The USB-UART on the Kitprog3 van be used with Demokit as follows:
Configure UART:
Baudrate: 115200
Databits: 8
Parity: None
Stopbits: 1
FlowControl: None
Connect:
Devkit Kitprog
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GND GND
RX (P10_0) TX (P12_7)
TX (P10_1) RX (P12_6)