The orientation of the Dimension text is depending on the VIEW rotation the moment you place the dimension. So if your view is rotated upside down the dimension is oriented that way.
To change the orientation you first rotate the a view the way you like and then change the dimensions to be oriented according to this view.
See also: http://communities.bentley.com/Communities/Other_Communities/AskInga/w/AskInga/those-flipping-dimensions_2100_.aspx
In DWG you only can define a ACS (Utilities>Auxiliary Coordinates) This is available when you come back into the drawing you can call it from that list. Wjhen you Save As ... DGN you can File>Save Settings and it will remember the active ACS when you come back.
Be aware that the ACS is a differnt coordinate system as the design origin. (keyins: ACTIVE ORIGIN or GO=) This is the coordinate system that is oriented towards the "design cube" - that is the whole space you can use to draw in. You can move it but not rotate it against the design cube. You can define several ACS in comparison that can be moved and rotated wherever you like Check the help for more about the active origin.
Need help for the selected function? Click into the "Toolsettings" dialog and press F1 For Screenshots try Win+Shift+S on your Keyboard - Using "ScreenRecorder" for Videos Brauchst Du Hilfe zur gewählen Funktion? Klicke in das "Funktionseinstellungsfenster" und drücke F1
Thanks for the reply Gerd. The 'change dimension view' keyin worked fine.
With regard to rotating the ACS in a DWG file, in Autocad there is a method to rotate the world ACS to align with an element or view.It allows you to set the ACS to a view and it stays like that. Is there an equivalent in Microstation?:
I've tried all the ACS commands in Microstation, but they are not permanent.
Yes that sounds the same as in MicroStation. But while the ACS is stored. The Active ACS is not kept with the DWG.
The same commands in a DGN are filed though in MicroStation. Yet not in a DWG .
If that is the case otherwise working in acad I think you need to check for this through a Service Ticket.
I do not have have acad to check against.
Thanks again Gerd,
I will lodge a change request.