Do you have to make adjustments to the BUS line?

Yes, it is necessary to terminate the line (termination RC) by placing jumpers on last monitor of the branch. Jumper A1 is for a line that is not terminated, jumper AB is for a 100 ohm-10nF matched line, and the jumper BC for a 50 ohm-10nF matched line (try both options on the monitor in order to verify the best result).