Quick Reference Guide

KNX SECURE COUPLER

Article No. 10351
(Revision 09.2026)

BAB TECHNOLOGIE GmbH
Hafenpromenade 1–2
44263 Dortmund
Germany

Phone: +49 (0) 231 / 476 425-30
Fax: +49 (0) 231 / 476 425-59
info@bab-tec.de
http://www.bab-tec.de

Made in Germany

SAFETY INFORMATION

To prevent damage and hazards, read and observe the following safety instructions.

These operating instructions are an integral part of the product and must be retained.

System Information

The device supports firmware updates using ETS version 6.4.0 or later.

The device supports KNX Data Secure. KNX Data Secure protects building automation systems against unauthorized access and manipulation and can be configured within an ETS project.

For Secure Commissioning, the Device Certificate attached to the device is required. Remove the Device Certificate from the device before commissioning and keep it in a safe place.

The following ETS versions are supported for planning, installation, and commissioning:

Device Overview

• (1) KNX bus terminal – subordinate line

• (2) Run status LED

• (3) Main status LED

• (4) Sub status LED

• (5) Mode status LED

• (6) Pass IA button

• (7) Pass GA button

• (8) Programming LED (red)

• (9) PROG. programming button

• (10) KNX bus terminal – superordinate line

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LED Functions

Run Status LED

Indication	Description
Off	Power failure on the superordinate line
Green (steady)	Device ready for operation. The superordinate and subordinate lines are supplied with power.
Red (steady)	Power failure on the subordinate line
Orange (steady)	Group address filter is disabled
Orange flashing (approx. 1 Hz)	Physical address filter is disabled
Orange flashing rapidly (approx. 4 Hz)	Both filter functions are disabled

Main Status LED

Indication	Description
Orange (6 ms)	Telegram received on the superordinate line
Red (6 ms / 100 ms)	Communication error on the superordinate line

Note

Error indications have priority over telegram reception indications.

Sub Status LED

Indication	Description
Orange (6 ms)	Telegram received on the subordinate line
Red (6 ms / 100 ms)	Communication error on the subordinate line

Note

Error indications have priority over telegram reception indications.

Mode Status LED

Indication	Description
Off	Device operates as an Area Coupler or Line Coupler
Green (steady)	Device operates as a Segment Coupler or Line Repeater
Orange (steady)	Device operates as an Area Coupler, Line Coupler, or Segment Coupler with Secure Proxy enabled
Red (100 ms)	The Pass IA or Pass GA button has been pressed

Status LED Self-Test

During startup, the status LEDs illuminate sequentially from top to bottom for 0.5 seconds, first green and then red.

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Intended Use

• Connects two KNX lines, segments, or areas for data communication while providing galvanic isolation between them.

• Operates as an Area Coupler, Line Coupler, or Segment Coupler (with ETS 6.1.1 or later), or as a Line Repeater (with ETS 5.7.7).

• Designed for installation in distribution boards on a DIN rail in accordance with IEC 60715.

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Applications

Refer to the technical documentation for detailed information.

The assigned physical address must correspond to the logical topology of the KNX installation.

Area and Line Coupler

Figure 1: Operation as an Area and Line Coupler

• Area Coupler (AC): The physical address corresponds to that of an Area Coupler (X.0.0). Can be operated with or without filtering.

• Line Coupler (LC): The physical address corresponds to that of a Line Coupler (X.Y.0). Can be operated with or without filtering.

Segment Coupler and Line Repeater

Figure 2: Operation as a Segment Coupler and Line Repeater

• Segment Coupler (SC): The physical address corresponds to that of a standard KNX bus device (X.Y.Z, Z ≠ 0). Used to divide a KNX line (maximum 256 devices) into independent line segments. Can be operated with or without filtering.

• Line Repeater (LR): The physical address corresponds to that of a standard KNX bus device (X.Y.Z, Z ≠ 0). Used to divide a KNX line (maximum 256 devices) into independent line segments. Regenerates and repeats telegrams within a KNX line. Filtering is not available.

Abbreviations

• HL – Backbone Line

• AL – Area Line

• TLN – Bus Device

• PS – KNX Power Supply

• CH – Choke

Operation

Enabling and Disabling the Filter Functions

• Press the Pass IA button to enable or disable the filter function for physical addresses.

• Press the Pass GA button to enable or disable the filter function for group addresses.

→ The Mode status LED lights up red briefly.

→ The Run status LED indicates the current status of the filter functions (see Device Overview).

Information for Qualified Electricians

Installation and Electrical Connection

Secure Operation

Before commissioning the device with KNX Data Secure, complete the following steps:

• Enable Secure Commissioning in the ETS.

• Remove the Device Certificate from the device and store it in a safe place.

• Enter or scan the Device Certificate and add it to the project.

• Recommendation: Use a high-resolution camera to scan the QR code.

• Document all passwords and keep them in a secure location.

Installing and Connecting the Device

• Observe the specified cable routing and the required cable clearances.

• Mount the device on a DIN rail.

• Connect the bus cables to the KNX bus terminals (see Device Overview), observing the correct polarity.

• Connect the superordinate line to the lower bus terminal (10). The device is powered via this connection.

• Connect the subordinate line to the upper bus terminal (1).

• Fit the protective caps to the KNX terminals to protect against hazardous voltages.

Commissioning

Programming the Physical Address and Application Program Using ETS

• Switch on the KNX bus voltage.

• Press the PROG. (9) programming button.

  • The Programming LED (8) lights up.

• Program the physical address.

• Download the application program and the filter table.

Safe State Mode

Safe State Mode stops execution of the loaded application program.

Activating Safe State Mode

• Switch off the KNX bus voltage or disconnect the KNX bus terminal (10) of the superordinate line.

• Wait approximately 15 seconds, then press and hold the programming button.

• Switch the KNX bus voltage on again or reconnect the KNX bus terminal.

• Release the programming button only when the Programming LED starts flashing slowly.

→ Safe State Mode is activated.

Deactivating Safe State Mode

• Switch off the KNX bus voltage for approximately 15 seconds, or

• Restart the device using the ETS.

Master Reset

A Master Reset restores the device to its factory default settings.

The physical address is reset to 15.15.0. The installed firmware remains unchanged.

After the reset, the device must be recommissioned using the ETS.

Performing a Master Reset

Requirement: Safe State Mode must be active.

• Press and hold the programming button for more than 5 seconds.

  → The Programming LED flashes rapidly.

• Release the programming button.

  → The device performs a Master Reset, restarts automatically, and is ready for operation again after approximately 5 seconds.

Technical Data

• Ambient temperature: −5 ... +45 °C

• Storage/transport temperature: −25 ... +70 °C

• Protection class: III

• Weight: 90 g

• Installation width: 18 mm / 1 DIN module

• KNX medium: TP256

• Commissioning mode: S-Mode

• KNX rated voltage: DC 21 ... 32 V SELV

• KNX current consumption:

  • Superordinate line: 9 mA

  • Subordinate line: 5 mA

• KNX connection type: KNX bus terminal

Disposal Information

DE: Disposal Obligations

The symbol of the crossed-out wheeled bin indicates the following obligations in accordance with applicable legislation:

• At the end of its service life, this electrical device must be disposed of separately from unsorted municipal waste and taken to an appropriate collection and recycling facility.

• Waste batteries, rechargeable batteries, and lamps that are not permanently enclosed within the device and can be removed without damage must be removed before disposal and disposed of separately.

• Distributors of electrical equipment and waste collection facilities are required to accept waste electrical equipment free of charge.

• Any personal data stored on the electrical device must be deleted by the user before disposal.

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