Why serial read don´t read all bytes i request

Hi,
my problem is, bytes at port say, that there are 207 bytes. When i call the VISA read VI, and wire the bytes to read Input with the bytes at port, the do not read all 207 bytes. they read a random number between 27 and 150 bytes.
can anyone tell me what i am doing wrong.
Thanks Florian

Hi,
here is my VI, i send a command to the device and the device sends 207 bytes back, but the serial reads read not 207 bytes at the same time.
Attachments:
serial.vi ‏91 KB

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