HP 7475a, Operation And Interconnection Manual

Page: 23 / 101

Coordinate System Orientation
The location of the coordinate origin (0 , 0 plotter units) and the orienta­
tion of the
X·
and Y·axis with respect to A and A4 or B and A3 paper
sizes are shown in the following diagrams. Hard-clip limits and the
approximate default locations of scaling points PI and P2 are also
shown. All of these default conditions are determined by the settings of
the
US/MET
and
A4/A3
switches when plotter power is first turned on.
Hard-Clip Limits
The hard-clip limits determine the maximum limits of the pen's motion
and the area within which scaling points PI and P2 can be positioned.
Except for narrow margins which are required by the grit wheel paper­
moving technology, the hard-clip limits allow plotting on the entire
paper surface. The following table shows the maximum plotting range,
in plotter units, for aB four paper sizes. Note that the plotting ranges in
the X- and Y-axis are reversed when the 90-degree rotate function is
turned on. Refer to Rotating the Coordinate System in this chapter.
NOTE:
The power-up default input window is coincident with the hard­
clip limits. The size of the input window can be changed using the HP­
GL instruction, lW, to programmatically limit the pen's motion
.•
+y
(DEFAUL
'V
HARD-CLlP
L
I
LIMITS
,
' + X
I
,
,
,
,
0,0 ORIGIN
Default Orientation of Plotter Coordinate System (AI A4 Paper)
PLOTIER OPERATION
2-5