LDT-Decoder using on TWIN-CENTER!

The TWIN-CENTER transmits the Fleischmann owned FMZ-Format as well as the standardized DCC-Format to the Lok- or accessory-decoder. This enables the control unit to respond to the LDT-Decoders for the DCC-Format ( S-DEC-4-DC, SA-DEC-4-DC, M-DEC-DC and LS-DEC).

The TWIN-CENTER provides the s88-feedback bus for the feedback of events from the tracks. The LDT-Feedback Modules RM-DEC-88 und RM-DEC-88-Opto (both for quick action switches) and RM-GB-8 (for track occupancy reports) as well as the Data-Switch DSW-88 can communicate with the TWIN-CENTER without any problems.

At the data file twin-center_info_engl.zip (Size: 287KB) you will find recommandations and sample connections for the TWIN-Center in communication with LDT-Components.

Recommandations for the installation of LDT-Decoder on  TWIN-CENTER:

1. Registration of DCC Decoder on TWIN-CENTER

As per factory adjustment the TWIN-CENTER transmit FMZ-data to the decoder. To operate the LDT-Decoder the respective addresses have to be changed to DCC.

This operation is described within the TWIN-CENTER operating manual at paragraph 8.1 turnout/signals registered at the TWIN-CENTER on page 39.

Four statements have to be adjusted for each address:

1.  The so-called Virtual Address (from 1 to 2048). This complies e.g. to the number of a turnout.

2.  The Decoder Address or the decoder number. There are values of 1 up to 512 adjustable.

3.  At the decoder output values between 1 to 4 can be adjusted (as all LDT-Decoder contain four outputs).

4.  The Data Format. It has to be set to D for DCC, if the LDT-Decoder shall take over the switch events.

As the required adjustments at the TWIN-CENTER will cause probably at first some problems, we have created a table for your assistance including all details for the first 512 virtual addresses. Please load the file TWIN-CENTER_Adressierungstabelle1.zip (size: 29KB) to your PC.

2. Programming the decoder address

During the operation at the TWIN-CENTER it can happen that after actuating the programming key the decoder will switch the turnout at output 1 immediately into a fast sequence such as it would confirm the programming of an address. In this case the address repetition storage of the TWIN-CENTER contains by error data on which the decoder is already reacting.

Proceed now as follows:

1. Programming the decoder immediately after switching-on the digital central unit, before any loc is travelling.

2. Proceed with a RESET of the digital central unit. All stored data will be preserved, only the address repetition storage will be deleted. On the TWIN-CENTER you have to activate at switched-on status the keys GO and STOP together until “reset” will be shown at the display.

3. Adjusting the switching times

The TWIN-CENTER output is not a clear DCC-data format but a mixture of FMZ and DCC format.

LDT-Decoder are optimal tuned to this data format. But will the decoder not switch always reliable it is possible to adapt the TWIN-CENTER to the requirement.

At the paragraph 8.5 Adjustment of switching time (page 42 of the TWIN-CENTER Operating Manual) this procedure is explained in detail. The factory adjustment has been set for the minimal and maximal switching time of 50ms.

Subject to technical changes and errors.

© 2007 by LDT