Mamiya RZ67 ProII /AE Prism FE701/Iso with digital back

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Hello, I am posting here as I do not fiind any forum section related to the RZ67 cameras.

I am using a RZ67 ProII (not the D model ) with a Leaf Aptus . The interface adapter plate does not have any digital connection, so that no info is passed between the back and the camera, as it is the case with the RZ67 ProIID / HA701 plate Can I use a AE Prism FE701, and what iso does the prism defaults to if it does not receive the info from the back ?

Best Pierre