MX-28R communication with Arduino UNO

Hi! I need to do the communication between a MX-28R (that supports RS485 communication type) and a Arduino Uno. I have already got a RS485 shield for this, but I'm a bit stuck because I don't know how to connect the cables and define the pins in arduino sketch in order to do the position control of the servo. Can you help me please?

Thank you!

Hello

I have the same problem.
Please, if you have alrady find solution, share with me.

I also have MX-28R, with arduino uno and a shield RS 485.

Thanks