User Manual

3 / 6
Siemens Communication System Synco living CE1N2708en
Building Technologies 19.01.2009
KNX TP1: Wire-bound communication (Twisted Pair, EIB-compatible)
• For integrating other EIB / Konnex devices in the central apartment unit
• For commissioning / remote operation of the central apartment unit
• For wire-bound communication between zones / apartments and central systems or
equipment, such as
- primary heat generation (Synco 700)
- telephone gateway (OZW775) for plant supervision and remote operation
For detailed information about KNX TP1, refer to Data Sheet CE1N3127en.
KNX RF: Radio communication 868 MHz
KNX RF covers heating control, light and blind control, security (smoke detectors,
window contacts), etc., within a zone / apartment with no need for bothersome cabling.
The frequency band used (868 MHz) ensures a high level of reliability.
Engineering notes KNX RF
To ensure optimum radio coverage, the following points should be observed:
• The distance to devices with electromagnetic emissions, such as wireless
telephones, TV sets, PCs, microwave appliances, etc., should be at least 1 m
• Larger items made of steel or construction elements with metal meshes (e.g. special
glass or concrete), or metal foils in thermal insulation materials, mirrors or metal-
coated heat absorbing glass, can have an impact on the range
• The typical range between transmitter and receiver in residential buildings is 30 m, or
across 2 floors, or 2 concrete ceilings. But depending on the type of house or
building and the materials used, the effective range can be considerably greater or
smaller. If greater distances are to be covered, RF repeaters should be used
RF repeaters are used where transmitter and receiver are too far apart or where the
radio signal is dampened by construction elements or equipment inside the house.
The RF repeater receives radio telegrams from devices in its own system via the
QAX910 central apartment unit and passes them on. The repeaters will be configured
such that the telegrams they repeat are only telegrams received from devices with
crucial ranges.
• If the radio path exceeds 30 m or stretches across more than 2 concrete ceilings or
floors, an RF repeater should be used
• If unexpected problems in terms of range occur, an RF repeater can be easily fitted
at a later stage
• Per system, up to 3 RF repeaters can be operated in parallel
. Rerepetition across
several repeaters (cascading) is not possible (also refer to the “Repeater example“
on the next page)
• If possible, the RF repeater should be located between transmitter and receiver of a
crucial radio path
Mounting location
Radio repeaters
Location of
RF repeaters