Data Sheet for Product

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Building Technologies Data sheet KNX bus CE1N3127en
HVAC Products 18.02.2008
Functions
The KNX bus sends data using TP (twisted pair, stranded wire pair) as transmission
medium. The following data is sent via the bus:
• Configuration data and operator entries.
• Fault and acknowledgement messages.
• Process values and history data.
Synco devices intercommunicate via zone addresses (= logical tags) in LTE mode
(LTE = logical tag extended).
Synco and third-party KNX devices intercommunicate via group addresses in S-mode
(S = System mode).
Mechanical design
The basic version of the KNX bus comprises a cable with one stranded wire pair and a
jacket.
The bus lines (= stranded wire pair) are connected via CE+ (red) and CE– (black).
3127Z05
CE
+
CE
−
Choose the bus cable as per country-specific offerings. You must observe the values
indicated in this data sheet under "Technical data".
Recommended bus cables and associated specifications:
(n = 1 or 2)
• YCYM nx2x0.8 Fixed installation
Dry, humid, wet rooms. Surface-mounted, flush
mounted, in pipes. Installation outdoors (do not
expose to sunlight).
• J-Y(St)Y nx2x0.8 Fixed installation
Indoors only. Surface mounted, in pipes.
• J-H(St)H nx2x0.8 Halogen-free conductor, laid separately.
• A-2Y(L)2Y nx2x0.8 Outdoor cabling.
• A-2YF(L)2Y nx2x0.8 Outdoor cabling.
Body cavity filling: Petroleum jelly.
You can use bus cables without
screen in plants with Synco devices. The screens
available for bus cables do not need to be connected.
If interference is expected on the KNX bus, use a cable with
screen. Connect the
screen as per standard installation rules.
Transmission medium
Communication
LTE mode
S-mode
KNX bus cable
Bus lines
Bus cable selection
Bus cable screens