User manual

1 2 3 4 1 2 3 4 1 2 3 4
Schaltgleis
Kontaktgleis
Reedkontakt
Kontaktart
Type of contact
switch track
contact track
reed contact
Ref Ref Ref
All shown above connections conform exactly to the known
wiring of the s88.
There will be a small difference:
For transmitting an occupancy report is a small current flow
required at he opto-coupling inputs of the feedback module
RM-88-N-O. For this purpose shall be the reference input
(middle connection clamp marked with Ref) connected to the
digital current pole of the supply to the middle conductor.
At the tree-conductor system is this the pole with the cable
color “red”. From which booster this pole will be gathered does
no matter as long as all boosters have a common connection to
the system ground (brown).
Further sample connections can be found at the Internet on our
Web Site (www.ldt-infocenter.com) at the section “Downloads”
and “Sample Connections”. Beside the single sample
connections we recommend the file “RM-88_Info” within the
section “Downloads”.
The 16 opto-coupling inputs of the feedback module
RM-88-N-O have a high interference immunity.
Nevertheless if there will be any interferences is the reason
most that the connection cables 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 several sections can be reported to be
occupied.
The described problem can be solved by using interference
suppression diodes or decoupling diodes within the
connection wire to the reference input. A wiring sample can be
found on our Web Site at the section “Sample Connections”.
2.Two-conductor rail-system:
If you use reed contacts or other potential-free contacts for
feedback signals on your layout you can install the wiring to the
feedback module RM-88-N-O as shown at the below circuit.
Ref
1
2
3
4
1
2
3
4
Reedkontakt
Kontaktgleisschalter
reed contact
contact track switch
Ref
Model-railroader, using the Märklin-Digital= or Arnold-Digital-
System had in the past not the possibility to use the usual
contact-rail switches (e.g. Arnold 7440) for the feedback
report.
The RM-88-N-O contain opto-couplings at the input for the
required potential separation.
This makes the direct connection of contact-rail switches and
non-potential-free track occupancy monitors possible (see
the lower draft).
The above sample indicates that the Ref-clamp of the feedback
module RM-88-N-O has been connected to a pole (lower rail) of
the digital current.
The metallic wheel of a passing locomotive or railroad carriage
will produce via the contact-rail-switch an electrical connection
to the second pole (upper rail) of the digital current.
Even the shortest switch impulses will be transferred by the
feedback module RM-88-N-O because they will be stored via
the s88-feedback bus until the digital control unit or the
interface will request this information.
Feedback module from our Digital-Professional-Series are
easy to use on your digital model railroad, as they are 100%
compatible with the s88 feedback bus.
Accessories:
For safe installation of the feedback modules below your
model layout we offer an installation set under the order code
MON-SET and for the assembled kits a sturdy exact matching
case (order code: LDT-01).
Further products from our Digital-Professional-
Series:
RM-GB-8
8-fold feedback module with integrated occupancy
detectors for the s88 feedback bus.
S-DEC-4
4-fold turnout decoder for 4 magnet accessories with free
programmable decoder addresses and possible external power
supply.
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.  02/2013 by LDT
Märklin and Arnold are registered trademarks.
s88-N
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s88-N