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Niko Access Control - Digital - How do I connect the 2-wire external video unit to the 2-wire internal video unit?

The 2-wire external video unit is connected to the 2-wire internal video unit via the access control module (510-21400). The access control module provides not only power to both the 2-wire external video unit and the 2-wire internal video unit, it transmits the communication data between these two devices as well.