Littfinski Daten Technik SA-DEC-4-MM-F User guide

Littfinski DatenTechnik (LDT)

Operating Instruction

Connecting the decoder to your

4-fold switch decoder

from the Digital-Professional-Series !

SA-DEC-4-MM-F Part-No.: 210312

(With possible external power supply)

>> finished module <<

Compatible to Märklin-Motorola-Format:

(e.g. Märklin-Digital∼ [Control Unit, Central Station 1

und 2], Intellibox, EasyControl, ECoS, KeyCom-MM,

DiCoStation, EDiTS, EDiTS pro and others)

For digital control of:

⇒ consumers up to 4 Ampere on each output

(e.g. illumination, disconnection of track sections from
power).

⇒ jammed turnout- and signal drives

(drives with integrated end switch).

This product is not a toy! Not suitable for children under 14 years of age!
The kit contains small parts, which should be kept away from children under 3!
Improper use will imply danger of injuring due to sharp edges and tips! Please
store this instruction carefully.

CE Part-No.:

21 21 48

red point

Introduction/Safety instruction:

You have purchased the 4-fold switch decoder SA-DEC-4 for
your model railway as a kit or as finished module.
The SA-DEC-4 is a high quality product that is supplied within
assortment of Littfinski DatenTechnik (LDT).

We wish you having a good time using this product.
The switch decoder SA-DEC-4 of the Digital-Professional-

Series can be easily installed and used on your digital railway.

The colored point on the receiver device indicates to which
digital system the decoder can be adapted.

In case the receiver device is marked red the decoder is
suitable for Märklin-Digital~ respectively for Märklin-Motorola
layouts.

In case the receiver device is marked yellow the SA-DEC-4
will be suitable for the DCC Data format, used for instance at
the systems of Lenz-Digital Plus, Arnold-, Märklin-Digital=,

Intellibox, TWIN-CENTER, Roco-Digital, EasyControl, ECoS,
KeyCom-DC, Digitrax, DiCoStation and Zimo.

The decoder SA-DEC-4 is multi digital and can be installed to
the Intellibox without any problems.

The finished module comes with 24 month warranty.

• Please read the following instructions carefully. Warranty will
expire due to damages caused by disregarding the operating
instructions. LDT will also be not liable for any consequential
damages caused by improper use or installation.

digital model railway layout:

• Attention: Before starting the installation switch off the

drive voltage by pushing the stop button from the
command station or disconnect the main supply.

The decoder receives the digital information via the clamp
KL2. Connect the clamp with a rail or even better connect the

clamp directly to the command station or to a booster assuring
supply of digital information free from any interference.

Pay attention to the mark at clamp KL2. The color markings
'Black/Schwarz' and 'Red/Rot' next to the clamp are used for
Arnold-Digital (old) and Märklin-Digital= .

Other systems are using the letters 'J' and 'K'.
If you use the decoder for a Märklin-Digital~ respectively

Märklin-Motorola installation please attend to the colors marks
'red/rot' and 'brown/braun'.

The decoder receives the power supply via clamp KL1.
Voltage in the range of 14 to 18V~ is acceptable (alternate
current output of a model railway transformer).

If you do not want to supply power to the decoder SA-DEC-4
from an external transformer you can connect the clamp KL1
to KL2 with two wires. In this case the decoder will get the
power supply complete from the digital system.

Now connect the consumers (e.g. illumination, motors or
turnout- and signal coils) to the outputs 1 to 4. The contact
marked 'COM' is the common connection for the bistable relay.

Programming the decoder address:

For programming the decoder address you have to connect a
consumer to the output 1. As it is possible to hear the switching
of the bistable relay the connection of a consumer is not
mandatory.

Littfinski DatenTechnik (LDT)

Rev. 2.2
SA-DEC-4

Accessory Decoder

4fach Schaltdecoder

R2

D1

C6

D2

R6

R5

C7

IC5

CR1

CNY17

C3

Black Red

K J

red brown

14..18V~

KL1

B80C1500

R1

GL1

R9

R4

R3

D3

KL2

KL6

IC1

1 2

Relais

Z86E0...

Relais

C5

93C46

IC4

R7

C4

S1

COMCOM

KL4KL3

Relais

REL2

REL1

IC3

D4

ULN2803

Relais

• Switch on the power supply of your model rail way.

REL3

REL4

KL5

COM COM

3 4

• Depress the programming key S1. Do not touch the
integrated circuits of the pc-board because any electrostatic
discharge can destroy the IC`s.

• The relay connected to output 1 will now switch
automatically every 1,5 seconds. This indicates that the
decoder is in the programming mode.

