Event/o VISA and viReadAsync - how to use them?

Hello

I am trying to install a handler for IO VISA in my code that will read the data of the TCPIP socket.  The data are to be pulsated in connected equipment.  I did the following successfully:

Opens the default resource manager,

Opens the ethernet device,

Set the attribute to TCPIP NODELAY

Set the timeout for 5000

Installed my manager

Permit in the event of e/s

I now expect this event to launch every time that data of the impulses from the device.  Am I correct in this assumption?

In my event handler, I perform a viRead for the maximum number of bytes that I expect to get.  From what I see the event handler does not run.  I looked for examples of code for this and I can't find nothing explicit.  I read about the viAsyncRead, but I don't want to read until that data is from the device... or am I wrong here, too.  This is my real first shot using VISA with ethernet - in general, I did the serial port RS232 work with a timer async and the Windows entry queue.

All the advice/help is appreciated.

Thank you

Judy

Judy Hello,

You might consider treatment initially interaction with your generic device such as a TCP/IP connection.  This will allow you to specify a callback function in the time you connect, which is triggered in response to a number of events.  One of these events is called TCP_DATAREADY, which seems especially about your situation.  The particular event detected is specified in the parameter to the callback function xType.  In the body of the callback function, you can then run the various VISA features you want.  An example that shows this approach is called a server side finger.cws.  You should be able to find this example by searching in the finder for example CVI for TCP.

Tags: NI Software

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