On 21/07/2021 18:33, Bruce N7XGR wrote:
The main ingredient is a 4 port USB hub inside of the 991.
IC and the UART com port IC connects to it. I believe that
are 2 com
ports, a standard and an enhanced, and so a 4 port
Device Manager open expand the USB controllers tree with the USB
now plug it in and observe if this list changes by one.
does not then the 4 port hub is dead.
you are confusing USB ports and USB endpoints. I doubt there is a
USB hub in the FT-991A, it is more likely a single device with
multiple endpoints for audio in, audio out, and a pair of serial