Plug the device into a computer and see what comes out. You may have to install an FTDI driver. Also you need a program that dumps serial data in HEX. Ubuntu Linux (and maybe other distros) come with FTDI drivers pre-installed. Install a program named cutecom (sudo apt install cutecom). cutecom is a terminal program but it works in binary/HEX. Very handy for troubleshooting serial devices with binary protocols. Or write a program in some easy scripting language such as Python to read/write the serial port.
Luckily the IMU comes with a "Manager" MT Manager. It lets me see the output from the IMU on a GUI interface. It also lets me change the configuration without having to do it manually by sending bytes. So you may be right in saying that I might just be able to listen, once configured correctly in the manager.
Another aspect of the manager is the ability to send arrays of bytes, like I am attempting to do over the arduino. I am attempting to send and the receive. It works on the PC. I know that the chip is a FT232, so the drivers should work.
If other attempts have been made to configure the device, it may be stuck at a baud rate other than 115200. See if the device has a factory reset button. The last resort is to try every available baud rate until some reasonable data comes out.
Per the documentation the baud rate is automatically set at 115200 unless I change it. I also placed it there in the manager. I did try the other baud rates, and received nothing.
The sketch you posted is not very useful because it sends an invalid command "DEADBEEF" that might confuse the device. I suggest not sending anything and just see what comes back. The device is supposed to send measurements if it does not receive any commands. The protocol is in binary so print HEX.
I understand, that was not my attempt. That was the starting example given by the creators of the library. Was simply giving it so you could see the functions he implemented and maybe knew how to correctly use them, since its possible I am just using them incorrectly.
Unfortunately your code did now work even after configuring the IMU to output in the MT manager. I feel like either I am having a huge mishap with using the drivers correctly, or what I am doing is not possible with my current library.