I have a CommLink, a BatteryPlus35 and a battery monitor. How do I connect all three together with CAN bus cables?

Connect the CommLink to the BatteryPlus35 with the CAN bus cable. Then connect the OdysseyLink to the CommLink. Then connect the battery monitor to the OdysseyLink.

This way, the battery monitor is daisy-chained to the BatteryPlus35 through the OdysseyLink and CommLink.