Connection the USBDM device.
Below is the pinout of one of the most popular USBDM devices.
Most users use the so-called sub-soldering to the desired points. However, I believe that this is not very convenient and I prefer the option of connecting with "crocodiles".
The power is supplied to the service connector (for the Merloni key).
Do not forget to set the power in the 5-volt settings when this connection is made, if the USBDM device supports power management programmatically. Or put the jumper on USBDM in the appropriate position.