Hi Darren,

My manual says:

14.3.2 Modbus Interface
The Modbus communication is via RS485 interface, see descriptions on RS485+ and RS485- in chapter 8.1 "Wiring Diagram" on page 50 and chapter 8.3.2 "Control Terminals" on page 65.

It explains how to wire in details. Anyway, I posted on CNC Zone as well as on my Youtube video. Did it help?