If the keyboard has the usual 5 Pin DIN connectors then I think your focus rite has these too - so try those.
If you check the manufacturers site and see if there are drivers, use them - if there are not drivers, then your computer may not be using a driver that works. If your keyboard has a USB output then when you connect to the computer, it should load a generic USB driver, or the manufacturer provides a USB driver that offers keyboard specific extra features. Connectors A or B don't make any difference.
