If you are connecting two consoles via MSC then you can use a DMX switch to switch DMX lines. There are several on the market including the DMX DataLynx and the 8 universe switch from City Theatrical (www.citytheatrical.com/la-dmxIris.htm#eight)
You do not want to use a DMX merger as this could cause problems with both desks sending outputs at the same time.
If you are connecting two consoles via MSC then you can use a DMX switch to switch DMX lines. There are several on the market including the DMX DataLynx and the 8 universe switch from City Theatrical (www.citytheatrical.com/la-dmxIris.htm#eight)
You do not want to use a DMX merger as this could cause problems with both desks sending outputs at the same time.