I'd say you were unsuccessful in using the I/O Assistant since you get a timeout error. A timeout error occurs when there is no data to be read from the device and this is often due to the fact that you are not sending the data in the correct format. How are you configuring it to send the data in hex? Instead of the I/O Assistant, I would recomend that you using one of the shipping examples for serial communication. Both have a string control that you can right click on and set for Hex Display. Enter the data there and do a write. If the data returned is hex, then you need to set the string indicator for hex display as well. Instead of string controls and indicators, you can also use a U8 array control and the Byte Array to String for the data to be sent. With the string returned by the VISA Read, you would then use the String to Byte Array function.
