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5.5
Synchronization with the
Controller
Overlap Commands and Sequential
Commands
There are two types of commands, overlap commands
and sequential commands. In the case of overlap
commands, the execution of the next command may
start before the execution of the previous command is
completed.
For example, if the next program message is
transmitted when specifying the voltage range and
querying the result, the response always returns the
most recent setting (100 V in this case).
:INPut:VOLTage:RANGe;ELEMent1 100V;
ELEMent?<PMT>
This is because the next command is forced to wait
until the processing of
"INPut:VOLTage:RANge:ELEMent1" itself is
completed. This type of command is called a
sequential command.
On the contrary, let us assume that you send the next
program message when you wish to load a file and
query the voltage range of the result.
:FILE:LOAD:SETup "FILE1";:INPut:VOLTage:
RANGe:ELEMent1?
In this case, ":INPut:VOLTage:RANGe:ELEMent1?"
is executed before the loading of the file is completed,
and the voltage range that is returned is the value
before the file is loaded.
The act of executing the next command before the
processing of itself is completed such as with
"FILE:LOAD:SETup" is called an overlap operation.
A command that operates in this way is called an
overlap command.
In such case, the overlap operation can be prevented
by using the methods below.
IM 760301-17E
5.5 Synchronization with the Controller
Synchronizing with Overlap Commands
Using the *WAI Command
The *WAI command holds the subsequent commands
until the overlap command is completed.
Example :COMMunicate:OPSE
#H0040;:FILE:LOAD:SETup
"FILE1";*WAI;:INPut:VOLTage:
RANGe:ELEMent1?<PMT>
"COMMunicate:OPSE" is a command used
to select the "*WAI" target. Here, media
access is specified.
Because "*WAI" is executed immediately
before
":INPut:VOLTage:RANGe:ELEMent1?,"
":INPut:VOLTage:RANGE:ELEMent1?" is
not executed until the loading of the file is
completed.
Using the COMMunicate:OVERlap command
The COMMunicate:OVERlap command enables (or
disables) overlap operation.
Example :COMMunicate:OVERlap
#HFFBF;:FILE:
LOAD:SETup
"FILE1";:INPut:VOLTage:
RANGe:ELEMent1?<PMT>
"COMMunicate:OVERlap #HFFBF"
enables overlap operation on commands
other than media access.
Because the overlap operation of file
loading is disabled, "FILE:LOAD:SETup"
operates in the same way as a sequential
command. Therefore,
":INPut:VOLTage:RANGe:ELEMent1?" is
not executed until the loading of the file is
completed.
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App
Index
5-7
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