HP 5961-0509 manual Text Path Label Origin, Position is updated using an average delta X space

The pen position at the end of the label string depends on whether two successive LB commands concatenate together as though only one label was given. The DV/LO combinations which permit concatenation are:

Table 23-35

Text Path	Label Origin
DV0 (right)	LO’s 1,2,3, and 11,12,13,21
DV1 (down)	LO’s 3,6,9, and 13,16,19
DV2 (left)	LO’s 7,8,9, and 17,18,19
DV3 (up)	LO’s 1,4,7, and 11,14,17,21

The following two rules determine where the pen is positioned after a label string is drawn. Rule 1 is for DV/LO combinations which permit concatenation; rule 2 clarifies other DV/LO combinations:

1If a concatenation combination is specified, the pen position is updated to give the normal delta X space between the last character of the first label, and the first character of the second label.

Note	For proportional fonts that use a pair-wise spacing table, the pen
	position is updated using an average delta X space.
	2 If a non-concatenation combination is specified, the pen position
	that existed immediately prior to the LB command is restored.

EN LO, Label Origin 23-65