One of my application is to use USB bulk out to write a hex number to a circuit board that has a USB interface. I use one of the example (USBRawBulkMain.vi) that I downloaded online from ni.com. to communicate to the board. Everything works, except if I enter a HEX number string on front panel after open session. What I receive on the circuit board side is the ASCII code of that HEX character. For example, if I send HEX number "FF", I got "46 46" instead of FF. My question is how I can send a HEX number using VISA write Vi. since it only takes string input. I already tried to send 0xFF but LabVIEW still treats the HEX number string as character.