Interra ITR901-0002 User manual

©2022 INTERRA Version 1.2
KNX LINE COUPLER
Product Manual

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CONTENTS
1. Product Description.....................................................................................................................5
1.1. Front Panel........................................................................................................................................... 6
1.2. LED Indication...................................................................................................................................... 7
1.3. Device Commissioning....................................................................................................................... 8
1.4. General Features................................................................................................................................. 8
2. Operational Description ...........................................................................................................9
2.1. TP Coupler Application....................................................................................................................... 9
2.2. TP Repeater Application................................................................................................................... 10
2.3. KNX Network Installation.................................................................................................................. 11
2.3.1. Physical Address Topology ...................................................................................................... 11
2.3.2. KNX Topology ............................................................................................................................ 12
2.4. Programming...................................................................................................................................... 13
2.4.1. Programming Button.................................................................................................................. 13
2.4.2. Physical Address Assignment.................................................................................................. 13
2.5. Special Functions.............................................................................................................................. 14
2.5.1. Manual Function......................................................................................................................... 14
2.5.2. Restore Factory Settings........................................................................................................... 14
2.5.3. LED Status Display .................................................................................................................... 14
3. ETS Database Parameters Coupler Operation .....................................................................15
3.1. General ............................................................................................................................................... 15
3.2. Main Line ............................................................................................................................................ 16
3.3. Subline ................................................................................................................................................ 18
4. ETS Database Parameters Repeater Operation ...................................................................20
4.1. General ............................................................................................................................................... 20
4.2. Main Line ............................................................................................................................................ 21
4.3. Subline ................................................................................................................................................ 22
5. Technical Drawings ................................................................................................................23

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1. Product Description
The KNX TP Media Coupler ITR901-0002 works as a KNX line/area coupler to provide a bi-directional data connection
between two KNX TP lines/areas. KNX TP main line and KNX TP subline are coupled having a galvanic isolation in between.
Using the TP Coupler application, ITR901-0002 can be used as a KNX TP line coupler to connect several KNX TP lines but
also as a KNX TP area coupler to connect several TP areas or different KNX TP installation systems via a TP Backbone.
Telegram filtering is accomplished according to the installation place in the hierarchy (Physically addressed Telegrams) and
according to the built in filter tables for group communication (Group oriented Telegrams). For detailed diagnosis all
operational modes/states are shown by a duo-LED display.
Using the TP Repeater application, ITR901-0002 is able to extend a KNX TP line providing unfiltered data transfer and
galvanic isolation between segments. Up to four line segments can form a single KNX TP line by connecting three ITR901-
0002 line repeaters. Each line segment requires its own KNX power supply unit.
To ease commissioning and troubleshooting the Manual Function for short-time telegram filter switch-off
and special routing/repetition/confirmation settings are available.
Note: In this document, physically addressed telegrams are named Physical Telegrams, also group oriented telegrams are
named Group Telegrams.

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1.1. Front Panel
Fig 1 : Front View
The following table shows information and descriptions of the front panel.
LED
BUTTONS / CONNECTORS
1. Bus State KNX TP (Main Line)
A. Function Button
2. Bus State KNX TP (Subline)
B. Program Button
3. Telegram Traffic KNX TP (Main Line)
C. KNX TP Main Line Connector
4. Telegram Traffic KNX TP (Subline)
D. KNX TP Subline Connector
5. Group Addres(GA) Routing (0....13)
6. Physical Address(PA) Routing
7. Programming
Table 1 : LED & Buttons Descriptions
2
4
6
A
B
D
1
3
5
7
C

