Paneldue with Duet 3 6HC. information request
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You just need to map
+5v -> 5V_EXT
GND -> GND
URXD0 -> IO0_0.out
UTXD0 -> IO0_0.inJust like shown on the wiki https://duet3d.dozuki.com/Wiki/Getting_Started_With_Duet_3#Section_Running_in_standalone_mode