HP 7470A Interfacing And Programming Manual page 95

mirroring and any negative parameter cancels mirroring. This can be
seen in examples 12, 13, and 14.
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P2
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Use of DR and SR
When the DR and SR instructions are used together, interactions are
most complex. Using only standard settings of P1 and P2, where P1 is
the lower—left corner and P2 is the upper-right corner, will make it easier
for you to establish the direction and mirroring of labels you desire. DR
parameters interact with the albegraic differences (P2);—Plx) and
(P2y —Ply) to establish label direction, and SR parameters interact
with these differences to create mirroring. Signs of both parameters
and differences are important. A negative sign in either the parameter
or the distance will affect both DR and SR commands. Having both
parameter and distance either positive or negative will cause standard
direction or no mirroring.
LABELING 5-25