Littfinski Daten Technik RS-8-F User manual

L ittfinski D aten T echnik (LDT)
Multi-Digital
feedback module
with integrated
8-fold occupancy detectors
for the RS-feedback bus
from the Digital-Professional-Series !
RS-8-F Part-No.: 300212
>> finished module <<
⇒ monitors up to 8 different track sections
(current detection from 0,001[1mA] up to 3 ampere)
⇒ integrated voltage control
(avoiding “track free” feedback in case of power failures)
⇒ separated by opto coupler
(between track- power supply voltage and feedback bus)
⇒ compatible to RS-feedback bus)
(can be operated together with RS-16-O, LR101, LS100 etc.)
⇒ suitable for digital control:
Digital Plus from Lenz.
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.
Introduction / Safety Information:
You have purchased the 8-fold feedback module RS-8 with
integrated detection of track occupancy for your model railway.
The RS-8 is a high quality product that is supplied within the
assortment of Littfinski DatenTechnik (LDT).
We wish you having a good time using this product.
Our products are either available as kits or as finished modules.
The finished modules come with a 24 month warranty.
•Please read the following instructions carefully. Warranty will
expire due to damages caused by disregarding the operating
instruction. LDT will also be not liable for any consequential
damages caused by improper use or installation.
•Also, note that electronic semiconductors are very sensitive to
electrostatic discharges and can be destroyed by them.
Therefore, discharge yourself before touching the modules on
a grounded metal surface (e.g. heater, water pipe or protective
earth connection) or work on a grounded electrostatic
protection mat or with a wrist strap for electrostatic protection.
Connection of the RS-8 with your digital model
railway:
•Attention: Please switch off your digital control unit and
unplug the transformers from AC-current before starting
connecting the unit.
•Power Supply: Connect the feedback module at the 4-
poles clamp with your model train transformer (14 to 18V
AC). It is also possible to connect the RS-8 module directly
to the digital circuit. In this case connect both clamps of
KL7 to clamp J and K of a power booster (LZV100 / LV101
/ LV102 / LV200).
Feedback bus: Connect the input R and S at the 4-pole
clamp to the identically marked clamps of the command
station LZ100 or LZV100. Further feedback modules (RS-8,
RS-16-O, LR101, LS100 etc.) have to be simply connected
in parallel.
Digital Current: Connect the clamps J and K at IN1 and IN2
of the 20-pole clamp with the identically marked clamps on
the power booster LZV100 / LV101 / LV102 / LV200).
General Functions:
The feedback module RS-8 combines the occupied track
detection and the feedback function. The 8 detectors for
occupied tracks work by detection of current. In cases a
connected track is occupied by an object with a minimum of
0,001 Ampere (1mA) consuming current, the track will be
detected as occupied.
Locomotive decoder, coach lights or resistance axles are
consuming electrical power and therefore induce the detection
of an occupied track.
The max. track current per output shall not exceed 3 Ampere.
A peak current of up to 7 Ampere is acceptable. The supply
booster has to identify the overload or short circuit and has to
switch off.
The track voltage (digital current circuit), the power supply and
the feedback bus are separated by opto galvanic.
The current for the tracks can therefore safely be supplied from
different transformers without having a negative effect on the
power booster (LZV100 / LV101 / LV102 / LV200).
The modular concept of occupied track detectors and
feedback decoders implements a considerable problem: As
soon as there is no electrical power on the tracks, all tracks are
detected as free because no consuming current is detected.
There are track occupied detectors available on the market which
use an auxiliary voltage to solve this problem, but this can
influence sometimes the locomotive decoder causing
disturbances and is therefore no suitable solution.
As the feedback module RS-8 has a build-in intelligence
(microprocessor Z86... [IC1], we have integrated a solution called
voltage-monitor. In case of voltage drop or short circuit there is
no inaccurate “free track” detection reported back via the
feedback bus to the digital control unit or the PC. All track
occupancies will be “frozen” during this phase of voltage
interruption.
As soon as there is current on the tracks again the actual
situations on the tracks will be detected and reported back via
the feedback bus.
The feedback modules RS-8 are suitable for decentralize
installation underneath the model railway installation. There are
4-bores on the edges of the modules for quick and easy
installation. A suitable assembly kit (distance spacers and wood
screws) is available under the order code MON-SET.
With order code LDT-02 is a suitable case for the RS-8 available.
The modules are connected with each other’s via the
RS-feedback bus (cables to the connecting clamps R and S).
Therefore each feedback module gets it’s own individual address
which is unique and cannot be allocated a second time by
another module.
Operating Instruction

Assigning addresses of the feedback module
RS-8:
Addresses for feedback tasks at the Digital plus System are
located in the area from 1to 128. To assure a definite feedback
each address can only be assigned once.
In addition the feedback address area is subdivided. Area 1to 64
is reserved for turnout decoders with feedback function.
