HP 7470A Interfacing And Programming Manual page 45

will set an error condition but all X,Y pairs which precede the un­
matched parameter will be plotted.
The X—coordinatespecifies, in either plotter units or user units, the
absolute X-location to which the pen will move. The Y-coordinate speci­
fies, in either plotter units or user units, the absolute Y—location to
which the pen will move. If scaling is on, coordinates are in user units.
If scaling is off, coordinates are in plotter units.
The mnemonics PU and PD can be included ahead of, between, or after
X,Ycoordinate pairs. PU lifts the pen; PD lowers the pen.
Any number of coordinate pairs, as well as PU or PD mnemonics, can
be listed after a PA instruction. (This is limited only by the ability of
the controller to output without a line feed character which is an instruc­
tion terminator.) The pen will move to each point in the order given.
Commas, spaces, or a sign are required between numeric parameters
and are optional after two—letter m nemonics. The last entry is followed
by the terminator. In the following examples, commas are used to show
optional and required separators. Optional commas or spaces which
can be used between each letter of the mnemonics are not shown. The
semicolon is used to indicate the terminator.
PA,PD,X1,Y1,PU,X2,Y2,PD,X3,Y3,;
I l I I I I l opnomxt
PU,X1,Y1,PD,X2,Y2,X3,Y3,PU;
I I I I OPTIONAL
PD,X1,Y1,X2,Y2,X3,Y3,;
I I OPTIONAL
If no pen control parameter is given, the pen will assume the pen state
(up or down) of the previous statement. The PU or PD mnemonics can
also be substituted for the PA (or PR) mnemonic. This is equivalent to
having PU; or PD; preceding the PA or PR instruction. Therefore, PU
and PD with parameters are interpreted to be in place of PA or PR,
depending upon which mnemonic, PA or PR, was last specified.
PA is specified by any of the following:
0 power—up,
0 execution of an IN command,
CONTROLLING THE PEN AND PLOTTING 3-5