HP 7470A Interfacing And Programming Manual page 82

The instruction can be used to change the direction of lettering
from its default direction, horizontal, to a direction which is relative to
P1,P2 settings. It is useful when creating graphs which will be plotted
in several sizes and you want labels to have the same relationship to
the data on all plots.
SYNTAX DR run, rise terminator
or
DR terminator
EXPLANATIONRun and rise are in decimal format, 0 to i127.9999,
and specify the label direction according to the same relationship
specified in The Absolute Direction Instruction, DI.
Run and rise specify a percentage of the algebraic distance between P1
and P2 where run is the desired percentage (-128 to 127.9999) of
P2x —Plx , rise is the desired percentage (-128 to 127.9999) of P2y —Ply,
and P1 and P2 are the scaling points.
If you imagine the current pen position to be the origin, the sign of the
parameters determines in which quadrant the lettering will be. In the
example below, rise and run assume all combinations of i1 with
default P1 and P2.
—RUN (o'9& 'fig' +RUN
+RISE ('O 0 +RISE
:2 'O 01,9 :2
6,55 6%
V\O"\' 04/
A change in P1 or P2 will affect the direction of lettering. Refer to the
section Parameter Interaction in Labeling Commands.
A DR command remains in effect until another DR or DI command or
an IN or DF command or front-panel initialization is executed.
A DR command with no parameters will default to the values DR 1 , 0
(horizontal).
5-12 LABELING