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

Chapter \J
Digitizing
What You'll Learn 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 h a s
been entered. The method you will use will depend on your application
and your interface (HP-IB, HP-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 You Should Understand
Digitizing — converting information, in this case pen position and u p /
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