Gewiss CHORUS GW 90708A User manual

KNX field/line coupler
GW 90708A
Technical Manual

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Contents
1Introduction................................................................................................................................................ 3
2Application ................................................................................................................................................. 4
2.1 Line/area coupling.............................................................................................................................. 5
2.2 Repeater............................................................................................................................................. 6
3"General" Menu (Coupler) ......................................................................................................................... 7
3.1 Parameters......................................................................................................................................... 7
4"Main line" menu (Coupler)........................................................................................................................ 8
4.1 Parameters......................................................................................................................................... 8
5"Sub line" Menu (Coupler)....................................................................................................................... 11
5.1 Parameters....................................................................................................................................... 11
6“General” menu (Repeater) ..................................................................................................................... 14
6.1 Parameters....................................................................................................................................... 14
7"Main line" menu (Repeater).................................................................................................................... 15
7.1 Parameters....................................................................................................................................... 15
8"Sub line" menu (Repeater)..................................................................................................................... 17
8.1 Parameters....................................................................................................................................... 17

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1 Introduction
This manual describes the functions of the KNX field/line coupler (GW 90708A) device and how they are
set and configured with the aid of the ETS configuration software.
The GW90708A device has two separate ETS application programmes based on the function to be
performed:
- Coupler KNX Line coupler S 1.0
- Repeater KNX Line repeater S 1.0
This manual describes the parameters relative to both application programmes.

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2 Application
The KNX field line coupler (from DIN rail) is used to connect a main KNX-TP line with a secondary KNX-TP
line, providing galvanic insulation between the two.
The device filters the traffic between the two lines (coupler) or forwards packs from the main line to the
secondary one (repeater). The coupler can be used to connect a line to a main line or a main line to a
backbone line.
The device is equipped with:
1. Main line status LED
off main line error or device not connected to the bus
fixed green main line functioning
fixed green and red manual function active
2. Sub line status LED
off sub line error or line not connected to the bus
fixed green sub line functioning
3. Main line data traffic status LED
off no data traffic on the main line
flashing green data traffic in progress on the main line
flashing red data transmission error on the main line
4. Sub line data traffic status LED
off no data traffic on the sub line
flashing green data traffic in progress on the sub line
flashing red data transmission error on the sub line
5. Status LED for forwarding telegrams with group addresses
off different telegram forwarding rules between main and sub line
fixed green telegram forwarding according to the filter table
fixed green and red transmit all telegrams
fixed red block telegrams
6. Status LED for forwarding telegrams with physical addresses
off different telegram forwarding rules between main and sub line
fixed green telegram forwarding according to the filter table
fixed green and yellow transmit all telegrams
fixed yellow block telegrams

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7. Manual function key
Press the button key for at least 3 seconds to activate the manual function (defined by the ETS
parameter in the menu). The green and red main line status LEDs (1) turn on to indicate activation of the
function.
With the manual function active, press the button key for at least 3 seconds to reset normal operation.
NOTE: Once normal operation is reset, the last configuration downloaded from ETS is reloaded.
The manual function button key can also be used to reset the factory parameters (resetting the factory
parameters and address 15.15.0):
- Press the button key for at least 15 seconds; the main line status LED (1), the sub line status LED
(2) and the status LED for forwarding telegrams with group addresses (5) turn on green and red,
whereas the status LED for forwarding telegrams with physical addresses (6) turns on yellow and
green
- Release the button key and press it again for at least 3 seconds until the LEDs turn off briefly and
then turn on again according to the configuration set for normal device operation. Reset of
parameters and physical address completed
8. LED for programming
9. Button key for programming
10. Connection terminal for the main line
11. Connection terminal for the sub line
2.1 Line/area coupling
Line coupler (LC)
Physical address X.Y.0.
Connection of a main line (ML) with a field line. Logically, the coupler belongs to the field line.
Area coupler (BC)
Physical address X.0.0.
Connection of a main line (ML) with a backbone line (BL). Logically, the coupler belongs to the main line.

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2.2 Repeater
Line repeater (RP)
Physical address X.Y.Z.
Transmission and repetition of telegrams on a line without a filter. Division of a line into max. 4 independent
line segments with max. 3 repeaters connected in parallel for each line. Each line segment requires its own
KNX power supply (PS).

