Maintain Original Scale of Items When Placing-Linked in InDesign

Hello all, 

I am using InDesign in order to create architectural presentations. Often times that requires placing architectural drawings, which should be kept tin their original scale (ie, appear in the document so that if an items measured 2 inches in the original drawing, it should measure the exact 2 inches after being placed in indesign).

When placing by double-clicking, usually the placed item will maintain its original scale. However, if the item is placed in a previously created frame to fit a certain desired layout, it would not maintain the original scale; I can't figure out how InDesign "decides" what scale to import it in. When this happens, I try to scale the drawing back to its original dimensions, but this is difficult to achieve and often its very hard to get the exact original scale. 

My question is:

Is there a way to automatically place items in their original scale, in an existing placeholder?   

Thanks a bunch everyone!