Feedback modules like the RS-8 should therefore be addressed
in the area between 65 and 128 to avoid overlapping.
Therefore the LDT RS-8 feedback module is delivered with the
default address 65.
To change the address the RS-8 is equipped with a
programming key S1 and a red light diode. By pushing the
programming key once the diode will flash which means that
the RS-8 is ready for programming.
Programming mode will only work, if the Jand Kclamps at IN1
and IN2 of the 20 pole clamp are properly connected to the
digital circuit (see description above).
While the diode is flashing, you can assign the feedback address
with the hand controller LH100. Press the keys >F< and >5< to
get into the mode “magnet accessories”. Enter the requested
feedback address now (e.g. >7< >4< for 74) and press
>ENTER<. By pressing key >+< or >-< the feedback address
input will be saved. The diode will switch off if the module has
accepted the address. The RS-8 is now in operation mode again.
By pressing the keys >ESC<, >F< and >6< on the LH100 you will
get into the mode “feedback”. Enter the previously assigned
address (e.g. >7< and >4< for 74) and press >ENTER<.
If the RS-8 was connected properly to the RS-feedback bus, the
display of the hand control LH100 will show a “b” left below the
assigned feedback address.
When there was no feedback information received from the RS-
8the display of the LH100 shows a hyphen behind the feedback
address. Check the connection of your RS-8 and repeat
programming as described above.
If you wish to control the module with a renewed model of the
manual controller or with another central unit with R/S interface,
you should read the respective operation manual at the section
“Turnout / Signal settings” respectively “Feedback reports”.
Connecting a track section:
Following figure shows how to connect the feedback module
RS-8 with a track.
The monitored isolated track sections will get the digital current
supply via clamp 1 to 8. It is required that one rail is isolated.
Detailed Sample Connections are available on our web site
(www.ldt-infocenter.com) under “Downloads”.
For assembling 2 different power booster (LZV100 / LV101 /
LV102 / LV200) the RS-8 is divided into 2 x 4 track occupancy
controller. The output 1 to 4 gets the supply via the input
clamps IN1 and the output 5 to 8 via IN2. Therefore, it is simply
possible to monitor up to 4 track sections in a reversing loop.
For this application a reverse loop module (e.g. LK100) has to
be assembled between the power booster and the input clamp
IN1.
Please pay attention to the identification J and Kat the clamps
IN1 and IN2 as well as on the power booster.
To avoid short circuits when locomotives are crossing the
transitions of each detected track, the sequence of connecting
the tracks has to be always strictly followed.
RS-8
digital current from
command station
or booster
Digitalstrom von
Steuereinheit oder
Booster
Normalgleis
standard track Überwachte Gleisbereiche monitored track areas
KL7 KL8
Vom Modellbahntrafo
RS-Rückmeldebus
RS-feedback bus
From transformer
1 2 3 4
IN1 IN2
K J K J
5 6 7 8
Therefore, the OUTPUT clips are marked with a continuous and
a non-continuous line. Cables marked with Jalways connected
to the clips with a continuous line.
In case of a short circuit when crossing the transition (control unit
will switch to STOP) please change the cables at the respective
OUTPUT clamps of the monitored section.
Anti-interference capacitor can lead to an erroneous occupied
detection of the track and should therefore not be used within the
monitored track sections.
If you apply electrical resistant coating to the axles of your
trains, you should measure the resistance value with a Multi-
meter after complete drying.
A resistance between 5and 10 KOhm will guarantee a safe
monitoring by the occupied track detection of the feedback
modules RS-8.
Customary used resistance axles with a resistance value of
18k Ohm will just be monitored, provided that the rails are very
clean and the railway coaches have a sufficient contact to the
rails. In such case it will be recommended, to fit two resistance
axles to the coach to receive a total resistance value of about
9k Ohm. This will assure a save monitoring even when the rails
are not perfect clean.
Trouble shooting:
What to do if something is not working as described above?
If you have purchased the RS-8 as a kit, please carefully check
all parts and all soldered joints.
Important for a correct feedback report is: It is absolutely
required that both inputs (IN1 and IN2) will receive the supply of
digital current.
Please test the detecting function of the modules first before
connecting it to the tracks.
To do this you can use a resistor (several of hundred Ohms) or a
model railway lamp which will simulate the occupied situation on
each clamp.
Without resistor or lamp the detection of the input should be
identified as “free”. With a resistor or lamp your digital control unit
or PC should show an “occupied” situation.
Made in Europe by
Littfinski DatenTechnik (LDT)
Bühler electronic GmbH
Ulmenstraße 43
15370 Fredersdorf / Germany
Phone: [phone] / 867-0
Internet: www.ldt-infocenter.com
Subject to technical changes and errors. 08/2022 by LDT
Lenz and Digital plus are registered trademarks.