Termination Resistors; Can Bus Power - Whisper Power Power Plus User Manual

22 WhisperPower Lithium Power Plus 12 V 105 Ah

4.7.2. Termination Resistors

The CAN bus requires termination at the two ends of the bus. The USB-to-CAN interface
may be connected in anywhere to the CAN bus.
Use termination resistors at the end nodes to prevent reflections on the line. The value of
this resistor should be +/- 120 ohms.

4.7.3. CAN bus power

Due to the galvanic separation between the BMS and the Lithium Power Plus batteries
CAN interface an external power supply is needed on the CAN bus.
The CAN bus can be powered through the CAN power cable. (figure 9)
This situation may occur when a USB-to CAN interface is directly connected to the Lithium
Power Plus battery.
When using the BCI with 1 Lithium Power Plus battery, the CAN power cable is required.
When using the BCI with 2 to 16 Lithium Power Plus batteries, the CAN power cable isn't
required. The power is provided by the BCI.
Figure 9. Use Con2 to power the CAN bus