BMS: JBD UP16S010 Decoding based on firmware version 13.2.4
Commands can be sent via the RS485-1 port or by te RS232 port (9600baud, N81)
CRC calculation: crc16 with initial_value=0xffff and polynomial=0xa001, LSB 1st
The Modbus data-frames are generally MSB-1st except for the CRC. The CRC is calculated from the entire frame (minus the crc itself)