Add display of scale output to BI camera

[ellenstroble]

Hello,
I have a truck scale with an RS232 output that provides live weight data in text format. I'm trying to add a visual overlay of this output in BlueIris. I suspect a macro might help, but when I try to use "show overlays" with a .txt file, the text data doesn't display on the camera. It shows static text in the "edit overlays" menu, but it never appears in the live view or recordings. I do have the date and time overlays enabled, and those show up fine.

Any suggestions? Thanks!