Code 11 - also called USD-8 - holds digits and the hyphen. It was made for labeling telecommunications equipment, and that's still where you'll mostly meet it.

What it holds
Characters	Digits and the hyphen (-).
Length	Up to 121 characters.
Check digit	Optional: one or two check digits at the end, called C and K. You turn them on with Check digit and choose how many with Check digits.
Readable text	The value, under or over the bars.

Settings
Check digit	No check digit, Barcode and text - the check digits are in the bars and printed at the end of the value - or Barcode only, in the bars but not printed.
Check digits	Automatic check digits adds one check digit to a value of up to 10 characters and two to a longer one, as the standard has it. 1 check digit and 2 check digits choose for themselves. It's available unless Check digit is No check digit.

The rest of the settings - text position, quiet zone, color - are in the Barcode section.

What goes wrong
Invalid data in input.	The value has something other than digits and hyphens.
Input data too long.	More than 121 characters.