Does Visa have any buffer/memory or similar?

Hi, I have a comunication with 2 radiomodems
via RS232 port, and I get data with VISA in my laptop and have a Visual
Basic program that controls the frames in the other embbedded PC that
sends me frames of an electronic compass and a GPS. The thing is that
in the VB application I can see the correct frame of the compass to be
sent, but the one that I recive in my laptop is not the correct one, in
fact is the one that was sent 30 secs ago so I can't allow that happen
and I have no idea what could be the problem cause radiomodems transmit
correctly and I made another VI program that only reads the frame and
the same thing happened, so I have the thinking that it can be the VISA
command that stores the frame or something similar. By the way, the
compass samples twice per second, and the radiomodem sends that frame
every 400ms. At the beggining, the compass sampled 8 times per second
and I thought it could be the problem but it remains altough I changed
that. What can be happening?
Thank you

Sorry, I wanted to say LF not LP. I tried that and didn't do nothing, the same problem. The good new is that I finally found what was the problem. I have to put a delay of 400ms in my VI application and in the VB application. That did that somewhere, the frames were stored. Now I have changed the delay and put the VISA read inside a while with a condition of 400ms of time so now I recive the frames correctly. The problem I have now is that if I stop the VI application but not the VB one, and let the radiomodem send data, when then I run the program, I have a crazy frame showing that had been storing while the VI was stopped, and if that was for a long time, I get an error in VB because it recives a strange frame from my laptop. So, where could frames be storing while my VI application is sttoped???? Do I have to close the VISA port? I tried to do that, closing the serial port every time I sttopped reading and writing, but I only recive strange characters on frames, so it can't be the solution.
Thanks.
Mensaje editado por CarlosSp

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