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PSI BOX Reference
_______
Mode 8.
Function: An RS232 input to IEEE output interface with
IEEE talk back and RS232 flow control.
Use:
Driving a IEEE plotter from the serial RS232
port of a computer so that it completely simulates
an RS232 plotter.
Example: HP 7475 IEEE plotter from RS232 port of a PC
running LOTUS 123, AutoCAD etc.
Summary.
_________
Many
Language, HPGL, amongst these are HP's RS232 7475 and
IEEE 7475 plotter. There are three essential types of operation
that RS232 HPGL plotters perform.
1)
Execution of HPGL plotting commands.
2)
Reply to HPGL OUTPUT commands.
3)
Response to RS232 interface Flow Control commands.
__
1)
___________________________________ _
Execution Of HPGL Plotting Commands.
Most HPGL commands are concerned with positioning and
selecting pens, plotting shapes and specifying line thickness, pen
speeds etc. These HPGL commands are routed from the host
computer directly to the plotter for execution. The PSI BOX
buffer, in conjunction with any buffer in the plotter, are used to
accept as large an amount of data from the computer as quickly
as possible thus freeing up the computer for other processing.
__
2)
_______________________________ _
Reply To HPGL Output Commands.
The HPGL specification allows plotters can be asked to
output to the computer various information. This includes the
pens current coordinates, size of the drawing window, error
states, plotter identification information etc. Several of the output
commands are listed below.
Page 64
plotters
understand
Modes 1-6 & 8.
Hewlett
Packard
Graphic
Chapter 6
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