Why convert? What is the advantage? Why convert it before you send the data over the network?

Hello everyone.

I have a question quite simple and intuitive. Yet Google does not seam to get the answer.

Basically, I'm curious why should we catalogued something? It seems to me that it's just a little like a "band-aid" for editing data in conversion to a new data type, when it is not properly declared with an appropriate data type. What would be the advantage of this?

Furthermore, I see a lot of data type casting to U8 programs before sending it over the network. Various reviews say it's for speed, but I can't understand how it improves speed. The same amount of data is still sent, just in a different type of data. This is overcoming a limitation of the network. The network somehow send smaller data types faster?

I've been curious about this for a while and have yet to find an answer. Any help is appreciated.

Thank you
Taylor S. Amarel

tsa256 wrote:

Basically, I'm curious why should we catalogued something? It seems to me that it's just a little like a "band-aid" for editing data in conversion to a new data type, when it is not properly declared with an appropriate data type. What would be the advantage of this?

It really depends on the specific situations.

For example, some functions explicitly require certain types of data as inputs if they are not polymorphic.

This means that if you do not convert the data yourself and you will see a red dot forced LabVIEW will do it for you.

As to why the data was not the correct data type in the first place, it is sometimes inevitable.

A few examples

-What happens if you just read a text file as a long string.

If there is digital data in this file, you need to analyze, and then convert it to a usable type (int, sgl, dbl, etc.)

-you are given a 3rd part VI, dll, etc. that returns a numeric value as a double, but you need the value to I8.

You cannot change the output of the function given to you, so what you can do to remedy this situation is cataloged data.

tsa256 wrote:

Furthermore, I see a lot of data type casting to U8 programs before sending it over the network. Various reviews say it's for speed, but I can't understand how it improves speed. The same amount of data is still sent, just in a different type of data. This is overcoming a limitation of the network. The network somehow send smaller data types faster?

Somehow, this is my first response, but in a more general sense.

Many functions down to the level of the OS run in binary.

If your data are not already in binary, the sending computer must convert it to binary, and then send it, have the receiving computer convert in return.

Two conversions on each side of the transmission add unnecessary delays.

Tags: NI Software

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