System description
12
Siemens AB
Security Products
03.2014
3.4 Wireless network – important concept
3.4.1 Segment ID
The
Segment ID
consists of
four digits
.
Every SR35i is identified by a unique four-digit number known as the Segment ID.
All wireless units related to this particular controller are configured with its Segment
ID.
As soon as an RF9 or RF30-EM is configured with the same Segment ID as the
SR35i it strives to communicate with that unit.
Note that in some proprietary systems using Zigbee wireless technology the ex-
pression PAN-ID (Private Area Network Identifier) is used for Segment ID. This
wireless technology is known as Zigbee (IEEE 802.15.4).
The Segment ID must not be the same as a PAN ID in another Zigbee system
nearby.
3.4.2 Address
Every unit in a Bewator Entro network must be identified by a unit address. Each
unit address is visible in the Bewator Entro software.
Each SR35i segment controller is shown as Cxx, where xx is its address. Each
RF9 or RF30-EM is shown as Cxx:Wyy (or Cxx:Ry) where xx is the address of its
SR35i and yy is the address of the wireless unit.
3.4.3 Encryption and replay protection
The
Installation key
,
which is found in the SR35i, is the base for encrypting the
wireless communication.
There is also an integrated replay protection that eliminates any attempt to manipu-
late the doors.
3.4.4 Routing
All units connected to a wireless segment always “strive” to reach the highest level
– that is the SR35i. If this fails a RF9 will be used for forwarding the information (to
SR35i).
Up to four RF9 routers can form a communication chain between a SR35i and an
RF30-EM. Thus a message from the segment controller is allowed to “jump” a
maximum of five times before reaching a door unit.
