Serial Communication ERROR

[Fluktuation10111]

Hello

I am a complete beginner with Labview. My task is to control a device which is on COM-Port 4

It has the following properties:

I know how the device normally responds to Input, in MATLAB i simply send the string "!0XFFFFFFFFFFFFFFFF" and when i read the output i get the response "Data shifted, output latched, flags are cleared"

However, when i implement this in Labview i get the Error (from my Communication Device)

Note that these are two separate lines, but in Labviews i need to read twice to display this entire message (for some reason)

and this error (from the error channel): 0x3FFF0006 (https://knowledge.ni.com/KnowledgeArticleDetails?id=kA00Z000000P8BmSAK&l=de-DE)

As i understand it the amount of transmitted data is equal to the requested amount of data, but there is more data, as a result i get a FIFO overflow, which also is a error message i get: "ERROR in UART-RX-Callback: FIFO overflow" and then " FIFO is now empty, flags are cleared"

Here is a screenshot of my VI (the file is also included) 

Does anyone have an idea why i get this I/O error?

[RTSLVU]

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@Fluktuation10111 wrote:

Does anyone have an idea why i get this I/O error?

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Probably because you are using "Bytes At Port".

I suggest you watch this video VIWeek 2020/Proper way to communicate over serial

[garthenar]

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@Fluktuation10111 wrote:

I know how the device normally responds to Input, in MATLAB i simply send the string "!0XFFFFFFFFFFFFFFFF" and when i read the output i get the response "Data shifted, output latched, flags are cleared"

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I'm new myself but I think I'm working on a similar problem.If anyone on here corrects me, listen to them (I know I will).

It might be that the message your trying to communicate is supposed to be in binary and as a result the device isn't getting the message you think it is and therefore isn't sending the response you normally get in MATLAB.

I working though something similar right now so I don't have the answer but here are the materials I've gathered.

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NI Link

https://root.cerhttps://knowledge.ni.com/KnowledgeArticleDetails?id=kA00Z0000019MGcSAM&l=en-USn/

A good, though very old, forum link.

https://forums.ni.com/t5/LabVIEW/Writing-binary-data-on-serial-port/td-p/3086?profile.language=en

The video RTSLVU posted. (It's a great video. As a LabVIEW beginner I absolutely love that video.)

And Rapidtables has several good binary/hex/ASCII/etc. converters that I like to use with large strings.

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Good luck. I'll be monitoring this post as well to learn from what anyone else puts down.

[crossrulz]

What device are you trying to communicate with?  Do you have the specifications on the command structure?  I really need a lot more information like the protocol in order to give any actual advice.