Howto write 0x06 to temp+hum sensor

[Gajusbonus]

I bought a temp+hum sensor at aliexpress and connected this to Domoticz.
Success in reading temperature but unable to find the settings to read humidity.
Tried serveral hours all different settings of the GUI
According to the description it needs a modbus write signal:
In order to read temp+humidity:
Host (TX): 01 03 00 00 02
Client (RX): 01 03 04 XX XX XX XX
See product link https://nl.aliexpress.com/item/1005004789059185.html?gatewayAdapt=glo2nld
How do I set the GUI to send the right command?

[Gajusbonus]