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HPGL Commands
Initilization
IN
instructs the controller to begin processing the HPGL plot file. Without this, the commands in the
file are received but never executed. If multiple IN commands are found during the execution of the
file, the controller performs a Pause/Cancel operation. All motion from the previous job that has yet
to be executed is lost, and the new information is executed. When the IN command is executed, the
HPGL 3D mode is cleared. The 3D mode can be reset using the ZZ command. A PU command will
be executed before the system executes the first HPGL move command.
ZZ (0,1)
establishes that a value of 0 sets 2D mode and a value of 1 sets 3D mode. In 2D mode, all
commands must have 2 axes, while all commands must have 3 axes in 3D mode.
Motion
PA[X,Y][,Z]
moves to an absolute HPGL position and sets absolute mode for future PU and PD
commands. If no arguments follow the command, only absolute mode is set.
PD[X,Y][,Z]
executes a Pen Down then moves to the requested position, if one is specified. This
position is dependent on whether absolute or relative mode is set. The Feedrate Override knob is
turned ON.
PU[X,Y][,Z]
executes a Pen Up then moves to the requested position, if one is specified. This position
is dependent on whether absolute or relative mode is set. The Feedrate Override knob is turned OFF.
AA X Ctr,Y Ctr,Angle
is a floating point requiring a non-integer value that draws an arc with its
center at X,Y. A positive angle creates a counter-clockwise arc.
ZA Z
moves the Z-axis to the absolute position specified. This feature is for both 2D and 3D modes.
Speed
SF[XY-rate],[Z-rate]
, floating points,
sets the feedrate for the machine tool during Pen Down. All
rates are in mm/sec. The Z rate applies to the plunging feed rate of the Z-axis. In 3D mode, the Z-
axis rate is not used.
Other
SP[ 0, 1, 2, ..., 8... ]
selects a new tool for use. If zero or no pen number is given, the controller
performs an end of file command (EOF). Once an EOF is performed, no motion is executed until a
new IN command is received. Pens 1—8 are spindles, and pens 11—12 are drills.
ZD Z
,
floating point, sets the distance from the surface for the Z-axis to move down on a PD command
(Depth). Changing the ZD value will change the depth on all following PD commands. The value set
with this command is
not
used when running in 3D mode.
ZU Z
, floating point, sets the distance from the surface for the Z-axis to move up on a PU command
(Tool Lift). Changing the ZU value will change the lift distance on all following PU commands. The
value set with this command is
not
used when running in 3D mode.
TC [text]
issues a tool change command. The text following the TC command will appear on the
keypad display at the appropriate time in the tool change sequence. The operator will have the ability
to surface the new tool, change speeds, depths, and the lift. If this information is going to be set by
the file, the appropriate commands must be sent after the tool change command.
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