How can use VISA Read and the Wait Function properly

[J.O.]

I am trying to read an instrument. The is a simple instrument because all it does is feed data; there aren't not any write commands whatsoever. I am trying to read the instrument in time intervals. It seems to work fine except for the one second interval. Every 5 seconds I don't get reading and there are zero bytes at the serial port. Any suggestions on what I should do?

[Odd_Modem]

One suggestion, don't try to read zero bytes.

[unclebump]

There is a Visa serial VI called VISA Bytes at Serial port. Use a comparison node for =0 and wire this to a case structure. In the false case, read your data.