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Siemens
Installation guide RXB, RXL
CM110381en_01
Building Technologies
Konnex bus technology
28 Feb 2009
4
Konnex bus technology
A detailed depiction is available in the Konnex manual (
4.1
Cable specification
4.1.1
Bus cable (RXB and RXL)
RXB and RXL controller communication is based on Konnex communications on
TP1 (TP = Twisted Pair).
The simplest form of the "Konnex TP1" bus comprises a two-core bus cable with
stranded lines CE+ (red) and CE- (black).
31
27
Z
05
CE
+
CE
−
The following cables may be used depending on supply in a country:
YCYM 2x2x0.8
Fixed installation.
Dry, humid, wet rooms.
Outdoors (not exposed to sunlight).
Surface mounted, flush mounted, in pipes.
J-Y(St)Y 2x2x0.8
Fixed installation.
Indoors only.
Surface mounted, in pipes.
JH(St)H2x2x0.8
Halogen-free wire.
Laid at distance.
A-2Y(L)2Y
or
A-2YF(L)2Y
Remote
cable.
Outdoor cabling.
4.1.2
Bus cable technical data:
Bus cable requirement
IEC 189-2 (or equivalent)
Cable type
two-core, stranded (red/black)
or
2x two-core, stranded (red/black
white/yellow)
or
spiral quad
Strands
min. 5 / m
Diameter
min. 0.8 mm, max. 1.0 mm
Wave resistance (ideal value)
120
Ω
at 100 kHz
Line resistance
20
Ω
/km to max. 75
Ω
/km
(Larger value requires a proportional
shortening of permissible cable lengths).
Cable screen
not required
(devices
without
screened
connection)
Bus terminating resistor
Not required