Printronix ThermaLine Series manual Character used within the data. It will not print with

SR	Defines the starting row for the bar code. Enter a value
	ranging from row 1 to one less than the length of the
	form. Character row or dot row is specified based on
	the Scale command (page 4±88), or use the CP.DP
	format (page 4±7).
SC	Defines the starting column of the bar code. Enter a
	value ranging from column 1 to one less than the width
	of the form. Character column or dot column is
	specified based on the Scale command (page 4±88), or
	use the CP.DP format (page 4±7).
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. (It will not print with
	the data.) Use the same character at both ends of the
	data field.
data field	Enter the characters for the bar code data, restricted to
	exactly 11 digits. If the 2± or 5±digit add±on data
	option is used, include this data at the end of the data
	field. The first digit is interpreted as the number system
	character. The remaining 10 digits are the data field
	characters. The characters available for the data field
	are 0 through 9 (30 through 39 hex, respectively).
PDF	Optional parameter which affects printing of the
	human readable data field. The data field will print
	automatically unless the PDF±suppress command is
	specified in the FONT parameter. OCR-B characters
	can be printed above or below the bar code symbol.
	This parameter is not allowed if a null data field is
	specified. If the PDF command is not entered in the
	UPC±A command format, the data field automatically
	prints in OCR±B.

5±108 Bar Codes