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3 "General" Menu (Coupler)
The General menu contains the parameters used to define the manual function of the local button key.
The basic structure of the menu is as follows:
Fig. 3.1
3.1 Parameters
3.1.1 Fallback time for manual operation
The manual function activated by the device's local button key can be deactivated by pressing the button key
or automatically after the preset time defined via the parameter “Fallback time for manual operation”
elapses. The values that can be set are:
-10 min
-1 hour (default value)
-4 hours
-8 hours
3.1.2 Manual function
This parameter can be used to define the manual function activated by the button key; the manual function
makes it possible to temporarily change the telegram forwarding rules. The parameter may have the
following values:
- disabled
- pass all telegrams (default value)
- pass physical telegrams
- pass group telegrams

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4 "Main line" menu (Coupler)
The Main line menu contains the parameters used to define the rules for forwarding telegrams from the main
line to the sub line.
The basic structure of the menu is as follows:
Fig. 4.1
4.1 Parameters
4.1.1 Configuration
This parameter can be used to select the rule for forwarding telegrams from the main line to the sub line from
a preset list of rules; based on the selection made, the subsequent parameters are configured as a result;
The values that can be set are:
- groups: filter physical: block
- groups, physical: filter (default value)
- groups: route, physical: filter
- groups, physical: route
- configure
by selecting configure, all the other parameters present in the configuration menu will be configurable. If any
of the other values is selected, the parameters can be consulted but their value is preset and cannot be
changed.
4.1.2 Group telegrams
This parameter is used to define the rule for forwarding telegrams whose recipient has a group and main
group address between 0 and 13 (e.g. 0/x/x, 1/x/x … 13/x/x); The values that can be set are:
- transmit all (for testing only)
all telegrams are forwarded
- block
no telegrams are forwarded
- filter (default value)
only the telegrams with an address present in the filter table are forwarded; remember that ETS
automatically generates the filter tables for each coupler

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4.1.3 Main group telegrams 14/15
This parameter is used to define the rule for forwarding telegrams whose recipient has a group and main
group address 14 or 15 (e.g. 14/x/x, 15/x/x); The values that can be set are:
- transmit all (default value)
all telegrams are forwarded
- block
no telegrams are forwarded
4.1.4 Physical telegrams
This parameter is used to define the rule for forwarding telegrams whose recipient has a physical address
(telegrams that are used during point-point communication, for example when programming a device); The
values that can be set are:
- transmit all (for testing only)
all telegrams are forwarded
- block
no telegrams are forwarded
- filter (default value)
only the telegrams with an address present in the filter table are forwarded; remember that ETS
automatically generates the filter tables for each coupler
4.1.5 Physical: Repetition if errors on main line
This parameter is used to enable the repetition of telegrams generated by the coupler if there is a
transmission error on the main line (e.g. due to a receiver failure); in particular, this parameter refers to
telegrams whose recipient has a physical address. The values that can be set are:
- no
no repetition in case of an error
- normal (default value)
in case of an error, the telegram is repeated up to a maximum of 3 attempts
- reduced
in case of an error, the telegram is repeated only once
4.1.6 Group: Repetition if errors on main line
This parameter is used to enable the repetition of telegrams generated by the coupler if there is a
transmission error on the main line (e.g. due to a receiver failure); in particular, this parameter refers to
telegrams whose recipient has a group address. The values that can be set are:
- no
no repetition in case of an error
- normal (default value)
in case of an error, the telegram is repeated up to a maximum of 3 attempts
- reduced
in case of an error, the telegram is repeated only once

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4.1.7 Telegram confirmations on main line
This parameter defines the rule for confirming telegrams (ACK) transmitted on the main line. The values that
can be set are:
- if routed (default value)
the device sends the confirmation telegram for only the telegrams transmitted on the main line that are
forwarded on the sub line
- always
the device sends the confirmation telegram for all telegrams on the main line, regardless if they are
forwarded or not
4.1.8 Send confirmation on own telegrams
This parameter is used to enable the function for automatically sending the confirmation telegram (ACK) for
the telegrams sent by the device on the main line. The values that can be set are:
- no (default value)
when the device sends a telegram on the main line, it does not send the confirmation telegram (ACK) for
that telegram; the telegram will be confirmed possibly by the devices on the main line
- yes
when the device sends a telegram on the main line, it also automatically sends the confirmation telegram
(ACK) for that telegram, which does not need to be confirmed by the devices on the main line

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5 "Sub line" Menu (Coupler)
The Sub line menu contains the parameters used to define the rules for forwarding telegrams from the sub
line to the main line.
The basic structure of the menu is as follows:
Fig. 5.1
5.1 Parameters
5.1.1 Configuration
This parameter can be used to select the rule for forwarding telegrams from the sub line to the main line from
a preset list of rules; based on the selection made, the subsequent parameters are configured as a result;
The values that can be set are:
- groups: filter physical: block
- groups, physical: filter (default value)
- groups: route, physical: filter
- groups, physical: route
- configure
by selecting configure, all the other parameters present in the configuration menu will be configurable. If any
of the other values is selected, the parameters can be consulted but their value is preset and cannot be
changed.

