digitrax dz125in help

QUOTE (harkins77 @ 7 Jul 2008, 03:47) <{POST_SNAPBACK}>Hi guys I was just wondering I have one of the dapol drs 66's and I was wondering if it is possible to be able to turn off the rear lights by just a press of a button for when I couple upto a rake of wagons so the loco looks right with it's rear lights being off.

I am using the digitrax dz125in decoder in one of the locos and also an old lenz 6 pin decoder but I cannot remember the model number.

The digitrax one is 2 function I know and can't remember what the lenz one is.

Any chance anyone knows if It can be done and if so how using a nce powercab controller please.

Regards

Kain.

*** It depends on the configuration of the lights. If you have auto reversing front and rear lights both ends, then front one end is coupled to rear the other and vice versa. In that case you cannot do what you wish without totally changing the lighting wiring as the lights will need to be on separate functions.

Neither of the decoders U have will do it - For full manual control as you want you will need a 4 Fn decoder:

One end white light to white Fn wire, other end white to yellow Fn wire - CV set to directional. Fn left on Fn 0 / light Fn as per default

one end red lights to green fn wire, ther end red to purple fn wire. CV for each set to directional and CV set to assign these wires to your preferred function.

CV51 = green, CV52 = purple for how the lights should act. You set to directional.

They are by default usually Fn 1 for green and Fn 2 for purple but if U need to change then the Decoder instructions will tell you which CV to use to set Function assignments for each wire.

Digitrax decoder manual makes it hard I'm afraid,,, personally I'd never use anything but a TCS M4 in this install - dead easy to programme with clear instructions and superb running.

Richard
DCCconcepts

QUOTE (Richard Johnson @ 7 Jul 2008, 04:43) <{POST_SNAPBACK}>*** It depends on the configuration of the lights. If you have auto reversing front and rear lights both ends, then front one end is coupled to rear the other and vice versa. In that case you cannot do what you wish without totally changing the lighting wiring as the lights will need to be on separate functions.

Neither of the decoders U have will do it - For full manual control as you want you will need a 4 Fn decoder:

The standard wiring of both UK 66's (Dapol and Farish) is to have headlamps/tail-lamps co-wired. Thus, headlamp at one end means tail at the other is on. This seems the norm for UK N diesels. They are also wired with diodes, so that the lamps work directionally when the analogue blanking plug is fitted.

There are two ways round this:
1) Full 4-function wiring as Richard outlined.
2) Staying with 2-function, and loosing one set of lights at each end. Then wire the remaining two lights to the two-function decoder. Still need to split the wiring if wanting tail lamps independent of headlamps.

You could do 4-function and keep the 6-pin NEM socket for the motor with a Zimo MX620 decoder (and get super motor control). But, you will need to change the light wiring (splitting the head/tail lamps into four separate), and run the two extra wires onto the solder pads on the Zimo chip (not for the soldering shy !, though not difficult with clean hot iron ).

- Nigel