Here you can find an PowerShell Script reading the telemetry values of a JBD BMS
It uses COM7, and a baud rate of 9600, but can be adjusted to your needs

The output of the script is:

Paket 3: Spannung 26.28V Strom -10.9A SOC 90%
Paket 4: 3,286 3,288 3,26 3,286 3,285 3,263 3,287 3,296 deltaV: 36mV

It provides information such as:
- Battery Voltage
- Charge/Discharge Current
- Battery State of Charge SoC
- all individual cell voltages
- delta V of all cells

PowerShell code as text file