• Depress now one key of the group which you want to assign

brown

to the decoder. For programming the decoder address you
can also release a turnout switch signal via a personal
computer.

Remarks: The decoder addresses for magnet accessories
are combined in groups of four. The address 1 to 4 build the
first group. The address 5 to 8 build the second group etc.
Each SA-DEC-4 decoder can be assigned to any of these
groups. Which of the 4 turnouts of a group will be activated
for the addressing does not matter.

• If the decoder has recognized the assignment correctly the
relay will move a little faster. Afterwards the movement
slows down to the initial 1,5 seconds interval again.

• In case the decoder will not recognize the address it could
be that the two digital information connections (clamp 2) are
wrong connected. For testing this, switch off the system
exchange the connection on KL2 and start the programming
again.

• Leave the programming mode by depressing the
programming key S1 again. The decoder address is now
permanently stored but can be changed at any time by
repeating the programming as described above.

• If you depress the first key of the programmed group of keys
or you send a switch signal for this turnout from a PC the
addressed bistable relay should now switch the connected
consumer on or off.

Please attend to the following:

• All 4 outputs can switch consumers with up to 4 Ampere.

Decoder application:

Besides the switching of illumination and motors there is an
excellent application for the decoder SA-DEC-4 of digital
switching the Märklin gauge 1 drives (e.g. 5625).

As an advantage large current consuming drives will not
unnecessary overload the expensive digital power supply.

The following draft shows the wiring.

transformer

L

14..18V~

KL2KL1

SA-DEC-4

1
2

red

4
3

gauge 1 turnout

2

drives 5625

Feed the SA-DEC-4 via KL1 witch AC from the model railway
transformer. Further connect one cable of the transformer with
clamp 'L' at the turnout drive. Connect the second cable of the
transformer with the clamp marked with 'COM' on the
respective decoder output.

Now, connect the two remaining clamps of the decoder output
with the outputs 1 and 2 of the turnout drive.

Further examples can be found on the web-Site
(www.ldt-infocenter.com) in the download section.

A solid low cost housing is available for the decoder SA-DEC-

4. Please consult our Web-Site for further details.

1

Trouble shooting:

What to do if something is not working as described above?
If you have purchased the decoder as a kit, please carefully

check all parts and soldered joints.
Here some possible functional errors and possible solutions:

1. During programming of the decoder addresses the relay
on output moves within 1,5 seconds, but does not confirm the
programming with faster movement by depressing any key.

• Change cable connections at KL2.

• Interfered digital information at KL2 respectively lost of

voltage at the tracks! Connect the decoder directly with
cables to the digital control unit or to the booster instead to
the tracks.

• Eventually the clamps have been tightened to strong and
therefore the clamps got loose at the soldering to the pc
board. Check the soldering connection of the clamps at
the lower side of the pc-board and re-solder them if
required.

• For kits: Is IC5 correct inserted into the socket? Value of
R6 actually 220kOhm or mixed up with R5 18kOhm?

2. The programming of the decoder address functions as

described, nevertheless the connected consumers will not be

activated.

• Interfered digital information on KL2 respectively larger

lost of voltage at the tracks result to unsafe data

transfer! Connect the decoder directly with cables to the
command station or the booster.

• For kits: Is IC4 correct inserted into the socket?

Further products within the Digital-Professional-

Series:

S-DEC-4
4-fold turnout decoder for 4 magnet accessories with free

programmable decoder addresses and possible external power
supply.

M-DEC
4-fold decoder for motor driven turnouts. For motors up to

1A. With free programmable decoder addresses. Drives can be
connected directly with the decoder output.

LS-DEC
Light signal decoder for up to 4 LED train signals. Signal

aspects will be originally dimmed up and down and directly
positioned via the decoder address.

RM-88-N / RM-88-N-O
16-fold feedback modules (also with integrated opto-

couplings) for the s88-feedback bus and the connection to
Memory and Interface (Märklin / Arnold), Central Station 1
and 2, ECoS, Intellibox respectively TWIN-CENTER,

EasyControl, DiCoStation and HSI-88.
RM-GB-8-N

8-fold feedback module with integrated track occupancy
detectors for the s88-feedback bus.

All components can be purchased as easy to assemble
complete kits, as finished modules or as ready finished
modules in a case.

Littfinski DatenTechnik (LDT)

D-25492 Heist/Germany

Phone: [phone] / 977 381

Fax: [phone] / 977 382

Internet: http://www.ldt-infocenter.com

Subject to technical changes and errors.  03/2014 by LDT

Arnold, Digitrax, Lenz, Märklin, Motorola, Roco and Zimo are

Made in Europe by

Kleiner Ring 9

registered trade marks.