Author Topic: TeraTerm -> changing serial COM ports  (Read 315 times)

Offline mark

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TeraTerm -> changing serial COM ports
« on: February 09, 2026, 01:44:26 AM »
Hi All

I recently upgraded TeraTerm from V4.106, which I was using successfully for a few years, to V5.5.2 and had an issue that was not obvious to solve.

The first thing that I did was to save my COM port setup for use with a certain HW connection (Baud rate and COM port used) so that it always stated with it. That works fine.
But I found that I couldn't connect to any other COM ports and I also couldn't connect to virtual COM ports - TeraTerm remained disconnected.

Initially I assumed some problem with virtual COM ports (which I had also just set up and was trying to confirm with the new TeraTerm version) and so I experimented with installing and de-installing these but without any improvement.

It turns out that newer versions of TeraTerm require a different method when ports are changed:
- it is not possible to start TeraTerm with a pre-defined COM port setting (in its TERATERM.INI) and subsequently change it to another COM port using "Setup | Serial port..."
- to do this these steps are now needed:
- - "File | Disconnect"
- - "File | New connection..."
- - "Setup | Serial port..."
Now the new COM port connects. The original Baud rate and other settings are retained.

I found it out here: https://github.com/TeraTermProject/teraterm/issues/552
where there is also an explanation for the changes that were made.

Regards

Mark