Marklins M83, M84 and signals MAY have their register values (sic CVs) up to #80 programmed using MM protocol,
However using the DCC protocol is the only way to address CVs above this false MM limit.
(Yes I know there are a few exceptions .... :-( )
What needs to be understood is that once configured, the values are retained if you switch the m83/m84 (or signals) back to MM mode.
Originally Posted by: Minok 
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Key points:
1) You need to switch the thing you want to program into DCC mode (out of MM mode) so that it will respond as a DCC device.
a) The device needs to be set to DCC mode in order to communicate with a DCC controller - DIP switch 10 on
b) While the Mobile Station may concurrently control locomotives in MM,FX,DCC,MFX on a per address basis, the implementation for Accessories is ALL MM or ALL DCC. In order to program in DCC the Accessory (Magnet/Signal) protocol should be set to DCC.
Please note, with a Mobile Station programming is done to the whole layout, there is no separate programming track. For this reason I suggest returning devices to MM mode after configuration, otherwise devices already installed will end up with their configuration corrupted.
This is why you see the final steps to return the device (DIP sw 10) and the Mobile Station protocol back to MM
Originally Posted by: Minok 
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2) You need to then "ADD" that device to your MS2, as a new Locomotive - because the MS2 only has the concept of "Locomotive" as a new device. Set it up as a DCC device, with the DCC address you gave it... so you need to set the DIP switches on the device to set the mode to DCC and the DCC address I
IF you already have a DCC locomotive defined, you may use that as a proxy reference.
The address is not important as the programming method used (non PoM and non MM REG mode) just broadcasts to anyone listening
As above, because there is no Programming track with the Mobile Station all devices will get the configuration commands.
Ensure you have no locos on the track - better still disconnect the mobile station (Track Box) from the layout
Even if you have set your other accessories to MM, their power draw will adversely affect the read back if not the writing to a new device being targeted.
Originally Posted by: Minok 
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3) Then you can program the CVs (with a MS2, I believe you can NOT read out CV values, you can only set them)
Incorrect in the context of DCC without PoM
I would highly recommend that the m83 is powered (with a 6636*), otherwise you may get a corrupt value read back (usually looses bit 0 )