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1.2. LED Indication
If ITR901-0002 is used as Line Couper without physical address x.y.0, LED 6 (PA) that is showed at table 1, works not like
described here.
NUMBER
LED
COLOUR
DESCRIPTION
1
Bus State KNX TP
(Main Line)
Green
Main Line OK.
Red
Manual Function Active.
2
Bus State KNX TP
(Subline)
Green
Subline OK.
Off
Subline not connected.
3
Telegram Traffic KNX
TP
(Main Line)
Blinking Green
Telegram traffic extent indicated by blinking.
Blinking Red
Transmission error.
Off
No telegram traffic.
4
Telegram Traffic KNX
TP
(Subline)
Blinking Green
Telegram traffic extent indicated by blinking.
Blinking Red
Transmission error.
Off
No telegram traffic.
5
Group Address Routing
Green
Filter table active.
Orange
Route all.
Red
Block all.
Off
Routing of Group Telegrams is different on main
line and subline.
6
Physical Address
Routing
Green
Filtering active.
Orange
Route all.
Red
Block all.
Off
Routing of Physical telegrams is different on main
line and subline.
7
Programming
Red
Program Mode active.
Off
Program Mode not active.

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1.3. Device Commissioning
The default settings of the device are :
➢All telegrams are blocked due to the filter table is not defined.
➢The Manual Function switch-off time is 120 min.
➢Physical address is “15.15.0”.
➢Never connect the device to 230V.
Fig 2 : Connection Scheme
1.4. General Features
➢ITR901-0002 KNX IP Router supports extended frames and long telegrams up to 240 bytes APDU length.
➢ACK sending on sent out messages is ETS configurable.
➢When there is no IACK response on the subline the Interra KNX IP Router is able to repeat messages up to three
times. Repetitions can be configured for both Physical Telegrams and Group Telegrams via ETS (to ease
troubleshooting). After an IACK response no repetition is following and the negative IACK/BUSY failure mechanism
is maintained.
➢Automatic function for switching back to run-time telegram filtering after configurable suspension period. This
avoids forgetting the reactivation of filtering.
➢For an ETS configurable time period, it is possible to switch off telegram filtering by only pressing a button on the
device front panel. Without additional ETS download filtering is suspended. This is necessary for running fast
diagnostics on site.

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➢Temporarily suspending telegram filtering eases commissioning and debugging. Without ETS download temporary
access to other lines becomes possible.
➢In networks with high busload the internal amount of communication buffers are capable of smoothing peeks in the
communication load course.
➢ITR901-0002’s ETS database entries are available for ETS4 and later.
2. Operational Description
In network installations ITR901-0002 can be used as KNX TP area/line coupler or KNX TP line repeater. With its default
settings, device operates as is supposed to.
2.1. TP Coupler Application
When ITR901-0002 receives telegrams (for example during commissioning) that use Physical Addresses as destination
addresses, it compares the Physical Addresses of the receiver with its own physical address and decides on that whether it
has to route the telegrams or not.
When ITR901-0002 receives telegrams that use group addresses as destination addresses, it reacts in accordance with the
parameter settings. During normal operation (with default settings), ITR901-0002 only routes telegrams whose group
addresses are entered in the filter table. If ITR901-0002 routes a telegram and does not receive an acknowledgement, or if
a bus device discovers a transmission error, the coupler repeats telegrams up to three times (depending on the
corresponding parameter that is set by ETS). With the parameters "Repetitions if errors...“, this function can be configured
separately for each line. It is recommended to use the default parameter setting.
If not already configured as “Line Coupler”, the ETS application program “TP Coupler” has to be downloaded to the device.
Under the Information tab the configuration setting can be changed by the drop-down menu “Change Application Program”.
After changing the configuration setting the filter table entries can be added manually. Updating the application program
version can also be done here.
Fig 3 : TP Coupler Application Program

