Chapter 7: Obtaining Information From The Plotter; What You'll Learn In This Chapter; Hp-Gl Instructions Covered; Terms You Should Understand - HP 7470A Interfacing And Programming Manual

Chapter
Obtaining Information
from the Plotter
What You'll Learn in This Chapter
Up to this time we have mainly been concerned with sending informa­
tion or data to the plotter. Sometimes, however, we want to know some­
thing about the plotter, its current pen position, its status, whether a n
error h a s occurred, or what capabilities the plotter has. In this chapter
you will learn about most of the plotter's output instructions. The out­
put PI and P2 and output window instructions are discussed in Chapter
2 and the output digitized point instruction is discussed in Chapter 6.
All other output instructions are discussed in this chapter. The timing
of output depends on your interface (HP-IB, RS-232-C, or HP-IL). Before
using the output instructions, you should have read the notes below
and the appropriate interfacing chapter in this manual.
HP-GL Instructions Covered
OA The Output Actual Position and Pen Status Instruction
OC The Output Commanded Position and Pen Status Instruction
OE The Output Error Instruction
OF The Output Factors Instruction
01 The Output Identification Instruction
0 0 The Output Options Instruction
OS The Output Status Instruction
Terms You Should Understand
Output Terminator — denoted in this manual as [TERM] — the ASCII
character or characters sent by the plotter at the end of a plotter re­
sponse to an output command. With an HP-IB or HP-IL interface, the
two characters, carriage return and line feed, are the output terminator.
With an RS-232-C interface, the output terminator is a carriage return,
unless modified by an ESC . M command.
OBTAINING INFORMATION FROM THE PLOTTER 7-1