While Loop is very slow for serial reading

[Norick17]

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@pincpanter wrote:

When you set a term char, the VISA Read outputs a timeout error if this char is not there.

As I already suggested, require a large number of characters (e.g. 1000), then check for the error output. If there is no error, you are sure that the term char is there.

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I got it..! Thanks for your answer - this works now with the termination char outside the loop.

[Norick17]

now for 5Hz I get following timestamps:

so the solution are a few points:

- the most impact was the FTDI converter which was set to 16ms. Now I changed it to 1ms. Thanks to @MichaelS78

- use a termination char outside the timestamp loop

- reading more than expected chars and check the error state for the trigger

Those points together gave me the right solution I was looking for. Thanks to all your replies..!!

[billko]

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@Norick17 wrote:

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@pincpanter wrote:

When you set a term char, the VISA Read outputs a timeout error if this char is not there.

As I already suggested, require a large number of characters (e.g. 1000), then check for the error output. If there is no error, you are sure that the term char is there.

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I got it..! Thanks for your answer - this works now with the termination char outside the loop.

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Could we see the new vi (or at least a picture) because what you described doesn't seem to match what was suggested.

[Norick17]

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@billko wrote:

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@Norick17 wrote:

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@pincpanter wrote:

When you set a term char, the VISA Read outputs a timeout error if this char is not there.

As I already suggested, require a large number of characters (e.g. 1000), then check for the error output. If there is no error, you are sure that the term char is there.

---

I got it..! Thanks for your answer - this works now with the termination char outside the loop.

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Could we see the new vi (or at least a picture) because what you described doesn't seem to match what was suggested.

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Here is my last updated vi:

[billko]

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@Norick17 wrote:

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@billko wrote:

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@Norick17 wrote:

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@pincpanter wrote:

When you set a term char, the VISA Read outputs a timeout error if this char is not there.

As I already suggested, require a large number of characters (e.g. 1000), then check for the error output. If there is no error, you are sure that the term char is there.

---

I got it..! Thanks for your answer - this works now with the termination char outside the loop.

---

Could we see the new vi (or at least a picture) because what you described doesn't seem to match what was suggested.

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Here is my last updated vi:

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Yeah, thumbs up.  That should work - at least the comms part of it.  🙂

[pincpanter]

For anyone else looking at this code: to be precise, the first delta t is garbage and will not be considered in the subsequent calculations (that we don't see).