Hello dear friends of the forum:
The lithium battery has an internal BMS for status monitoring of temperature, current and voltage, and provides protection against over-voltage, under-voltage, over-current, short-circuit, high and low temperature.
At the same time you can report the operating status of the lithium battery and alarm information via the communication interface (CAN/RS485).
If you do not have a monitoring unit (SMU) there is no need to make a connection to the COM port, without the SMU the battery cannot be monitored.
Hope this helps, thanks!