Additional fields after the serial string:
-One byte: 0 - reserved for "legacy port name prefix"
-One byte: 0 - reserved for "legacy port name prefix"
-One byte: 0 - reserved for plug and play options
+0x00, 0x00 - reserved for "legacy port name prefix"
+0x00, 0x00 - reserved for plug and play options
(Observed values with PnP == 0:
-0x02 0x03 0x01)
+0x02 0x03 0x01 0x00)
Note: The additional fields after the serial number string
collide with the official FTDI formula from AN_121 regarding