What can be programmed in a VDS switcher ref. 2450 and what is it for?

What can be programmed in a VDS switcher ref. 2450 and what is it for?

In two entrance video entry installations you need to use a VDS switcher ref.  2450. It is not necessary in systems in which one of the accesses is audio only.

Its purpose is to select the video signal of the panel from which the call has been made. This selection is via a signal (negative) sent from this panel through an ā€œSā€ wire.

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