When you right click on an error out indicator, the first line of the dialog should be Explain Error. In your case, the error means "VISA: (Hex 0xBFFF0015) Timeout expired before operation completed." This can often happen during a VISA Read. If there are no bytes to be read or you ask for more bytes to read than are available, then the VISA Read will eventually timeout. The VISA timeout is settable with a property node so you may have to increase it. Its more likely that you have an incorrect byte count or there are no bytes available for a read. Is this a serial or GPIB instrument? Have you verified the commands you're sending in MAX or anything else?
