Currently there is no means of transmitting telegrams wirelessly

It is not possible to connect Smart home virtual assistants such as Alexa from Amazon or Google Home to a KNX installation.

KNX offers customers increased convenience

One of the objectives of the KNX Association is the certification of training centres

KNX devices allowing configuration via more than 1 mechanism (e.g. S-mode as well as E-mode) do not exist.

One of the objectives of the KNX Association is the definition of testing and quality standards together with the KNX member companies

KNX offers customers the possibility of adaptation of installations to changing requirements

All KNX products are tested by KNX test engineers at the headquarters of KNX Association.

Since the introduction of the KNX standard, KNX products may no longer be branded with the EIB logo.

KNX can be used for high-speed transmission of audio and video data

One of the benefits of certified KNX training is the standardized minimum course content

A building owner wishing to include KNX in a new building can consult the KNX partner database on the KNX Association web site to check for qualified installation companies with certified staff in his vicinity

If an application program of a sensor is downloaded into an actuator, the bus coupling unit reprograms the application module accordingly

The programming button on a KNX product or the BCU has to be pressed to check the correct individual address of a KNX device during error diagnostics.

The programming button on a KNX product or the BCU has to be pressed to program every change in the application program.

The version of the system software included in a bus device is identified by its “mask version" or "device descriptor type 0".

An application program of manufacturer A can not be downloaded into a product of manufacturer B. ETS compares the manufacturer codes of both: if different, download is not possible.

The connection between a KNX TP bus device and the bus is in most cases ensured via a bus connector.

2 cores of the KNX TP bus cable are required for the transmission of telegrams and 2 other cores are required for supplying the same device with power

If the polarity of the connected cable at a certain bus device is incorrect, the wrongly polarised bus device does not function until the fault is rectified

2 cores of the KNX TP bus cable are required for the transmission of telegrams and in most cases, to supply the bus devices with power

A possible function of a KNX sensor is to detect physical variables such as temperature, voltage, current,...

Bus devices can be divided into 3 classes: sensors, actuators and controllers

A System 2 application program can be downloaded into a System 1 device.

A function of a KNX actuator is to connect different KNX lines

A power supply and choke is required to enable sensors and actuators to function in a KNX TP installation

The various data point types (DPT) were standardized so manufacturers could limit interoperability with other manufacturers

The sending group address is the first assigned group address of a group object

The DPT "Scaling" allows the setting of the brightness of a dimming actuator directly

It is possible to mount 256 bus devices in a KNX TP line under all circumstances.

The individual address is structured in the following way: Line.Bus device.Area

A group object has the group addresses 1/5/8, 0/0/1, 2/3/4 and 6/7/8. A read request may be sent to any of these group addresses in order to receive a reply

A maximum of 256 bus devices can operate in a KNX TP line. The number can be lower, depending on the type of power supply unit used and the power consumption of the connected bus devices.

The group address of the receiver is transmitted in a switching telegram

A status or feedback object indicates whether the system software of the bus coupling unit can be overwritten

By means of the Step/Stop group object, a moving blind will be stopped or if the blind is not in motion, the slats position will be adjusted

After a read request, a group object will send one single response to the group address marked as "sending"

The value of the group object is transmitted in a switching telegram

In order to ensure that unsheathed bus wires do not come into contact with 230 V cables, either two separate installations/wall junction boxes shall be used or boxes with a partition, guaranteeing the required clearance/creepage distances

The protective earth connection to the TP power supply unit has no function. It only serves to optionally branch off the earth conductor

The standardized bus connector allows up to 5 branch connections

When the maximum distance per line segment of 1000 m is exceeded, proper signalling can only be ensured when using a terminating resistor

If two TP line segments are to be supplied by a single power supply unit, both line segments must have their own choke

The standardized bus connector connects a KNX TP device with the bus. In order to avoid confusion, this connector shall however not be used for branching off cables.

A lightning current arrester is required as primary lightning protection of a TP line segment if a bus cable between buildings is insufficiently protected against a direct lightning impact (e.g. by means of an earthed steel cable duct)

TP push buttons and 230 V sockets can be installed under a common cover, provided that the socket is protected from further contact if the common cover is removed and only if the manufacturer explicitly states that this combination is permitted

If available, it is required to connect the second twisted pair through, as otherwise the KNX TP installation will not work

The installation of bus and mains cables directly next to one another avoids loops and decreases the risk of damage as a consequence of indirect impact of lightning

The TP sheathed cable may be laid directly next to the 230 V non-sheathed cable

When finalizing the installation, the compliance in terms of the permitted cable lengths has to be checked.