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5.1.2 Group telegrams
This parameter is used to define the rule for forwarding telegrams whose recipient has a group and main
group address between 0 and 13 (e.g. 0/x/x, 1/x/x … 13/x/x); The values that can be set are:
- transmit all (for testing only)
all telegrams are forwarded
- block
no telegrams are forwarded
- filter (default value)
only the telegrams with an address present in the filter table are forwarded; remember that ETS
automatically generates the filter tables for each coupler
5.1.3 Sub group telegrams 14/15
This parameter is used to define the rule for forwarding telegrams whose recipient has a group and main
group address 14 or 15 (e.g. 14/x/x, 15/x/x); The values that can be set are:
- transmit all (default value)
all telegrams are forwarded
- block
no telegrams are forwarded
5.1.4 Physical telegrams
This parameter is used to define the rule for forwarding telegrams whose recipient has a physical address
(telegrams that are used during point-point communication, for example when programming a device); The
values that can be set are:
- transmit all (for testing only)
all telegrams are forwarded
- block
no telegrams are forwarded
- filter (default value)
only the telegrams with an address present in the filter table are forwarded; remember that ETS
automatically generates the filter tables for each coupler
5.1.5 Physical: Repetition if errors on sub line
This parameter is used to enable the repetition of telegrams generated by the coupler if there is a
transmission error on the sub line (e.g. due to a receiver failure); in particular, this parameter refers to
telegrams whose recipient has a physical address. The values that can be set are:
- no
no repetition in case of an error
- normal (default value)
in case of an error, the telegram is repeated up to a maximum of 3 attempts
- limited
in case of an error, the telegram is repeated only once

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5.1.6 Group: Repetition if errors on sub line
This parameter is used to enable the repetition of telegrams generated by the coupler if there is a
transmission error on the sub line (e.g. due to a receiver failure); in particular, this parameter refers to
telegrams whose recipient has a group address. The values that can be set are:
- no
no repetition in case of an error
- normal (default value)
in case of an error, the telegram is repeated up to a maximum of 3 attempts
- reduced
in case of an error, the telegram is repeated only once
5.1.7 Telegram confirmations on line
This parameter defines the rule for confirming telegrams (ACK) transmitted on the sub line. The values that
can be set are:
- if routed (default value)
the device sends the confirmation telegram for only the telegrams transmitted on the sub line that are
forwarded on the main line
- always
the device sends the confirmation telegram for all telegrams on the sub line, regardless if they are
forwarded or not
5.1.8 Send confirmation on own telegrams
This parameter is used to enable the function for automatically sending the confirmation telegram (ACK) for
the telegrams sent by the device on the sub line. The values that can be set are:
- no (default value)
when the device sends a telegram on the sub line, it does not send the confirmation telegram (ACK) for
that telegram; the telegram will be confirmed possibly by the devices on the sub line
- yes
when the device sends a telegram on the sub line, it also automatically sends the confirmation telegram
(ACK) for that telegram, which does not need to be confirmed by the devices on the sub line

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6 “General”menu (Repeater)
The General menu contains the parameters used to define the manual function of the local button key.
The basic structure of the menu is as follows:
Fig. 6.1
6.1 Parameters
6.1.1 Fallback time for manual operation
The manual function activated by the device's local button key can be deactivated by pressing the button key
or automatically after the preset time defined via the parameter “Fallback time for manual operation”
elapses. The values that can be set are:
-10 min
-1 hour (default value)
-4 hours
-8 hours
6.1.2 Manual function
This parameter can be used to define the manual function activated by the button key; the manual function
makes it possible to temporarily change the telegram forwarding rules. The parameter may have the
following values:
- disabled
- pass all telegrams (default value)
- pass physical telegrams
- pass group telegrams

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7 "Main line" menu (Repeater)
The Main line menu contains the parameters used to define the rules for forwarding telegrams from the main
line to the sub line.
The basic structure of the menu is as follows:
Fig. 7.1
7.1 Parameters
7.1.1 Configuration
This parameter can be used to select the rule for forwarding telegrams from the main line to the sub line from
a preset list of rules; based on the selection made, the subsequent parameters are configured as a result;
The values that can be set are:
- group, physical: route (default value)
- configure
by selecting configure, all the other parameters present in the configuration menu will be configurable.
Selecting group, physical: route, the parameters can be consulted but their value is preset and cannot be
changed.
7.1.2 Physical telegrams
This parameter is used to define the rule for forwarding telegrams whose recipient has a physical address
(telegrams that are used during point-point communication, for example when programming a device); The
values that can be set are:
- transmit all (default value)
all telegrams are forwarded
- block
no telegrams are forwarded
NOTE: The telegrams whose recipient has a group address are always forwarded.

