MXDS Turntable Module

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1997 01 01
1997 01 15
1997 02 19 only German
2003 04 15 English translation by Tony Pemberton
Instruction Manual
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1. Introduction
The MXDS is principally designed to operate ROCO turntables, but will operate
other vendor’s turntables if they have bridge/track position contacts.
The MXDS controls turntables from ZIMO MX2 handheld controllers or from a
For computer use, an application running under Windows™ software is available
(MXDS/SW supplied by: E. Sperrer). This uses the MXDS RS232 Interface.
Alternatively, turntable control is built in to STP Version 4.1 or later (Dispatcher
panel software also supplied by E. Sperrer). In this case, communication uses the
CAN bus.
2. Using the ROCO turntable
?? On the lower surface of the turntable is a switch; this must be set to position
"0". This will allow the track position connections to be acknowledged.
?? When the turntable bridge passes active tracks, it is possible that a connection
between two neighbouring rails of the opposite polarity may be briefly
connected. This presents the danger of a short circuit, which will need to be
reset. To prevent this, the turntable bridge rails must be controlled.
3. Using other turntables
The MXDS can only be used if feedback of the current bridge position through
contacts is possible.
Position recognition is achieved as follows. The MXDS has 32 pins in two 16-pole
IDC connectors that supply a 1 kHz tone. The pins are attached to each track
outlet position contacts (not the bridge). The turntable bridge position contact is
connected to pin 6 of the 8-pole edge connector of the MXDS, which is the position
sensor input.
When the turntable rotates, one of the turntable outlet track contacts will connect to
the bridge contact, creating a circuit and providing position feedback.
4. Calibration of the MXDS
After completing installation of the turntable, or after changing the track
configuration, and the wiring to the MXDS, a calibration procedure is necessary.
This started by pressing both keys on the module simultaneously.
(Subsequently these keys will be used to operate the turntable "manually" to move
the bridge a track to the left or right.)
The calibration procedure consists of a revolution of the turntable, where the
turntable module registers and records the position of individual track connections
in its EEPROM (a non volatile memory element). This information is used for the
optimisation of the rotation needed in operation.
Calibration procedures can also be performed through computer operation.
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Legends for diagram
Double connector for turntable bridge rails:
In a ZIMO environment, connect this to an output (“KS”) of an MX7 (or MX7/3)
polarity reversal module, where the input is connected to the power module.
Power supply for turntable motor and internal operation. Max. 15Volts AC only is
permitted, e.g. usual accessory outputs from model railway transformers.
CAN-Bus connectors
RS-232 Interface for computer operation only.
Buttons for manual operation of the turntable (either one step forward or back).
8-pole edge-connector for ROCO turntable.
CAUTION: Connector must be attached with numbered side upward.
Track connection to turntable bridge.
Turntable bridge contact to permit track supply (not used by ZIMO)
Output for position detent solenoid
Output for turntable motor
Input for turntable bridge position contact
Outputs to track outlet position contacts
By ribbon cable
CAN-bus activity LED (Green = receive, Red = send)
Middle LED – what is this??? Contact sensor indicator LED?
Operation indicator LED (Blinking green)
Tasten für manuelle
Betätigung der Drehscheibe (jeweils einen
Schritt vor oder zurück)..
Anschlußdoppelklemme für
Fahrspannung auf der Brücke:
Im ZIMO-Einsatz wird hier
der Ausgang ("KS") eines
Kehrschleifenmoduls M700
oder MX7 angeschlossen,
dessen Eingang am Basisgerät angeschlossen ist.
Versorgung für DrehscheibenMotor und internen Verbrauch;
nur Wechselstrom zulässig,
max. 15 V (z.B. Lichtausgang
eines üblichen Modellbahntrafos).
ACHTUNG: eigener Trafo nötig
(nicht Trafo, der andere Geräte
versorgt) !
für CAN-Bus,
intern parallelgeschaltet
zum Durchschleifen.
RS-232 Interface
wird alternativ zum
CAN-Bus verwendet
(für Computer-Betrieb,
nicht für MX2-Bedienung).)
für 8-poligen Stecker
der ROCO-Drehscheibe.
ACHTUNG: Stecker muß
mit numerierter Seite nach
oben aufgesteckt werden.
1, 8 - Gleisanschlüsse auf Brücke
2, 7 - Kontakte auf Brücke zur Versorgung der
Gleisanschlüsse (nicht im ZIMO-Betrieb)
4 - Ausgang für Drehstop-Magnet
5 - Ausgang für Drehscheiben-Motor
6 - Eingang vom Stellungskontakt auf der Brücke
Ausgänge zu den
der Gleisanschlüsse:.
Am Bandkabel:
2 4 6 8 10 12 14 16
1 3 5 7 9 11 13 15
18 20 22 24 26 28 30 32
17 19 21 23 25 27 29 31
5. Using an MX2 for turntable control
The Base address of the MXDS turntable module 980; this address corresponds
to the first 8 track connections. Each group of 8 further track connections can be
addressed using addresses 981, 982, 983.
The address is entered on the MX2 and activated with the "A" key.
All key LEDS (1 to 8) for existing track connections (as determined in the
calibration procedure) will be illuminated red, except where the turntable bridge is
connected to a track outlet in the group, in which case the key LED will be
illuminated green.
Pressing a key (1-8) will cause movement of the turntable bridge to the target
track outlet the shortest possible way. During the rotation, the key LEDs will
flash green for each sensed track outlet. When the target track is reached, the
flashing LED will change to continuous green.
? ouble pressing the key (within ½ second) will make the bridge turn the longer
way, i.e. the bridge is turned 180° or more.
Pressing the key corresponding to the current turntable bridge position,
causes the bridge to rotate 180°.
Pressing a key while rotation is in progress will cause interruption of the
current operation and restart toward the new target outlet track.
While the turntable is in operation (when a turntable address is active), the slider
control, direction key and MAN-button are available to control a locomotive.
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