The manual says it is not case sensitive.
That manual is not the best programming manual I have ever seen.
Since you are finding that some things work, you probably will need to work through the command set. Try is as you think the books says it should be. Then try various combinations such as spaces or commas between parameters. \n or \r or \r\n. The manual mentions all of them as terminations. It is quite unclear as to which may be preferred. Set up a Read VI which operates in a loop to see what may be being sent back. The manual indicates that many or maybe all commands generate a response. It also mentions error messages but does not describe them.
While doing this reverse engineering, be systematic and record what you try. What works and what does not work. Also make sure you understand how the instrument works manually. If you send it a command via USB, you want to know how it would have behaved when you told it to do the same thing manually. If if is the same, then you have identified a command that works. If it does something different, you need to figure out why.
Unfortunately, this type of thing is not something where we can much. You have to have the device.
Good luck.
Lynn
