Keithley 2651A - Dataqueue.next()

Model 2651A High Power System SourceMeter® Instrument Reference Manual Section 7: Command reference
2651A-901-01 Rev. A / March 2011 7-41
Also see
dataqueue.add() (on page 7-38)
dataqueue.CAPACITY
(on page 7-39)
dataqueue.clear()
(on page 7-39)
dataqueue.next()
(on page 7-41)
dataqueue.next()
This function removes the next entry from the data queue.
Type TSP-Link accessible
Affected by Where saved Default value
Function Yes
Usage
value = dataqueue.next()
value = dataqueue.next(timeout)
value
The next entry in the data queue
timeout
The number of seconds to wait for data in the queue
Details
If the data queue is empty, the function waits up to the timeout value.
If data is not available in the data queue before the timeout expires, the return value is nil.
The entries in the data queue are removed in first-in, first-out (FIFO) order.
If the value is a table, a duplicate of the original table and any subtables is made. The duplicate table does not
contain any references to the original table or to any subtables.
Example
dataqueue.clear()
for i = 1, 10 do
dataqueue.add(i)
end
print("There are " .. dataqueue.count
.. " items in the data queue")
while dataqueue.count > 0 do
x = dataqueue.next()
print(x)
end
print("There are " .. dataqueue.count
.. " items in the data queue")
Clears the data queue, adds ten entries, then
reads the entries from the data queue.
Output:
There are 10 items in the data
queue
1.00000e+00
2.00000e+00
3.00000e+00
4.00000e+00
5.00000e+00
6.00000e+00
7.00000e+00
8.00000e+00
9.00000e+00
1.00000e+01
There are 0 items in the data queue