Answer

Answer:

 The majority of the USB extenders have a 14 USB device address limit connected to the REX.  If you are using USB hubs cascaded to the USB extenders and require more than 14 USB devices connected to the Rex then you should use additional extenders and spread the devices across both sets of the USB extenders.

    
Keywords:

USB Rover 1650, 96047727, USB Rover 2650, 96047728, USB Ranger 110, 96047729, USB Ranger 410, 96047730, USB Ranger 422, 96047731, Ranger 140 USB 2.0, 96047751, Ranger 440 4 port USB 2.0, 96065185, Ranger 442 4 port fibre-optic USB 2.0, 96065273, Ranger 444 4 port fibre-optic USB 2.0, 96065274, Rover 200-1 USB isolator, 96055086, Rover 200-20 USB isolator, 96055084, Rover 200-40 USB isolator, 96055085.