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2.2. TP Repeater Application
Any received telegram is routed to all lines irrespective of in which line it is processed. Line repeaters make no use of a filter
table. It is therefore not important whether the telegram is generated within a line or whether it is sent from an upper line to
a lower line via a coupler.
When a transmission error occurs, i.e. due to a wrong receiving Physical Address, the line repeater is able to repeat the
telegram up to three times. With the parameter "Physical: Repetition if errors …“ this function can be configured separately
for each line.
In case of routing a Group Telegram without receiving an acknowledgement, the line repeater repeats telegrams up to three
times. With the parameter "Group: Repetitions if errors...“, this function can be configured separately for each line.
If not already configured as Line/Area/BB Repeater, the ETS application program “TP repeater” has to be downloaded to
the device. Under the Information tab the configuration setting can be changed by the drop-down menu “Change Application
Program”. After changing the configuration setting the filter table entries can be added manually. Updating the application
program can also be done here.
Fig 4 : TP Repeater Application Program

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2.3. KNX Network Installation
2.3.1. Physical Address Topology
For line coupler functionality in a KNX network ITR901-0002 has to use the correct Physical Address of a line coupler (X.Y.0,
1≤X & Y ≤15). In ETS up to 225 addresses can be defined (from 1.1.0 to 15.15.0).For area coupler functionality in a KNX
network ITR901-0002 has to use the correct Physical Address of an area coupler (X.0.0, 1≤X≤15). In ETS up to 15 areas
can be defined. If ITR901-0002 is used in a KNX system for both purposes, it is only necessary to ensure that the ITR901-
0002 used as a line coupler has a line coupler address assigned from a free addressing area. Following figure illustrates the
ITR901-0002 router topology for KNX lines and KNX areas.
Ex : If an area coupler with address 1.0.0 already exists on the backbone no line coupler with address 1.X.0, 1≤X≤15 can
be added here. Even if no line coupler with address 1.1.0 exists on the subline of the 1.0.0 area coupler. Vice versa, if a line
coupler with address 1.1.0 already exists in the installation no area coupler with address 1.0.0 can be added.
Fig 5 : Interra KNX TP Network Topology
1.0.0
1.X.0
2.0.0
3.1.0
TP
Backbone
TP
Area
TP Line
Main Line
Subline
Subline
TP
Area

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2.3.2. KNX Topology
Via a line/area coupler up to 15 lines can be connected to a main line called an area. It is possible to have up to 64 bus
devices on one line. With use of line repeaters, a line can theoretically be extended to 255 bus devices. This means up to
four-line segments can form a single KNX TP line. But it is common practice on exceeding 64 bus devices to insert a new
line instead of extending the originating one.
Note: Each line segment requires its own KNX power supply unit.
Note: Using repeaters on the backbone or on the main line is not allowed.
Fig 6 : Network Topology
The free tree structure of the KNX topology prevents problems caused by circling telegrams and heavy bus load. So,
interconnection between lines is strictly forbidden.

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2.4. Programming
As mentioned before, it is possible to program the device with ETS. There are several things to be known in order to activate
the device. These are described in the headings below.
2.4.1. Programming Button
To download the desired physical address or an ETS setting the Program Button must be pressed first. Successive pressing
the Program Button will turn on and off the Program Mode. According to table 1, LED 7 lighting in red colour indicates
Program Mode is active. When Program Mode is active ETS recognizes the device of interest for downloading.
2.4.2. Physical Address Assignment
To commission the device an interface connection (IP, USB) to the KNX bus system is required. The device is supplied with
the individual physical address 15.15.0. The KNX product database entry (available for ETS4 and higher) can be
downloaded from the Interra website and from the KNX Online Catalog. With the ETS the physical address can be assigned
to the device by setting the desired address in the properties window of the ETS. After starting the ETS download and then
pressing the Program Button the device restarts itself.
Fig 7 : ETS Properties Window
Note: In this document only the term “physical address” is used. The term “physical address” means the KNX physical
address as well as the ETS individual address. Both terms are used by the KNX organisation interchangeably.

