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problemas con el puerto serie....
Do you get any error messages?
Could it be that the port is still in use by other software?
I recommend to watch Tim's presentation about serial communications.
You are writing to the device, checking bytes at port a nanosecond later when nothing has come back yet, then obviously read nothing. Does your data have a termination character? Use it!
Why not place an indicator at the "bytes at port" wire? Why not create an error indicator inside the loop? What is the value of the control named "Numeric"? What's in the string wired to the write function? Why do you call the output "data in"? Good programming starts with giving terminals reasonable names!
So what is the message protocol that you are sending on the other end? Is that device sending the data with a termination character? For Arduinos, that is done for you if you use the Serial.WriteLn() command (it appends the line feed). If that is the case, then get rid of the Bytes At Port and just tell the VISA Read to read more bytes than you ever expect in a message (I tend to use 50, my generic library uses 1024). This will allow your VISA Read to read the entire message. This will also remove the need for the wait inside of the loop.
