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To explain bit manipulation,
we'll discuss CV29, the #1 Configuration Data CV. CV 29 is probably
the second most important Configuration
Variable (second only to the address CV), allowing you to set
up the loco for several different things. Following is a list of the
things CV29 controls. Each of these features are discussed on their
own pages. For more information about any one of these features, just
click on it.
1) Loco's Base
Direction Calculating the value to program into CV29 can be daunting if you don't understand how to set individual bits. That's what this page is about. Once you understand how to do it with this CV, you will be able to do it with any CV that controls multiple things, which is most prevalent in Throttle Up!'s SoundTraxx decoders. To complicate things, there are several way to calculate the value. Which is best for you to learn and use depends on your DCC system. Some systems program only in Decimal. Some program only in Hexadecimal (a different way of counting), such as the previous Empire Builder and Chief with the DT100 throttles. Some systems, such as the Empire Builder and Chief, with the DT300 or DT400 throttles, allow you to use Decimal or Hexadecimal. After you learn how to do it in Hexadecimal, I think you'll find that that's much easier to calculate and program for CVs that control multiple things - especially with some of Throttle Up!'s SoundTraxx sound decoders. Some systems, such as MRC Command 2000, do not allow you to program CV29 with a calculated value. It has specific things it will program and that's it - because the system isn't capable of handling other features anyway. Only more advanced systems that are capable of handling more features will allow the individual programming of this or any other CV. Decoders come from the factory with a base configuration that will allow you to run locos without having to think about CV29, or any other CV except for the base address. Generally, all you need to do to run more than one decoder at a time is to reprogram each decoder's address. But if you need to change the loco's base direction, or use any of the other features controlled by CV29, then you'll have to use it. To try to simplify this calculation, the information for it is on two separate pages - one for Decimal, one for Hexadecimal. Select the one you prefer. |