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2.5. Special Functions
The Function Button activates the device’s special functions. Manual function and Factory Reset can be activated. It
depends on time/number/state the Function Button is being pressed.
2.5.1. Manual Function
During normal operation a rather short press (≈ 3 sec) activates the Manual Function. When the Manual Function is active,
either all Physical Telegrams or all Group Telegrams or both pass the ITR901-0002 without filtering. After the Switch-off time
period has elapsed ITR901-0002 automatically switches back to normal operation. To configure the Manual Function and
set the Switch-off time use the General parameter tab like shown in chapters 3.1 and 4.1. After switching back from Manual
Function to normal operation the latest downloaded parameter setting / filter table entries are active again.
2.5.2. Restore Factory Settings
A very long press (≈ 15 sec) of the Function Button soon followed by a second press for some seconds executes the Factory
Reset.
After the first press the LED display lights different with mixed colour. After the second press all parameters will be set to
factory default (includes physical address). Subsequently, LEDs show the normal display again.
2.5.3. LED Status Display
The following table shows the manual function LED states.
NUMBER
LED
COLOUR
DESCRIPTION
1
Bus State KNX TP
(Main Line)
Green
2
Bus State KNX TP
(Subline)
Orange
If connected.
5
Group Address Routing
Orange
6
Physical Address
Routing
Orange
Table 2 : LED Status Display for Manual Function

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The following table shows the LED status for returning to the factory settings after the first press of the button.
NUMBER
LED
COLOUR
DESCRIPTION
1
Bus State KNX TP
(Main Line)
Orange
2
Bus State KNX TP
(Subline)
Orange
Lights red if not connected.
5
Group Address Routing
Orange
6
Physical Address
Routing
Orange
Table 3 : LED Status Display for Factory Reset After First Button Press
3. ETS Database Parameters Coupler Operation
All images related to the device used in this section are taken from ETS5 version.
3.1. General
The following shows the ETS parameters to be seen when entered to General Tab Parameter Page.
Fig 8 : General Tab Parameter Page
PARAMETER
DESCRIPTION
VALUES
Manual Function
Configuration setting for telegram routing when
the Manual Function is active.
disabled
pass all telegrams
pass all Physical address telegrams
pass all Groups address telegrams
Switch-off time for
Manual Function
After expiry of this period the Manual Function is
switched off automatically.
10 mins, 1 hour, 4 hours, 8 hours

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3.2. Main Line
For Group Telegrams and Physical Telegrams, the setting “transmit all” is intended only for testing purposes. Please do not
use for normal operation.
Note: If the parameter “Send confirmation on own telegrams” is set to “yes”, the ITR901-0002 systematically sends an ACK
on any own routed telegram.
Fig 9 : Main Line Tab Parameter Page

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PARAMETER
DESCRIPTION
VALUES
Telegram routing
block : No telegrams are routed.
filter : Telegrams entered in the filter table are
routed.
route : All telegrams are routed.
configure : The following parameters that will be
shown must be set manually.
Group: filter, Physical: block
Group and Physical: filter
Group: route, Physical: filter
Group and Physical: route
configure
Group telegrams : Main
group 0...13*¹
transmit all : Group telegrams (main group
0...13) are all routed.
block : Group telegrams (main group 0...13) are
all blocked.
filter : Group telegrams (main group 0...13) are
routed if entered in the filter table.
transmit all (not recommended)
block
filter
Group telegrams : Main
group 14...31*¹
transmit all : Group telegrams (main group
14...31) are all routed.
block : Group telegrams (main group 14...31) are
all blocked.
filter : Group telegrams (main group 14...31) are
routed if entered in the filter table.
transmit all (not recommended)
block
filter
Physical telegrams
transmit all : All of the Physical Telegrams are
routed.
block : All of the Physical Telegrams are blocked.
filter : Depending on the physical address,
physical telegrams are routed.
transmit all (not recommended)
block
filter
Physical telegrams :
Repetition if errors on
main line
After main line transmission error (e.g. due to
missing receiver) Physical telegrams :
no : Are not repeated.
up to 3 repetitions : Are repeated max. 3 times.
one repetition : Are repeated once.
no
up to 3 repetitions
one repetition
Group telegrams :
Repetition if errors on
main line
After main line transmission error (e.g. due to
missing receiver) Group telegrams :
no : Are not repeated.
up to 3 repetitions : Are repeated max. 3 times.
one repetition : Are repeated once.
no
up to 3 repetitions
one repetition
Telegram confirmation
on main line
if routed : Routed telegrams to the subline are
confirmed by an ACK on the main line.
always : Each telegram on the mainline is
confirmed by an ACK.
if routed
always
Send confirmation on
own telegrams
yes : Telegrams sent out to the mainline are
confirmed by added ACK.
no : No ACK confirmation.
yes
no
*¹This parameter, is only visible when “Telegram routing” parameter is set to “configure”.

