Sending And Receiving Data; Computer-To-Plotter - HP 7470A Interfacing And Programming Manual

Sending and Receiving Data
Computer-to-Plotter
Transmitting data from a computer to the plotter is typically accom­
plished using I/O statements such as WRITE, PRINT, PRINT#, or
OUTPUT. The following examples of sending program data to the
plotter from various computers are only intended to illustrate the nec­
essity for understanding the I/O statement protocol implemented by
your computer. Each of these examples will cause the plotter to label the
identity of the computer sending data, beginning at the X,Ycoordinates
1000,2000. The examples involve sending both character string and
numeric data as variables, and constants or literals.
HP 9825 and 9826 HPL Example:
0: Txd 0;d1m H$[13]
1: " SENDING DHTH"+H$
2: 2000+Y
3: S82E+B
4: wrt ?O5,"SP1;PH1000,",Y
5: wtb ?O5,"LBHP",str(E),H$,3
6: end
A terminator is sent by the 9825/9826 at the end of a wrt statement.
Result: HP 9828 SENDING DATA
9826 BASIC Example:
10 PRINTER IS ?05
20 H$=" SENDING DHTH"
30 B=9825
40 Y=2000
50 PRINT "SP1;PH1000,",Y
50 PRINT USING "K";"LBHP ",B,H$,"§"
?0 END
A terminator is sent by the 9826at the end of a PRINT statement.
Result HP 9828 SENDING DATA
HP-IB INTERFACING 9-7