Chapter 6: Digitizing; What You'll Learn; Hp-Gl Instructions; Terms You Should - HP 7470A Interfacing And Programming Manual

Chapter
Digitizing
What You'llLearn in This Chapter
The plotter can be used as a digitizer as well as a plotter. Digitizing
consists of moving the pen or digitizing sight to a point on the plotting
surface, entering the point, and sending the coordinates of that point to ~
the computer. This chapter describes the three instructions used in
digitizing, and contains a discussion of the steps required by a computer
program for digitizing; sample programs are also included. Included in
the discussion are three different methods of assuring that a point has
been entered. The method you will use will depend on your application
and your interface (HP—IB, H P-IL, or RS-232-C).
HP-GL Instructions Covered
DP The Digitize Point Instruction
DC The Digitize Clear Instruction
OD The Output Digitized Point and Pen Status Instruction
Terms YouShould Understand
Digitizing —converting information, in this case pen position and up/
down status, to digital information so that it can be understood by the
computer.
Output Terminator —the character or characters sent by the plotter at
the end of the response to an output command. It is interface-dependent.
DIGITIZING 6-1