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3.3. Subline
For Group Telegrams and Physical Telegrams the setting “transmit all” is intended only for testing purposes. Please do not
use for normal operation.
Fig 10 : Subline Tab Parameter Page

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PARAMETER
DESCRIPTION
VAUES
Telegram routing
block : No telegrams are routed.
filter : Telegrams entered in the filter table are
routed.
route : All telegrams are routed.
configure : The following parameters must be set
manually.
Group: filter, Physical: block
Group and Physical: filter
Group: route, Physical: filter
Group and Physical: route configure
Group telegrams : Main
group 0...13*¹
transmit all : Group telegrams (main group
0...13) are all routed.
block : Group telegrams (main group 0...13) are
all blocked.
filter : Group telegrams (main group 0...13) are
routed if entered in the filter table.
transmit all (not recommended)
block
filter
Group telegrams : Main
group 14...31*¹
transmit all : Group telegrams(main group
14...31) are all routed.
block : Group telegrams (main group 14...31) are
all blocked.
filter : Group telegrams (main group 14...31) are
routed if entered in the filter table.
transmit all (not recommended)
block
filter
Physical telegrams
transmit all : Physical telegrams are all routed.
block : Physical telegrams are all blocked.
filter : Depending on the physical address,
physical telegrams are routed.
transmit all (not recommended)
block
filter
Physical telegrams :
Repetition if errors on
subline
After subline transmission error (e.g. due to
missing receiver) Physical telegrams :
no : Are not repeated.
up to 3 repetitions : Are repeated max. 3 times.
one repetition : Are repeated once.
no
up to 3 repetitions
one repetition
Group telegrams :
Repetition if errors on
subline
After subline transmission error (e.g. due to
missing receiver) Group telegrams :
no : Are not repeated.
up to 3 repetitions : Are repeated max. 3 times.
one repetition : Are repeated once.
no
up to 3 repetitions
one repetition
Telegram confirmation
on subline
if routed : Routed telegrams to main line are
confirmed by an ACK on the subline.
always : Each telegram on the subline is
confirmed by an ACK.
if routed
always
Send confirmation on
own telegrams
yes : Telegrams sent out to the subline are
confirmed by added ACK.
no : No ACK confirmation.
yes
no
Configuration from
subline
If blocked an ETS download to the device can
occur only via main line.
enable
disable
*¹This parameter, is only visible when the “Telegram routing” parameter is set to “configure”.

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4. ETS Database Parameters Repeater Operation
All images related to the device used in this section are taken from ETS5 version.
4.1. General
The following shows the ETS parameters to be seen when entered to General Tab Parameter Page.
Fig 11 : General Tab Parameter Page
PARAMETER
DESCRIPTION
VALUES
Manual Function
Configuration setting for telegram routing when
the Manual Function is active.
disabled
pass all telegrams
pass all Physical address telegrams
pass all Groups address telegrams
Switch-off time for
Manual Function
After expiry of this time period, the Manual
Function is switched off automatically.
10 mins, 1 hour, 4 hours, 8 hours