Lenz Digital Plus XpressNet Phone Adapter Betriebsanleitung Seite 28

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The XpressNet address
For a fault-free exchange of information with the command station, each input device
connected to XpressNet (XBUS) must have its own device address. Ex-works the
XPA is set to the address 01. If you are already operating another XpressNet device
with this address, you will have to give a different, unused address to your XPA. You
will find information on the setting of the XpressNet address in the section "Device
settings".