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Selectrix
Selectrix is a digital model train control system developed by German company Döhler & Haas for model railway manufacturer Trix in the early 1980s. Selectrix is based on a data communication protocol developed originally by Siemens for communication between mainframe computers.
Döhler & Haas offered their system to several model railway manufacturers in the 1980s. The only manufacturer interested in the system was Trix GmbH and this resulted in a licensing agreement between the two companies giving Trix exclusive marketing rights to the system. In 1999 the two companies mutually agreed to terminate their licensing agreement. Since then, Selectrix has become a widely recognized open standard and is supported by several equipment manufacturers in Europe. Selectrix is especially popular in smaller N and Z scale model railways. European Model Train Association, MOROP has covered Selectrix data protocols partially in their NEM standards.
==Selectrix bus==
Selectrix is based on the principle of using one single data bus for controlling everything in a model railway layout including rolling stock, accessories and also feedback from various system components. The data bus is bi-directional and synchronized. This makes it possible to integrate many types of automatic functions in a model railway without a separate control computer and software using only a Selectrix central unit. Because the data packets are being sent out and received within a fixed timeframe, the system speed and reaction times are not dependent of the number of decoders to control, like is the case with other systems, most notably NMRA-DCC. Selectrix is also very resistant against data communication errors between the central unit and decoders in locomotives or data bus.
抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』
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