LDT Digital-Professional Series User manual

Littfinski DatenTechnik (LDT)
Operating Instruction
16-fold feedback module
from the Digital-Professional-Series!
RM-DEC-88-G Part-No.: 310313
As s88 with 16 inputs.
>> finished module in a case <<
For connection to the following digital units:
⇒INTERFACE (up to 31 modules)
Märklin-Digital∼/= and Arnold-Digital
⇒MEMORY (up to 3 modules)
Märklin-Digital∼/= and Arnold-Digital
⇒Intellibox / TWIN-CENTER (up to 31
modules) Uhlenbrock/Modeltreno / Fleischmann
⇒High Speed Interface (up to 31 modules)
Littfinski DatenTechnik (LDT)
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 years of
age! Improper use will imply danger of injuring due to sharp edges and tips!
Please store this instruction carefully.
Introduction / Safety Information:
You have purchased the feedback module RM-DEC-88 for your
digital model railway.
The RM-DEC-88 is a high quality product which is supplied
within the Digital-Professional-Series of Littfinski
DatenTechnik (LDT).
We are wishing you having a good time using this product.
The finished modules come with a 2-years warranty.
•Please read the following instructions carefully. Warranty will
expire due to damages caused by disregarding the operating
instructions. LDT will also not be liable for any consequential
damage caused by improper use or installation.
Connecting the module to your digital
layout:
•Attention: Please switch off your model railway by
disconnecting the transformers from AC-current before
starting any installation.
•Connect the 6-pole plug to the Märklin-INTERFACE,
Märklin-MEMORY, Intellibox or TWIN-CENTER or existing
s88 feedback modules with the direction of the
connection cable to the bottom side. The plugs of further
connected feedback modules have to be connected in a
way to the 6-pole pin-plug-bar that the cable will be
directed away from the pc-board. The white marking at
one side of the pin-plug-bar has to correspond to the
white single wire of the s88-bus cable of the following
modules.
General Functions:
The feedback module RM-DEC-88 with 16 inputs is 100%
compatible to the s88.
L ittfinski D aten T echnik
D-25492 Heist
www.ldt-infocenter.com
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8 7 6 5 4 3 2 1
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Peter Littfinski DatenTechnik
Rueckmeldedecoder RM-DEC-88
16-channel feedback modul
Rev. 3.0
rosa
gelb gruen
braun weiss grau
INOUT
ST1
ST2
Digital-Profi werden!
16 Rückmeldeeingänge für den
s88-Rückmeldebus.
Rückmeldemodul
RM-DEC-88
The feedback module RM-DEC-88 is suitable for decentralized
installation below the model railway layout. There are 4 bores
available for quick and easy installation.
The modules can be connected to each other by a bus-cable of
75cm length. In case this distance has to be extended it is
possible to order a 2 meter cable extension under order code
Kabel s88.
Connection to Märklin-Memory /
INTERFACE, Intellibox / TWIN-CENTER or
High Speed Interface HSI-88:
Up to 3 feedback modules can be connected to each
MEMORY.
The feedback signals of up to 31 modules can be evaluated by
connection to Märklin-INTERFACE, Intellibox or TWIN-
CENTER and HSI-88.
After switching on the power to the digital system the feedback
modules will be numerical identified at the sequence as they are
connected to the central unit.
For example, the first feedback module directly connected to
the MEMORY will be addressed to the key-group A1 to A8.
Contacts 1 to 8 of the MEMORY will perform switching tasks
(like a request of a drive-track) whereas contacts 9 to 16 are
responsible for circuit release (e.g. hold tracks occupied).
Märklin-INTERFACE, Intellibox or TWIN-CENTER and HSI-
88 do not use this kind of differences of subdivisions at
switching and release. All 16 inputs have equal access
(activated or not activated).
If you intend to extend your model railway with RM-DEC-88
feedback modules you can easily combine these with any
existing s88 modules.
Please make sure that the digital layout has been switched
off when connecting the decoders with the 6-pole plug.
Check carefully the correct orientation of the plugs.

Connection of contacts:
1. Three-rail conductor system:
With the feedback module RM-DEC-88 all contacts can be
connected which are switched to ground (brown cable).
Therefore it can either be switched against the input clamp of
the feedback module marked with ⊥or to the connection 0
(brown) of the rail.
Switch rails, contact rails and reed contacts can be
connected to the clamps 1 to 16 of the feedback module as
shown below:
Type of contact
1 2 3 4 1 2 3 4 1 2 3 4
Schaltgleis
Kontaktgleis Reedkontakt
Kontaktart
switch track contact track
reed contact
At section 2 you can find a further possibility to connect reed
contacts to the RM-DEC-88. The second connection of the reed
contact will not be soldered to input 0 of the rail but connected
to the ground clamp (⊥) at the feedback module.
All shown above connections conform exactly to the wiring
known from the s88.
For further examples please visit our web-site (www.ldt-
infocenter.com) at the section "Downloads"and "Sample
Connections". Beside the single sample-connections we
recommend the file "rmdec_info_engl" at the section
"Downloads".
The 16 inputs of the feedback module RM-DEC-88 and s88
are reacting very sensitive to electrical interferences.
Therefore no current-carrying wires (e.g. digital voltage) should
cross the cables, which are connecting the inputs of the
feedback modules.
Especially the simple occupied track report via contact rails
can lead to problems as the isolated rail and the connection
cable to the feedback module can easily catch electrical
interference. As a result the input can be switched temporarily
to "occupied"although no train is on the respective track
section.
This can be avoided by using our feedback module RM-DEC-
88-Opto which is insensitive against interferences due to
preconnected opto coupling inputs.
If the connection wires to the contacts are very long and
installed very narrow it can even come to some signal transfer
between two wires. Although only one section is actually
occupied some more sections can be reported to be occupied.
This can be avoided by using suppress-or decoupling
diodes before the single feedback inputs. A sample wiring can
be found on our web-site at the section "Sample
Connections".
2. Two-rail conductor system:
If you use reed contacts or other potential-free contacts for
feedback signals on your layout please install the wiring to the
feedback decoder RM-DEC-88 as shown at the below circuit.
1
2
3
4
Reedkontakt
reed contact
Even the shortest switch impulses will be transferred from the
feedback module as they will be stored until the control unit will
request this information via the feedback bus.
Feedback modules from our Digital-Professional-Series are
easy to use with your digital model railroad, as they are 100%
compatible with the s88 feedback bus.
Further products from our Digital-Professional-
Series:
S-Dec-4
4-fold turnout decoder for four magnet accessories with free
programmable decoder address and external power supply
possibility.
SA-DEC-4
4-fold switch decoder with four bistable relays and free
programmable decoder address and external power supply
possibility.
RM-DEC-88-Opto
16-fold feedback module with integrated opto couplings for the
s88-feedback bus for connection to MEMORY and INTERFACE
(Märklin/Arnold), Intellibox or TWIN-CENTER and HSI-88.
RM-GB-8
8-fold feedback module with integrated occupancy
detectors for the s88 feedback bus.
Made in Europe by
Littfinski DatenTechnik (LDT)
Kleiner Ring 9
D-25492 Heist/Germany
Phone: [phone] / 977 381
Fax: [phone] / 977 382
Internet: http://www.ldt-infocenter.com
Subject to technical changes and errors. 05/2006 by LDT
Märklin and Arnold are registered trademarks.