HP 8112A, Operating, Programming And Servicing Manual

Page: 103 / 406

Without the synchronization with the WAIT command (line 230),
the SPOLL would be conducted whilst "XXX" is being parsed. At
this moment there is neither a syntax error or SRQ active. The
resultant SPOLL would be 1 28, indicating that the HP 81 12A
command buffer is not empty. (See Chapter 6
Error, fault and status
reporting.
10
! Name of this program : SPOLL_2
20
! ----------------------------------------------
30 This program demonstrates that the HP8 1 12A ' s
40
! SRQ is cleared after SPOLL .
50
60
CLEAR SCREEN
70
80
90
100
CLEAR 7 1 2
A=SPOLL (712) Initialize Inteface and HP8 1 12A
clear status byte
1 10 A=SPOLL ( 7 12 )
!
read the status byte with SPOLL
120
PRINT " SPOLL bef ore the syntax error = " ; A
130 PRINT
140 PRINT " XXX is output . This will cause a syntax error . "
1 50 OUTPUT 7 12 ; " XXX"
!
Cause a syntax error .
160
WAIT . 1
!
give HP8 1 12A t ime to receive " XXX" and update the Status Byte
170
180
A=SPOLL(712)
190 PRINT " 1st SPOLL after syntax error = " ; A
200 WAIT . 1
2 1 0 A=SPOLL(712)
220 PRINT " 2nd SPOLL after syntax error = " ; A
230
PRINT
240 WAIT 2
250 A=SPOLL ( 7 12 )
260 PRINT " SPOLL after waiting 2 s econds = " ; A
270 PRINT
280
290
PRINT "End of the program SPOLL_2 . "
300 LOCAL 712
3 10
END
Programming Examples 7-1 1