How to connect the RS485 by urcap

I develop the urcap using RS485 and some gpio. I read GitHub - UniversalRobots/Universal_Robots_ToolComm_Forwarder_URCap: Utility to forward the UR Tool Communication Interface (RS-485) to a remote PC., GitHub - EbbeFuglsang/Modbus_URCap: A tool modbus RTU URCap . But, I can’t understand. Plese tell me how to connect, control the RS485 in urcap