The bus is an enormous 50-seater with 20 five-feet-long bunks crammed above the seats. It has the narrowest of walkways and is as claustrophobic as a battery hen cage.
While an interface from the battery system to the main can bus may be desirable, SPI or I2C communications can be advantageous within the battery pack.
尽管从电池系统到主CAN总线有一个接口也许是可取的，但在电池组内部，SPI或I2C通信是有利的。
3
A single microcontroller controls the entire stack of battery monitors via the SPI-compatible serial interface, and it also is the gateway to the main CAN bus.