Control Functions - HP 7470A Operator's Manual

The pinch wheels and grit-covered drive wheels that move the paper
back and forth across the platen are spaced to accommodate either
ANSI A or ISO A4 size media. The paper loading lever which raises
and lowers the pinch wheels is located on the left side of the platen.
The operating controls and error indicator are grouped on the front
panel at the right side of the plotter. Configuration and interface
controls are located on the rear panel.

Control Functions

In addition to the
are three categories of operator controls: front panel, configuration, and
interface.
Front-panel controls are used to manually control pen and paper
movement and to change the locations of scaling points Pi and P2.
They can also be used for interaction with a running program. This
interaction includes entry of digitized points, pen selection, and pro­
gram suspension without loss of data. The ability to pause a running
program allows pen substitution in multicolor applications. The medium
is also fully extended in this state to permit viewing of the entire
plotting area.
The plotter has only one configuration control. This switch limits pen
movement to an area suitable for either ANSI A or ISO A4 size media.
The switch is located on the rear panel and is common to all three
plotter interface options.
Interface controls establish the conditions under which communication
between the plotter and computer will occur.
All operator controls, including the controls on each interface option,
are shown in the following illustration. A description of each control,
including its function, is keyed to the illustration on page
Front Panel
1.
power switch and paper loading lever, there
LINE
-
Moving the paper loading lever to the
position turns on the
LOAD r
raises the pinch wheels to permit loading the
plotting medium. Raising the pinch wheels
also returns any pen currently held in the pen
holder to the pen stall from which it was
selected. This avoids getting ink on the new
paper and automatically caps the pen to pre­
vent it from drying out.
10.
PAPER
light and
ERROR
7