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7.1.3 Physical: Repetition if errors on main line
This parameter is used to enable the repetition of telegrams generated by the repeater if there is a
transmission error on the main line (e.g. due to a receiver failure); in particular, this parameter refers to
telegrams whose recipient has a physical address. The values that can be set are:
- no
no repetition in case of an error
- normal
in case of an error, the telegram is repeated up to a maximum of 3 attempts
- reduced (default value)
in case of an error, the telegram is repeated only once
7.1.4 Group: Repetition if errors on main line
This parameter is used to enable the repetition of telegrams generated by the repeater if there is a
transmission error on the main line (e.g. due to a receiver failure); in particular, this parameter refers to
telegrams whose recipient has a group address. The values that can be set are:
- no
no repetition in case of an error
- normal
in case of an error, the telegram is repeated up to a maximum of 3 attempts
- reduced (default value)
in case of an error, the telegram is repeated only once
7.1.5 Telegram confirmations on main line
This parameter defines the rule for confirming telegrams (ACK) transmitted on the main line. The values that
can be set are:
- if routed
the device sends the confirmation telegram for only the telegrams transmitted on the main line that are
forwarded on the sub line
- always (default value)
the device sends the confirmation telegram for all telegrams on the main line, regardless if they are
forwarded or not
7.1.6 Send confirmation on own telegrams
This parameter is used to enable the function for automatically sending the confirmation telegram (ACK) for
the telegrams sent by the device on the main line. The values that can be set are:
- no
when the device sends a telegram on the main line, it does not send the confirmation telegram (ACK) for
that telegram; the telegram will be confirmed possibly by the devices on the main line
- yes (default value)
when the device sends a telegram on the main line, it also automatically sends the confirmation telegram
(ACK) for that telegram, which does not need to be confirmed by the devices on the main line

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8 "Sub line" menu (Repeater)
The Sub line menu contains the parameters used to define the rules for forwarding telegrams from the sub
line to the main line.
The basic structure of the menu is as follows:
Fig. 8.1
8.1 Parameters
8.1.1 Configuration
This parameter can be used to select the rule for forwarding telegrams from the sub line to the main line from
a preset list of rules; based on the selection made, the subsequent parameters are configured as a result;
The values that can be set are:
- group, physical: route (default value)
- configure
by selecting configure, all the other parameters present in the configuration menu will be configurable.
Selecting group, physical: route, the parameters can be consulted but their value is preset and cannot be
changed.
8.1.2 Physical telegrams
This parameter is used to define the rule for forwarding telegrams whose recipient has a physical address
(telegrams that are used during point-point communication, for example when programming a device); The
values that can be set are:
- transmit all (default value)
all telegrams are forwarded
- block
no telegrams are forwarded
The telegrams whose recipient has a group address are always forwarded.

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8.1.3 Physical: Repetition if errors on sub line
This parameter is used to enable the repetition of telegrams generated by the repeater if there is a
transmission error on the sub line (e.g. due to a receiver failure); in particular, this parameter refers to
telegrams whose recipient has a physical address. The values that can be set are:
- no
no repetition in case of an error
- normal
in case of an error, the telegram is repeated up to a maximum of 3 attempts
- reduced (default value)
in case of an error, the telegram is repeated only once
8.1.4 Group: Repetition if errors on sub line
This parameter is used to enable the repetition of telegrams generated by the repeater if there is a
transmission error on the sub line (e.g. due to a receiver failure); in particular, this parameter refers to
telegrams whose recipient has a group address. The values that can be set are:
- no
no repetition in case of an error
- normal
in case of an error, the telegram is repeated up to a maximum of 3 attempts
- reduced (default value)
in case of an error, the telegram is repeated only once
8.1.5 Telegram confirmations on line
This parameter defines the rule for confirming telegrams (ACK) transmitted on the sub line. The values that
can be set are:
- if routed
the device sends the confirmation telegram for only the telegrams transmitted on the sub line that are
forwarded on the sub line
- always (default value)
the device sends the confirmation telegram for all telegrams on the sub line, regardless if they are
forwarded or not
8.1.6 Send confirmation on own telegrams
This parameter is used to enable the function for automatically sending the confirmation telegram (ACK) for
the telegrams sent by the device on the sub line. The values that can be set are:
- no
when the device sends a telegram on the sub line, it does not send the confirmation telegram (ACK) for
that telegram; the telegram will be confirmed possibly by the devices on the sub line
- yes (default value)
when the device sends a telegram on the sub line, it also automatically sends the confirmation telegram
(ACK) for that telegram, which does not need to be confirmed by the devices on the sub line

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LAST REVISION 02/2016 code 7.01.8.063.3