Lais decoder in dummy unit lighting issues

[jonhinds]

I’ve got a Dapol 142 with Lais Next 18 decoders in both units. After addressing them simultaneously on the programming track of my Powercab the motorised unit is fine. Lighting follows direction of travel.

 

However, the dummy unit does not respond to function 0 to turn on directional lighting, and instead both 1 and 2 manually toggle each direction light on and off regardless of the  lighting direction of the motor unit.

 

Any ideas?

[Nigelcliffe]

Second decoder needs its function map changing to do what you ask, this is a handful of CV changes.    Presumably Dapol's instructions for their 142 explains which lights are connected to which decoder outputs, and that's the basic information you require.  (Or if they didn't explain, chances are its Function Output 1 and Function Output 2).   

[jamesed]

Try cv33=9 and cv34=6 or maybe the other way around.  You can program both units at the same time with those settings.  Should then all work as you wish it to. 

Edited October 16, 2023 by jamesed

[jonhinds]

1 hour ago, Nigelcliffe said:

Second decoder needs its function map changing to do what you ask, this is a handful of CV changes.    Presumably Dapol's instructions for their 142 explains which lights are connected to which decoder outputs, and that's the basic information you require.  (Or if they didn't explain, chances are its Function Output 1 and Function Output 2).   

The instructions state: “The lighting of the front and rear cars are independently operated. To all the same address to be used the non powered cars lights are operated by aux1 (white) and aux 2 (red). The decoder in this car will need to be programmed to operate these functions directionally and map to the function key of your choice.”

 

1 hour ago, jamesed said:

Try cv33=9 and cv34=6 or maybe the other way around.  You can program both units at the same time with those settings.  Should then all work as you wish it to. 

 

 Tried that and doesn’t seem to work!

[jamesed]

You must have both cars on the track and program them at the same time.  If you try and program the non-motor car on its own it won't take the programming.

 

Start with a reset (cv8=4 for Lais).  Then program the address so that both units will have the same. Then program cv33=9 and cv34=6 as I said.   That should be all you need to do to get front and rear lights all on F0

[jonhinds]

Strangely that still hasn’t worked 😔

 

Edit - found the solution here: 

 

Edited October 17, 2023 by jonhinds