I did not mess with any jumpers… Leave them as they came.
You must provide +12 and ground to the boards or they will not work.
You must have a 120 ohm resistor between the CANBUS lines or it will not work.
The ET7190 board is just an interface, it does not have any program logic on it to be able to run on its own so you MUST have it connected to a computer running their software (or your own) through the USB port. There may be other methods to connect to the board but I only use the USB connection and use their default setup.
Note that my boards are currently only used for my Development of M2 software. Which I should be getting back to within the next week.