RS485 communication interface

Hi All, We are very pleased with what our UR20 is doing and how we are getting on with the programming. I would like to expand the end effector but the wiring is getting too much and i hope i can slim things down using some sort of interface and the internal wiring. I wish to have 3 digital outputs and 7 digital inputs on the effector using only the internal wiring.

Can anyone recommend a RS485 communication interface i can have on the end effector please? The digital inputs could be slimed to 3 possibly if that makes it easier.

Kind regards

Sam