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Need checkup for my USB -> DMX & 5way splitter project

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3dBi:
I'm trying to make a USB to DMX box with 5way splitter on one board. Could you please check my schematic for beginner errors?  :palm:

This device is intended for my personal use, to get better light show for my band playing weddings, parties etc.

Solder pads IN+ and IN- are going to DPDT switch to switch between external XLR input and USB stuff coming out of pads A and B.

Also do outputs of 485 need to be biased?

Inspiration to do this came from these sources:
http://juvar.mbnet.fi/blog/wp-content/uploads/2018/09/schematics-rev2.jpg
http://www.chameleon.rs/e035020.pdf

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