KJRH-120F/K Modbus RS485

Hello everyone
I have problem with connection kaisai heat pump to the HA via modbus.

Based on manual h1 and h2 should be responsible for modbus

Using waveshare RS485 to ethernet

I did connect h1 to B and h2 to A but i am not able to see anything in waveshare orQmodmaster only rx count if trying to read data via qmodmaster but no tx or anything from Control unit

Any advice please?
Thanks