LabVIEW is randomly down 4 or 5 bytes from front of sequential readings

I posted this topic in the forum, VISA, but there seems to be no traffic, and this seems to be a problem of software anyway. I have a serial device that is supposed to echo all commands and then send it to arrive at an answer firther. My problem is that LabView is declining the first 4 or 5 bytes for the echo, and there is no clear reason for whether it is 4 or 5 bytes. Using a terminal I get the response you want:

$ echo - en "\xFA\x30\x4\x43" >/dev/ttyr02

$ od - x<>
0000000 30fa 4304 30fa 4304 30fa 050 has 2e06 010 a
0000020 9478

It did the right thing at the level of the operating system, but Labview still refuses to read the first 4 / 5 bytes. Someone saw something similar in the past? I'm pulling out my hair. The thing is, I can use LabView to write random bytes to a serial port, reading from each other by a null-modem cable, and everything I write comes back fine. Therefore, there is no consistency. Is 0xFA one kind of specificity of who I should be aware?

Have you tried thw VISA writes and reads the synchronous value?  as a use of emulators or Terminal?  Click with the right button on the functions, and then select Setup (the clock in the icon should disappear.

And the FA would be 4 of those to get attention followed by 1010 for recovery of clock on the end

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