There is a signal phase present on the rails, where one rail is energized (HIGH/ON) while the other is LOW/OFF.Voltage (amplitude) does not determine locomotive speed.There is full power on the rails at all times while the booster output is turned on.Rise times and the amplitude of the signal carry no information.
The data is encoded in the time domain.The data value is determined by the period from one HIGH state to the next: 106µs (58 + 58) has a value of One, 200µS is a Zero.The pulse widths are asymmetrical the amplitude is symmetrical.The booster supplies a binary ON (HIGH) / OFF (LOW) signal which is applied to the power bus, which is carried to the track, then the train.Many misunderstandings and myths are a result of attempts to fit DCC into an Analog / Direct Current framework. To truly understand it, do not attempt to apply analog (DC) concepts to Digital Command Control. Another source of confusion is the application of incorrect terminology. Others have been promoted over the years due to misunderstandings or dislike for the DCC technology.
Some come from a literal interpretation of the NMRA DCC Standards. Most of those myths are the result of applying analog ideas to a digital concept. There are many myths surrounding the DCC signal. The nature of a square wave results in more demanding requirements for wiring to avoid voltage losses and signal distortion compared to analog control methods. Since the signal is completely digital, the NMRA Digital Command Control waveform is a square wave. Since the rails are alternately energized or held to zero, there are no issues with polarity. It is not superimposed on a DC or AC waveform, nor does it use a high frequency carrier, unlike past and current command control systems. The digital information is encoded in the time domain by pulse width, not amplitude. NMRA Digital Command Control, unlike other analog and digital Command Control systems, puts a 100% digital signal onto the rails, delivering both power and data in the same signal. If you don't understand everything, don't worry. You don't need to fully understand the technical details of how DCC works to use DCC on your railroad. Close Overview of NMRA Digital Command Control – Power
0 kommentar(er)
