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?

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.jpghttp://www.chameleon.rs/e035020.pdf