HP 8112A Operating, Programming And Servicing Manual page 103

IO ! Name of this program: SPOLL-2
2 0
3 0 ! This program demonstrates that the HP8112A's
4 0 ! SRq is cleared after SPOLL.
5 0 !
6 0 CLEAR SCREEN
7 0 CLEAR 712
8 0
9 0 !
100 !
110
120 PRINT "SPOLL before the syntax error
130 PRINT
140 PRINT "XXX is output. This will cause a syntax error."
150 OUTPUT 712;"XXX"
160 WAIT .I ! give HP8112A time to receive "XXX" and update the Status Byte
170 !
180
190 PRINT "1st SPOLL after syntax error = ";A
200 WAIT .I
210
220
PRINT "2nd SPOLL after syntax error = ";A
230 PRINT
240 WAIT 2
250
260 PRINT "SPOLL after waiting 2 seconds =
270 PRINT
280 !
290 PRINT "End of the program SPOLL,2."
300 LOCAL 712
310
END
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 128, indicating that the HP 8112A
command buffer is not empty. (See Chapter 6 Error, fault and status
reporting.
! Initialize Inteface and HP8112A
! clear status byte
! Cause a syntax error.
-m-e---
Programming Examples 7-11