About the Subnetwork Bus
Controllers use the subnetwork bus to communicate with room
devices (see the controller’s datasheet for compatibility), including
Q.RCU-D-xx sensors, using standard structural (Cat 5e) cabling
by connecting them in a daisy-chained fashion to the controller’s
Subnet Port
. See
Table 2 : Number of room devices supported by
controller model, and allowed adressing range
.
The maximum length of the room device subnetwork bus is 120 m.
Communicating Sensors Sub-Network Bus
– Cat 5 Cable with RJ-45 Connectors
Q.RC-D1xxx Controller
Communicating Sensors
Sub-Network Bus:
120 m Maximum
Figure 7:
Subnetwork Bus Overview
For Q.RC-D1xxx Series controllers, the maximum length
between two consecutive devices on the sub-network
bus is 30 m.
Connection Cable
Connect SBC communicating sensors to the controller’s
Subnet
Port
with a standard Cat 5e Ethernet patch cable fitted with
RJ-45 connectors.
If you make your own patch cable, use Cat 5e cable and
crimp the RJ-45 connectors at both ends of the cable
either as T568A or T568B.
Table 2 : T568A and T568B Terminations for an RJ-45 Connector
Pin
T568A (at both cable ends)
T568B (at both cable ends)
Pa
ir
Co
lor
Pa
ir
Co
lor
1
3
white/green stripe
2
white/orange stripe
2
3
green solid
2
orange solid
3
2
white/orange stripe
3
white/green stripe
4
1
blue solid
1
blue solid
5
1
white/blue stripe
1
white/blue stripe
6
2
orange solid
3
green solid
7
4
white/brown stripe
4
white/brown stripe
8
4
brown solid
4
brown solid
The final result of a crimped RJ-45 connector is shown graphically below.
T568A
T568B
1 2 3 4 5 6 7 8
1 2 3 4 5 6 7 8
Stripe Solid
Pair 3 Pair 1 Pair 2 Pair 4
Pair 2 Pair 1 Pair 3 Pair 4
Key:
Figure 8:
T568A and T568B Crimp Wire Sequence for an RJ-
45 Connector
Figure 9:
Pins on RJ-45 Jack Face
Patch cables fitted with connectors supplied by SBC are wired
as T568B.
5
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www.sbc-support.com
Installation Guide | 26-604_ENG01 02-2016
Saia-Burgess Controls AG
Q.RCU-D-xx Series
