Is there an example of controlling an Oriental Motor AZD-CD drive (w/stepper) by modbus to Unitronics US7-B10-TA30 PLC? Do I use the ethernet port to connect to the drive? The motor driver has RS485 inputs. I can control this motor via direct I/O but can't get its position...so I figured that I need to go with modBus. Is there another way? Thanks!