serial with a sipex SP3232ECP ,after connecting my cart via vpga , i open my putty connexion but i receive error messages .

  11. RIDHA says:August 7, 2017 at 6:09 am

    my serial monitor does not response to the keyboard , the cursor standstill with no any response to the key board


Gateway Selector

Select your combination of protocols.
Protocol 1
Protocol 2

Contact Us

Contact us via phone (+1 866-383-1657) or leave a detailed message below for sales, support, or any other needs

*Required Field
*Required Field
I'd like to receive the newsletter. *Check email for confirmation.
*Required Field
8:00am - 12:00pm 12:00pm - 5:00pm