I have a Tsunami decoder installed in my SD 70, what I want to do is program CV 198 Bit 3 to enable automatic Brake squeal. The default setting is 0= effect is disabled, I need to change the default setting to 1 = effect enabled. I am completely confused on how to do this. HELP!!!!!
Thanks
ripgp30
Rip,
First question: Which DCC system are you using?
Tom
https://tstage9.wixsite.com/nyc-modeling
Time...It marches on...without ever turning around to see if anyone is even keeping in step.
Hi Tom, I am using the NCE Power CAB
rip
If you haven't already, go to the Soundtraxx website and download their Tsunami Diesel User's Guide as a reference. I'm assuming you have since you came up with the specific CV and bit that needs changing.
Whenever you starting adjusting "bits", this usually requires you to change a "primary" CV and a "secondary" CV first then you add a value to the current CV value to change the bit. This is best done in programming mode on your programming track so that you can read/record the values as you change them.
Rip, it looks like according to pg. 52 of the Tsunami manual (under Miscellaneous Features) that you just add the value of "8" to the default value of CV198 to get your automatic brake squeal. With your locomotive on the programming track, press the PROG/ESC button to enter programming mode. Programming CVs will be outlined for you in your Power Cab manual. It's pretty straightforward.
Page 52, i thought this was supposed to be fun.
tstageWhenever you starting adjusting "bits", this usually requires you to change a "primary" CV and a "secondary" CV first then you add a value to the current CV value to change the bit.
You're confusing indexed CV's ("primary" CV and one or more associated "secondary" CV's) with a CV that uses a bitmask (add individual "option" values to get the total CV value).
For example, the often-adjusted (and commonly misunderstood) CV29 uses a bitmask, but it isn't an indexed CV.
But if you really want to make it easy, just use JMRI. No understanding of bitmasks or indexed CV's needed at all - Just select the options you want from plain-language screens, tell it to write your changes, and you're done!
It's like this. Each CV is one byte in the decoder memory, or 8 bits.
If you need to turn on and off 8 different things, you COULD have 8 CVs, each with a value of 0 or 1.
However, that's wasting 7 bits per CV,56 bits total, or 7 whole bytes - 7 CV's worth of data. While we now see out computers with multiple gigabytes of memory in them, the little microcontrollers used in decoders do not have the luxury of making giant inefficient programs just because memory is cheap. It makes a great deal of sense to make those functions map to an individual bit in a single CV. CV29 is the prime standard CV that exhibits this
--Randy
Modeling the Reading Railroad in the 1950's
Visit my web site at www.readingeastpenn.com for construction updates, DCC Info, and more.
rustycoupler Page 52, i thought this was supposed to be fun.
It is, rusty. It's really not as difficult as it may appear. You can keep DCC as simple or make it as complicated as you want. The beauty is that it works great either way.
Yea i know but to a newcomer it can seem overwelming, i still cant post pictures on here, the manufacturers have to realize that we are all not tech savy.
Rusty,
That's why the manuals for your specific DCC system and decoders are so handy. Things like advanced consisting and programming Mars lights can appear daunting at first. However, the manuals - in general - do a pretty respectable job of walking you through the process. (At least that's the case for my NCE Power Cab.)
The only way I've become "tech-savvy" about anything is from being persistent, willing to try things, and not being afraid of making mistakes. Asking good questions to the right people helps, too.
Again, you can enjoy DCC's simplicity right out of the box or you can discover it's intricacies to your heart's content and willingness to learn. The owner's manual is the single best resource for the latter.
Adding a value of 8 to any CV will always put Bit 3 = 1. The default value of CV198 being 0 (zero) programming a value of CV198=8 will achieve what your are looking for.
Jack W.