Data Sheet for Product

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Building Technologies Data sheet KNX bus CE1N3127en
HVAC Products 18.02.2008
In Synco devices, the bus lines are connected to terminals CE+ (red) and CE– (black).
Observe the polarity of the bus lines CE+ and CE– and do not
interchange them.
In Synco devices with spring cage terminals, only one
wire can be inserted per spring
cage terminal. For this reason, terminals CE+ and CE– are available in double and
connected inside the device.
Identify the terminal polarity in third-party devices, e.g. CE+ at bus terminal 1, and CE–
at bus terminal 2.
KNX networks do not
require bus terminating resistors.
The bus devices can be integrated anywhere in the KNX network by observing both the
distance between bus devices and maximum network size.
The following distances and line lengths are designed for KNX-specified bus cables.
See Example 1 and Example 2 on the next page.
In a KNX network with "decentral bus power supply DPSU", the distances depending
on the number of devices featuring DPSU.
Maximum distance
Number of devices
with DPSU
Device with DPSU
to bus device
)
Bus device
to bus device
Total length of all
lines on one line
1 350 m 350 m max. 350 m
2 350 m 700 m max. 700 m
3 to 8 350 m 700 m max. 1000 m
There is no minimum distance between devices with DPSU.
1)
Bus device without power supply
Observer the following distances for a KNX network with "central bus power supply
PSU":
• Distance between two power supply units PSU min. 200 m
• Distance bus device to next neighboring PSU max. 350 m
• Distance between bus devices max. 700 m
• Total length of all lines on one line max.1000 m
At least one PSU is required for each line, and max. two PSUs are allowed per line.
Install the bus supply as close to the network center as possible to achieve maximum
network size.
The distance between the bus device and the next neighboring PSU may not exceed
350 meters. Therefore:
• Depending on the line size, two PSUs may need to be used or a network featuring
several lines and PSUs may need to be established even if the bus device power
consumption does not require it.
Bus connection
Notes
Terminating resistor
Distances and line
lengths
Network with DPSU
Network with PSU
Notes