Section 10: Instrument programming Model 2601B-PULSE System SourceMeter Instrument Reference Manual
10-56 2601B-PULSE-901-01A April 2020
Using the data queue for real-time communication
Nodes that are running test scripts at the same time can store data in the data queue for real-time
communication. Each instrument has an internal data queue that uses the first-in, first-out (FIFO)
structure to store data. You can use the data queue to post numeric values, strings, and tables.
Use the data queue commands to:
• Share data between test scripts running in parallel
• Access data from a remote group or a local node on a TSP-Link
®
network at any time
You cannot access the reading buffers or global variables from any node in a remote group while a
node in that group is performing an overlapped operation. However, you can use the data queue to
retrieve data from any node in a group that is performing an overlapped operation. In addition, the
master node and the group leaders can use the data queue to coordinate activities.
Tables in the data queue consume one entry. When a node stores a table in the data queue, a copy
of the data in the table is made. When the data is retrieved from the data queue, a new table is
created on the node that is retrieving the data. The new table contains a separate copy of the data in
the original table, with no references to the original table or any subtables.
You can access data from the data queue even if a remote group or a node has overlapped
operations in process. See the dataqueue commands in the TSP command reference (on page 11-1)
for more information.
Copying test scripts across the TSP-Link network
To run a large script on a remote node, copy the test script to the remote node to increase the speed
of test script initiation.
The code in the example below copies a test script across the TSP-Link
®
network, creating a copy of
the script on the remote node with the same name.
-- Add the source code from the script
-- testScript to the data queue.
node[2].dataqueue.add(testScript.source)
-- Create a new script on the remote node
-- using the source code from testScript.
node[2].execute(testScript.name ..
"= script.new(dataqueue.next(), [[" .. testScript.name .. "]])")
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