The B400 USB cable (301-0097) is now discontinued and no longer available to purchase. If you want to connect B400 over USB please read the following FAQ
However, if you already have the USB cable this article will still be relevant.
The B400 USB cable (301-0097) connects to the 18-way connector on the back of the B400.
Please note that you won't be able to connect the supplied 18-way cable once the USB cable is connected.
The installation of USB drivers for the B400 USB cable will be required and can be downloaded here - https://em-trak.sharefile.com/d-s1b436b3b828147eea40b130ac8b2805e