Printronix ThermaLine Series manual Must be used at both ends of the data field, but it will

D	The printable character (delimiter) identifying the start
	and finish of the data field. Enter any printable
	character other than a slash (/), the SFCC, or a
	character used within the data. The same character
	must be used at both ends of the data field, but it will
	not print with the data.
data field	Enter the characters for the bar code data, restricted to
	exactly 19 digits. Enter the Packaging Type Number,
	followed by the 7 digit Manufacturing Number
	(including Number System Character preceded by zero
	if a UPC number). Enter the 9 digit Shipping Container
	Serial Number. The characters available for the data
	field are 0 through 9 (30 through 39 hex, respectively).
PDF	Optional parameter to enable printing of the human
	readable data field. Enter PDF to print the data field. If
	the parameter is not used, the human readable data will
	not print. This parameter is not allowed if a null data
	field was specified.
LOC	Optional parameter to identify the location of the
	printable data field. The default value is B, locating the
	human readable data below the bar code. A locates the
	printable data field above bar code. To compensate for
	printing the 0.1±inch high data, the height of the bar
	code body is reduced 0.1 inch.
STOP	Ends the Bar Code command while the IGP/PGL
	continues in the Create Form Mode. Enter STOP. If
	STOP is not entered, an error message results.

NOTE: Refer to the Code 128C Character Set Table on page 5±48, for information on character sets.

Bar Codes 5±55