Interra ITR901-0002 User manual

©2022 INTERRA Version 1.2
KNX LINE COUPLER
Product Manual

KNX Line Coupler
Product Manual
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@2022 INTERRA PM220621013CEN
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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