I have a SLC 500 cat number 1747-L532. The only ports on the processor are a DH485 and a serial port. I want to try and connect this to our remote network. Either by DH+ or ethernet i was going to change the processor to a SLC 05 with a ethernet port. But the HMI is connected to the DH485 port. Not sure what to do i don't have a lot of experience with DH485 or Serial. Was wondering what some of my options where?