Plotter-To-Computer - HP 7470A Interfacing And Programming Manual

Result: APPLE II SENDING DATA
The PR# 3: IN# 3 statement must be included in each program before
instructions can be sent to the plotter. These statements assume the
IEEE-488 interface card (HP—IB) i s in slot three of the computer. The
string Z$ addresses the plotter at address 5 to listen. It must be
included in every print statement which sends HP-GL commands to the
plotter. The PR# 0: IN# 0 statement directs keyboard output to the dis­
play and must be included before the end of the program or before any­
thing can be printed on the display.
Plotter-to-Computer
Typically, the computer obtains output information from the plotter by
using I/O statements such as READ, INPUT, or ENTER. Sometimes
these statements are available only in I/O ROMS, such as in the
HP Series 80 computers. Check your computer documentation or ask
your HP salesperson to determine if your system requires a special I/O
ROM. The following examples of obtaining output data from the plotter
using various computers are only intended to illustrate the necessity for
understanding the I/O statement protocol implemented on your com­
puter. Each of these examples commands the pen to move to plotter
coordinates X = 1000,Y = 1000 and then output the current pen position
and the plotter identifier string to the computer.
HP 9825 and 9826 HPL Example:
fxd 0;dim H$[5J
wrt ?O5,"PR1000,1000;UC"
red ?05,H,B,C
wrt ?05,"UI"
red ?05,H$
dsp H,B,C,H$
end
U'J(J'l-bl'.aJl\J4C)
Displayed current pen position and identification.
1000 1000 0 7470A
HP 9826 BASIC Example:
10 PRINTER IS 705
20 PRINT "PH1000,1000;UC"
30 ENTER ?O5;H,B,C
40 PRINT "01"
so ENTER ?OS;H$
so DISP H,B,C,H$
?O END
Displayed current pen position and identification.
1000 1000 0 7470A
9-10 HP-IB INTERFACIN G