Inverter Data logger serialport RS232 decode unknown encoding

Hi

I have taped into my inverters rs232 rx port hand have recorded what data a data logger send, replicating these recording to the inverter gives me a response from the inverter but I have no idea what the return string means.

Things have notice
-bit one of the binary buffer is always 1 in decimal (send/receive)
-bit two is always 3(send/receive)
-bit five of the binary buffer I send is always 0 (but I have only 14 strings I can send so this might be irrelevant)
-all the binary buffers I send contains 8 bytes

The inverter is a Sunsynk 5k and around the world there there are similar inverts rebranded as Deye or Sol-ark.

I need help how to understand/decode the data I send and receive.

Thanks
Frans

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A screenshot of the flow

A quick google search confirms, that these inverters - as many/if not all - do "speak" a ModBus protocol.
Here you can find a manual/spec documents as it seems: Sol-Ark - Inverter Monitoring | DIY Solar Power Forum

You can use node-red-contrib-modbus nodes to access the inverters.
I suggest to start from there instead of trying to parse the buffer-protocol yourself.