# About the timeout error in \`system.serial.readLine\`

**URL:** <https://forum.inductiveautomation.com/t/about-the-timeout-error-in-system-serial-readline/110440>\
**Category:** Ignition\
**Tags:** scripting, vision\
**Created:** [September 8, 2025, 7:19am UTC](https://forum.inductiveautomation.com/t/about-the-timeout-error-in-system-serial-readline/110440 "2025-09-08T07:19:02Z")\
**Posts on this page:** 1\
**Showing post:** 6

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**Author:** ![pturmel](https://sea1.discourse-cdn.com/inductiveautomation/user_avatar/forum.inductiveautomation.com/pturmel/32/3295_2.png) [@pturmel](https://forum.inductiveautomation.com/u/pturmel)\
**Post date:** [September 11, 2025, 12:19pm UTC](https://forum.inductiveautomation.com/t/about-the-timeout-error-in-system-serial-readline/110440/6 "2025-09-11T12:19:14Z")

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You should study this old topic if you wish to manipulate your UI from the background:

> [@Update GUI via Asynchronous thread](https://forum.inductiveautomation.com/t/update-gui-via-asynchronous-thread/9666):
>
> I’ve got a script I am experimenting with that can take a lot of time to execute, so I now use the system.util.invokeAsynchronous to run the script in a separate thread to keep the GUI from locking up. I am using the asynchronous thread to copy files from one place to another, and I would like to show the progress of the file copy with a progress bar. How would I go about this? I am importing a few python libraries to do this. import shutil def fileTransfer(): path = system.file.openFile() …

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