Cable connections need to have been checked by the end of a TP installation to ensure that there are no non-permissible connections

The maximum number of bus devices in a TP line segment depends on the distances between the power supply units in the segment

A maximum of 256 sensors, actuators, line and backbone couplers can be connected to a TP main line

The smallest unit in the TP topology is a line segment

TP areas are connected by the main line of the first area

If a TP line contains line repeaters, only the first line segment needs a mounted power supply unit. The other line segments are powered by the line repeater

A line coupler has the following individual address: x.x.0 (where x is a value between 1 and 15).

The filter table of a line coupler contains a list of all the individual addresses of the devices connected to that line

With the help of filter tables, line and backbone couplers ensure that telegram data is only transmitted to these parts of the installation where this information is really needed

The routing counter has the value 6 at the start of a normal group communication

The line couplers shall be programmed via the primary line

The TP bus cable can be laid randomly using terminating resistors

Because KNX is an open protocol, a KNX installation can be directly connected to many other non-KNX systems without a gateway

A TP main line within an area may contain any number of power supply units

By changing the individual address in the 'Settings' tab of the properties window, ETS will automatically download this modified address to the corresponding device

If the diagnostic tool 'Device Info' is active, it is possible to simultaneously trace telegrams and program devices using the same interface

The priorities 'Low', 'High', 'Alarm' and 'System' can be assigned to a group object in ETS

A standard KNX device that is fully programmed contains an individual address, filter table and IP address

When resetting ('Restart' service) a bus device by means of ETS, the individual address will be reset to 15.15.255

The individual address of an unloaded bus coupling unit is 0.0.0

ETS Professional can be downloaded free of charge. The software can be installed but the complete functionality needs to be released by means of a dongle or via a Cloud license, which can be purchased from the KNX Association in Brussels.

When downloading an individual address locally into a device (for example, a USB interface), there is no need to activate the programming mode

All product data in a certain older ETS format can be imported in an ETS version supporting a newer product data format.

ETS allows the export of the group addresses from the project database for use in visualization packages using an OPC server

All files in the 'Attachments' tab are exported during project export.

One generation of ETS will typically allow to export the product data in the format of the former ETS generation.

It is possible to limit the number of devices shown in the Catalogs window by entering filter criteria in the 'Search' field

A group object uses the group addresses 5/3/88, 0/0/27, 4/3/2. The sending group address can only be modified from 5/3/88 to 4/3/2 by deleting the device and then reinserting it

When a parameter is modified, ETS warns that group associations will be invalidated. This means that the individual address of the device must be entered again

Partial download is not possible

After a bus device has been unloaded, it cannot be programmed anymore with the previously programmed application

The driver for the USB interface has to be re-installed before each programming session

After a bus device has been unloaded, the bus device has to be sent back to the manufacturer

The programming of a KNX TP installation can be changed later on at any time by downloading the application

After a bus device has been unloaded, it can be programmed again as normal

Programming a KNX TP installation can be done without power

Partial download is useful when only parameters/ group addresses have to be downloaded

Partial download is possible via the USB interface

Partial download should not be done because of the high bus load

Programming a KNX TP installation can be done in advance, e.g. in a workshop by connecting a single bus device to a small installation consisting of a power supply and a choke

Partial download is only possible via the USB interface

The driver for the USB interface will be automatically installed when connecting it to the commissioning PC

After a bus device has been unloaded, the bus device is automatically deleted from the ETS building view

The driver for the USB interface has to be installed via a separate installation program on the commissioning PC

The modulation used in KNX RF is Amplitude Shift Keying

A multi-channel KNX RF device has the possibility to send information over alternative channels, should one of the fast or slow channels be blocked.

It is possible to downgrade a KNX Multi RF-device to a KNX Ready RF device

RF signals pass through walls and other obstructions, which do not influence the reception capabilities of KNX RF receivers

KNX RF Multi slow channels can e.g. be used for applications such as lighting