wait - Suspend MATLAB execution until object stops logging
Syntax
wait(GObj)
wait(GObj, TSec)
Description
wait(GObj) suspends MATLAB execution
until the group object GObj has stopped logging. GObj must
be a scalar dagroup object.
wait(GObj, TSec) will wait
at most TSec seconds for GObj to
stop logging. If the group object is still logging when the timeout
value is exceeded, an error message is generated.
The wait function can be useful when you
want to guarantee that data is logged before another task is performed.
You can press Ctrl+C to interrupt the wait function.
An error message will be generated, and control will return to the MATLAB command
window.
Examples
Log 60 seconds of data at 1-second intervals from the Matrikon Simulation
Server's Random.Real8 and Random.UInt4 tags.
Display a message indicating that the acquisition is complete, then
retrieve and plot the data:
da = opcda('localhost','Matrikon.OPC.Simulation');
connect(da)
grp = addgroup(da,'WaitExample');
itm = additem(grp, {'Random.Real8','Random.UInt4'});
set(grp, 'RecordsToAcquire',60, 'UpdateRate',1);
start(grp);
wait(grp)
disp('Acquisition complete');
[itmID,v,q,t]=getdata(grp, 'double');
plot(t(:,1),v(:,1), t(:,2), v(:,2));
legend(itmID);
See Also
getdata | start | stop
 | trend | | write |  |
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