Printronix ThermaLine Series manual This parameter is used

ASPECT;h:w	Optional parameter for specifying the symbol
	height±to±width ratio where h is the height and w is
	the width, both expressed as integers. The default is
	1:2. Parameters Hn, Wn, Rn, or Cn cannot be entered if
	this parameter is used.
Rn	Optional parameter that specifies the number of rows
	the symbol will have. Enter R; followed by the number
	of rows in the range of 3 to 90 in multiples of 3.
	Parameters Hn, Wn, Cn or ASPECT can not be entered
	if this parameter is used.
Cn	Optional parameter that specifies the number of
	columns the symbol will have. Enter C; followed by
	the number of columns in the range of 1 to 90.
	Parameters Hn, Wn, Rn or ASPECT can not be entered
	if this parameter is used.
Sn	Optional parameter that specifies the security level.
	Enter S; followed by the security level in the range of
	0±8. The default is 2.
BFn;L	Optional parameters for assigning a dynamic bar code
	data field location on a form and for designating the
	length of the data field. With these parameters, the
	actual data for the bar code data field is dynamically
	provided during the Execute Form Mode; the data is
	not specified during the Create Form Mode. To use this
	field, perform the following steps:
	a. Enter BF.
	b. Replace n with a number ranging from 1 to 255
	to identify the bar code field. The SR and SC
	parameters specify the exact location of the bar
	code field identified by n.
	c. Replace L with a number equaling the total
	number of characters in the field. (The actual
	data provided dynamically during the Execute
	Form Mode can be less than L.)

Bar Codes 5±95