-@deffn {Config Command} {ftdi serial} serial-number
-Specifies the @var{serial-number} of the adapter to use,
-in case the vendor provides unique IDs and more than one adapter
-is connected to the host.
-If not specified, serial numbers are not considered.
-(Note that USB serial numbers can be arbitrary Unicode strings,
-and are not restricted to containing only decimal digits.)
-@end deffn
-