For me, the plot settings and modifications in layout are interesting.
Also, the changing appearance of units in Civil-Menu.
new drawing, units=meter, Civil-Units=meter -> Go to Layout, start Plot dialogue: The scale is set to: "1:1000; 1=1". Changing of the scale keeps the relation "1000", eg: "1:500; 1=0.5"
-dwgunits: select centimeter (4); scale model, don't scale layout
units=centimeter, Civil-Units=centimeter -> Go to Layout, start Plot dialogue: The scale is set to: "1:10; 1=1". Changing of the scale keeps the relation "10" (this reflects the factor 100 from meter to centimeter)
-dwgunits: select milliimeter (3); scale model, don't scale layout
units=millimeter, Civil-Units=millimeter -> Go to Layout, start Plot dialogue: The scale is set to: "1:1; 1=1". Changing of the scale keeps the relation "1"
I would like to know which value (variable) is used by the plot dialogue to find the settings "1:1000 / 1:100 / 1:1"