MTH; is it can not re program the CV?

UnionPasific Aug 21, 2010

  1. UnionPasific

    UnionPasific TrainBoard Member

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    All's

    I have SD70ACe MTH, normally from standard manufacture, loco run smooth, i want to modify became 128 step speed instead of 28. I want the loco can run very slow and have momentum effect.
    But its not have effect to loco, so anybody can solve this problem?

    thank
     
  2. Mike Sheridan

    Mike Sheridan TrainBoard Member

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    It will probably help to get a relevant reply if you can tell us what DCC system you are using to operate/program it - Manufacturer and Model.
     
  3. UnionPasific

    UnionPasific TrainBoard Member

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    my DCC system using dynamis and SIPROGII, because dynamis can not read CV so i use SIPROGII to help read and program CV, but for MTH is still have difficult even i use Dynamis for write CV.

    Thank for advance help.
     
  4. BarstowRick

    BarstowRick TrainBoard Supporter

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    Welcome to TrainBoard.

    Mike is correct. No two decoders are exactly alike...for competitive reasons.

    On some you can go to CV 30 and enter the numerical value of 2 and it reverts back to the manufacturers pre-programed values. As Mike said, knowing what decoder we are talking about will help.

    MTH? Did you buy a MTH locomotive, decoder equipped? Mikes Train House...right? O scale?

    .
     
  5. SteamDonkey74

    SteamDonkey74 TrainBoard Supporter

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    Are you using the SPROGII with JMRI DecoderPro?
     
  6. UnionPasific

    UnionPasific TrainBoard Member

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    I'm sorry not complete the spec,here i got loco have manufactured from MTH with DCC PROTO 3.0 and the model is SD70ACe HO.
    MTH=MIKE TRAIN HOUSE

    I use dcc system with dynamis and program using SIPROGII, i want to make loco have 128 step speed and run very slow during acceleration, but it doesn't effect to loco.

    thank's for further helps.
     
  7. markwr

    markwr TrainBoard Member

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    MTH's website shows the SD70ACe as being DCC ready. If you bought it with a decoder installed it may have been installed by the retailer. The first thing you need to determine is the decoder manufacturer. Read CV 8 to get the id number then you can look up the id from the chart at this link http://www.nmra.org/standards/DCC/mfgnumbers.html

    Once you know the decoder manual you can go to that manufacturers website and get information on what CV's that manufacturer uses.

    Also, my understanding of speed steps is the difference between 28 and 128 speed steps isn't a CV set in the decoder. Bit one of CV 29 selects 14 speed steps or 28/128 speed steps. If you set set the decoder for 28/128 speed steps you then need to set the command station to send 128 speed steps to the locomotive. The decoder determines if the speed stepping is 28 or 128 by seeing which type of commands it's being sent. The command station manual should tell you how to set the locomotive for 128 speed steps.
     
  8. CSX Robert

    CSX Robert TrainBoard Member

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    That will be a function of your command station. The loco will automatically recognize 128 speed steps, but you have to tell the command station to send 128 speed step commands to the decoder.

    My understanding is that MTH locos use CV3 and 4 for acceleration and deceleration, but they use the values to represent the rate, not the momentum. This means smaller numbers give your slower changes, just the opposite of normal DCC decoders.
     
  9. CSX Robert

    CSX Robert TrainBoard Member

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    The SD70ACe's are available DCC ready or with DCS installed. The DCC ready ones are a very recent addition, having just started shipping, so I suspect what UnionPasific has is DCS. DCS will run on DCC but only has a few programmable CV's which do not follow NMRA practices.

    I forgot to mention before that when used with DCC, DCS is only programmable in OPS mode.
     
  10. Geep_fan

    Geep_fan TrainBoard Member

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    If I recalled correctly about the MTH units. they don't follow NMRA rules on DCC. they use their in house DCS system which has been modified to work on DCC.

    I had one for a short period. for it to program it must be on the mainline and be programmed on the main with the track power on. you have to really mess around though because the CV's don't always program right. I reprogrammed my SD70ACe about 4 times before the CV's finally went through and it ran under a new address.

    just as a bit of warning here. do not program ANY other unit on the mainline while the MTH unit is on the main. the MTH unit will from that point on occasionally respond to the address of the other unit you programmed on the main. never found a fix for this.

    hope this helps.
     
  11. SteamDonkey74

    SteamDonkey74 TrainBoard Supporter

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    To add to that, if you're programming anything on the main (cringe) you should remove all your other DCC locomotives or you run the risk of reprogramming all of them as well.
     
  12. UnionPasific

    UnionPasific TrainBoard Member

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    Gents...

    Thank's for all explanation answer, i ll try to fix it. and post the progress.
     

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