I'd like someone to clarify the iEXOS-100 connection to computer.

In the mount manual there is an image showing miniUSB port. In the indilib Devices/Mounts/Explore Scientific PMC-Eight/Requirements section, there is a statement that says we have to use SPECIAL USB Serial cable and link to the solution incorporationg a FTDI USB<->Serial cable.

What is the purpose of using this SPECIAL USB Serial cable if we already have an USB port in the computer and mount itself?

Clear skies!