Wiring - Rehau NEA SMART 2.0 Service Manual

5.5

Wiring

Basics
The NEA SMART 2.0 communication architecture consists of two
separate BUS systems.
The Zone Bus (ZOBUS) connects the NEA SMART 2.0 Base, the NEA
SMART 2.0 R-Module and the wired room units. The following needs
to be considered:
- 2-wire
- Polarity reversal protected
- Using any topology
- No special requirements for line type
Fig. 5-1 Zone Bus and System Bus
Connection between
Unit 1 Unit 2
Base Room unit Bus
Room unit Bus Room unit Bus
Base R-Module
Base Base
Base U-Module
Tab. 5-9 Recommended cable types
Maximum length is 100 m in case I (Y) St Y 2 x 2 x 0,8 mm is used.
Maximum length may differ if other cable types are used.
The System Bus (SYSBUS) connects the NEA SMART 2.0 Bases and the
NEA SMART 2.0 U-Modules. The following rules must be considered:
- Must be installed in series
- Requires shielded twisted pair line.
- Maximum length is 500 m in case I (Y) St Y 2 x 2 x 0,8 mm is used.
Maximum length may differ if other cable types are used.
The use of existing wires is possible, but certain rules need to be
followed.
Communication system Cable type recommended / alternative
I (Y) St Y 2 x 2 x 0,8 mm / existing 2-wire line
ZOBUS
Zone Bus
I (Y) St Y 2 x 2 x 0,8 mm / existing 2-wire line
ZOBUS
Zone Bus
I (Y) St Y 2 x 2 x 0,8 mm / existing 2-wire line
ZOBUS
Zone Bus
I (Y) St Y 2 x 2 x 0,8 mm
SYSBUS
System Bus
I (Y) St Y 2 x 2 x 0,8 mm
SYSBUS
System Bus
Topology / maxi-
mum lenght
Any / 100 m
Any / 100 m
Any / 100 m
Line / 500 m
Line / 500 m
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