TCP details please
Well, I know it's more a general TCP issue than a question of LabVIEW but I'll ask anyway since it doesn't seem to be a good documentation on the Web on TCP Windows, especially some layer LabVIEW Windows calls do TCP.
Is anyone out there can explain what is happening behind the scenes when doing TCP read/write with LabVIEW? Suppose that 'immediate' or 'standard' mode is used and there is no buffering LabVIEW place for data. In fact, what triggers the data to travel over the network? Reading or writing? There is of course a buffer of allocated fixed size somewhere at a level bottom - is it used by the side of the reading or the writing side or both? What is the default size of the TCP buffer? 4 KB? When that buffer fills up, I guess that's when the time-out "Write" comes into play?
So in summary, I am looking for a basic "tutorial" on how TCP data transfer is managed under the layer of LabVIEW.
Under windows, LabVIEW uses the winsock2 (WS2_32.dll).
http://msdn.Microsoft.com/en-us/library/ms740673 (Vs.85) .aspx
It seems that the default size of the TCP buffers on Windows XP is 17 520 bytes.
Default LabVIEW leaves the send and recv sizes only buffers (by default the operating system). If you want to refine them you can use the tokens of the ini
SocketSendBufferSize and
SocketRecvBufferSize
The values of these tokens apply to all sockets using LabVIEW.
The default values of the BONE are almost always the best choice. It's really easy to destroy the network of LabVIEW performance by fiddling with these values.
Tags: NI Software
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