The Plot Absolute Instruction, Pa - HP 7470A Interfacing And Programming Manual

A default instruction, DF, or an initialize instruction, IN, will also reset
the velocity and acceleration to the values 38.1 cm/s and 2 g.
The Plot Absolute Instruction, PA
DESCRIPHDN The plot absolute instruction, PA, moves the pen to the
point(s) specified by the X— and Y-coordinate parameters.
M The instruction can be used together with PD to draw lines or
with PU to move the pen to a specific point on the plot. The instruction
can be executed without parameters to establish absolute plotting, as
opposed to relative plotting for PU or PD commands with parameters.
In this case, the parameters of PU and PD are interpreted as absolute
X,Ycoordinates until any PR command is received.
PA X1coordinate,Y1 coordinate (,X2 CO0I'dinate,Y2
coordinate,...,Xn coordinate, Yncoordinate)(terminator)
or
PA (terminator)
EXPLANATIONRecommended parameters are decimal numbers be­
tween —32768.0000 and 32 767.9999. When scaling is off, parameters
are truncated to integers as follows:
0 For positive numbers, the fractional portion is discarded and the in­
teger portion remains unchanged. For example, both 1234.4 and
1234.9 become 1234.
0 For negative numbers, the fractional portion is discarded and the in­
teger portion is changed to the next more negative integer. For ex­
ample, both —1234.4and -1234.9 become -1235. Since you cannot
plot to negative values unless scaling is on, (in which case decimal
portions of parameters are used), the only time you will observe this
is when you use the output commanded position and pen status
instruction, OC, and the last X-and/ or Y-parameter sent was negative.
NOTE: If you have an HP-IB or RS-232-C plotter that has the serial
prefix number 2308A, or higher, or if you have an HP—IL plotter, you will
not observe this truncation with the OC instruction. In these plotters,
the OC instruction returns decimal parameters instead of integer
parameters when scaling is in effect.I
When scaling is on, any fractional portion of a parameter is used.
A PA command without parameters sets absolute plotting mode for PU
and PD commands with parameters.
When parameters are included with a PA command, both coordinates
of an X,Ycoordinate pair must be given. An odd number of parameters
3-4 CONTROLLING THE PEN AND PLOTTING