merten REG-K Operating Instructions Download Page 2

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This device is a product of the KNX/EIB instabus-KNX/
EIB system and complies with KNX directives. Detailed 
technical knowledge obtained in KNX/EIB training cour-
ses is a prerequisite to proper understanding.The func-
tionality of this device depends on the software. 
Detailed information on loadable software and attainab-
le functionality as well as the software itself can be ob-
tained from the manufacturer's product database. 
Planning, installation and commissioning of the unit is 
effected by means of KNX-certified software. An up-
dated version of the product database and the technical 
descriptions are available in the Internet at www.mer-
ten.de.

The coupler connects two instabus KNX/EIB data lines 
and ensures the electrical separation of these lines 
from one another. The definite functions of the device 
are defined by addressing and parameterization.

Line coupler LK: 

Physical address X.0.0
Connection of a main line (HL) with an area line (BL). Al-
ternatively with or without filter function. The coupler 
belongs logically to the subordinate line. 

Area coupler BK: 

Physical address X.0.0
Connection of a main line (HL) with an area line (BL). Al-
ternatively with or without filter function. The coupler 
belongs logically to the subordinate line.  

Amplifier V: 

Physical address X.Y.Z 
Handling and repetition of telegrams on a line, no filter 
function. Division of a line into max. 4 independent line 
segments => max. 3 line amplifiers connected in paral-
lel per line (FIG. C). Each line segment requires a sepa-
rate power supply (SV) including a choke (DR).  

EIB-System Information

What you can do with the Area/Line 

Coupler

Schematics of an instabus KNX/EIB system  

Use as area and line coupler (BK and LK)

Use as line coupler LK and amplifier V

(TLN = bus subscriber, DR = choke, SV = instabus KNX/
EIB power supply)

Each line requires a separate power supply.

1

programming button 

2

programming LED, red

3

operation LED, green 

4

LED amber, incoming data on superordinate line 
(HL)

5

LED amber, incoming data on subordinate line Li-
nie (UL)

6

diagnosis LED, red

7

connecting terminal for superordinate line (HL)

8

connecting terminal for subordinate line (UL) 

Function of diagnosis LED ("DIAG") red 

LED off:

Telegrams are filtered or blocked 
(both directions)

LED on:

Telegrams are retransmitted 
without being filtered (at least one 
direction)

LED flashing:

error detected (as per error flags 
in device)

Controls and indicators 

TLN 

TLN

TLN

SV

DR

LK 

HL1

BK

 

SV

DR

TLN

TLN

TLN

SV

DR

LK

 

HL2

BK 

BL

SV

DR

SV

DR

TLN

TLN

SV DR

HL

SV DR

TLN

TLN

V

 

SV DR

TLN

TLN

V

 

SV DR

TLN

TLN

LK

 

SV DR

(2)
(1)

(3)

(5)

(6)

(4)

RUN
HL
UL
DIAG

HL

UL

(8) (7)

Function of operation LED ("RUN") green

LED off: 

device off, 
no voltage on superordinate line

LED on: 

device on, 
voltage on both lines

LED flashing: 

no voltage on subordinate line

1

The device is snap-fastened on the DIN rail until the 
latch is heard to engage, with the connecting termi-
nals pointing downwards 

2

The superordinate line is connected with the left-
hand terminal (terminal "HL"). This terminal sup-
plies power to the device electronics so that it is 
possible to report a bus voltage failure of the sub-
ordinate via the superordinate line.

3

The subordinate line is connected to the right-hand 
terminal (terminal "UL").

|

Removal info:

 Do not lever out the connecting 

termianal from below. Risk of shorting the bus 
voltage which is not available during the short-cir-
cuit.

¼

Risk of fatal injury from electrical current.

All work carried out on the device may only be per-
formed by skilled electricians. 
The country-specific regulations and the valid KNX 
guidelines must be followed.

1

Load the physical address into the push-button from 
the ETS via the KNX bus.

2

Complete the required configuration settings in the 
ETS, and transfer the configuration via EIB into the 
coupler.

Supply 

instabus KNX/EIB: 

21 - 30 V DC 
from superordinate line

Current consumption

superordinate line: 

approx. 6 mA  

subordinate line:

approx. 8 mA 

Connection: KNX/EIB 

instabus 

terminal

for superordinate and
subordinate line

Fitting: 

snap-fastening on DIN 
rail

Ambient temperature: 

-5 °C ... +45 °C

Storage temperature.: 

-25 °C ... + 70 °C

Type of protection: 

IP 20 in acc. with 
EN 60529

Safety class: 

III in acc. with 
EN 61140

Installation width: 

36 mm (2 modules)

Weight: 

approx. 90 g

Merten GmbH & Co. KG, 
Solutions for intelligent buildings
Service Center, Fritz-Kotz-Straße 8,
Industriegebiet Bomig-West
D-51674 Wiehl
Phone: +49 

2261 

702-204

Fax: +49 

2261 

702-136

E-Mail:

[email protected]

Internet: www.merten.de
InfoLine:
Phone:

+49 1805 212581* or +49 800 63783640

Fax:

+49 1805 212582* or +49 800 63783630

E-Mail:

[email protected]

* fee required

How to install the 

Area/Line Coupler

How to set up the Area/Line Coupler

Technical data

Area/Line Coupler REG-K

Operating instructions

Art.-Nr. 680204

RUN
HL
UL
DIAG

HL

UL

V68

02-

582

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0   

08/

06

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