*OPC?
Syntax
Definition
Related Commands
Example
1
Example
2
Operation complete
query.
If
a sweep is currently driving the instrument, the command parser
prevents any further commands from being processed. When the
sweep stops, ASCII character
'1'
is placed in the output queue and
the instrument processes further commands.
If no sweep is running, ASCII
'1'
is immediately placed in the output
If this command is used carelessly, the instrument may appear to
have entered a "hung up" state because:
Sweeps can be very long, especially in LIST
Continuous sweeps do not stop!
This means that a
Device clear
command or
Selected Device
Clear
command must be sent to the instrument if the succeeding
commands are to be executed (see example below)
The following actions cancel
'OPC? (device goes to Operation
Complete, Command Idle State):
the
dcas
line on the interface is asserted
OUTPUT 70911; "*OPC?"
ENTER70911;A$
PRINT A$
1000
!
E1440A is set at HPIB address 70911
1010
!
(Select code of controller
HPIB
interface card is
7)
1020
!
(Primary
HPIB
address of slot 0 commander is 09)
1030
!
(E1440A logical address
=
88
right shifted
3
bits is 11)
1040
!
1050 CLEAR
7
!
All
instruments connected to bus receive DCL
1060
!
Ov
1070 CLEAR 70911
!
Only the
HP
E1440A receives SDC
5-38
Command
Reference
Artisan Technology Group - Quality Instrumentation ... Guaranteed | (888) 88-SOURCE | www.artisantg.com
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