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Hornby 'Select' and Hornby 'Elite' digital units supply the DCC signal to the rails at all times. The DCC signal provides both power and information to locomotives and accessories that are on or connected to the track. Each locomotive that is DCC controlled must have a small micro processor - or decoder - fitted internally. This decoder is capable of ‘listening’ for information or messages are unique to the loco.
This unique ’addressing’ of a decoder enables several locomotives to be moved individually on the track and at the same time, without the need for complex wiring and isolating sections! The decoder may also be able to operate lights, fans, and other locomotive features, and will also keep the loco running at a set speed no matter what gradients or loads the model encounters.
The Hornby digital system can also operate points and electrical accessories, in a similar way to controlling a locomotive. A special decoder can be fitted to a section of track close to a chosen point, signal or accessory (or up to four points) and by ‘addressing’ the decoder, the item can be changed through the DCC controller.
The Hornby 'Select' and Hornby 'Elite' digital units when connected to the track pass not only a constant 15v AC along the rails, but also information signals to all locomotives that are on or are connected to the track. Each locomotive that is DCC controlled must have fitted internally a small micro processor based receiver called a Decoder. This Decoder is capable of "listening" for information or messages which refer to the locomotive that the decoder is fitted to.
Using the keypad that is on both the 'Select' and 'Elite' Units locomotives can be "called up" individually and operated just like the real thing. Imagine a busy marshalling yard where the locomotives are positioned close together and where by using either of the Hornby Digital Controllers, Hornby digital locomotives can be manoeuvered from one place to another without having to worry about the complexities of having to connect metres of wiring to a bank of switches and isolating sections and hoping the whole thing will work!