Modbus RS485 read errors?

Hello
would need some hlp pls, to understand, where is my fault, thx!

reading via RS485/USB Adapter from a BMS Batterypack.
connected are 1/8 2/7 (no ground - does have a problem on pack off getting voltage)
pallette @kenke7/node-red-contrib-modbus

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first I get the value, then nothing anymore?

THX


changed wiring, only 1 B and 2 A is connected, no change

sometimes I get values, most not, where is the problem ?

I always get an error message with expected x and got "9", is that something of interest?

this is the doc I am following from manufacturer

it seams there is something fixed to "9" ?
tried address:0 quantity: 1

address: 0 quantity: 2


851 = 8,51A
5364 = 53,64V
these values are correct

maybe this is the hint:

this is just the 8 data bits and 1 stop bit or?

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