Post by Hal GreenleeI suspect that the Digitraxx in question simply does not have DC capability.
There is no mention of DC or dual-mode as a feature on the data sheet.
Anybody know otherwise?
This quote comes from the DigiTrax Decoder Manual:
3.8.2 Digitrax 9 Pin HO Decoder Interface
Most Digitrax HO scale wired decoders come with a plug and socket on the
decoder so that the wires can be unplugged from the decoder. This interface
lets you share one or more decoders among multiple locomotives wired with
Digitrax 9 pin harnesses. DHWH is the wire harness with a plug that attaches
to your DH series decoders and 9 wires that are soldered to the motor,
brushes and functions on your locomotive. DHDP is a DC dummy plug available
for DC operation of harnessed locomotives (without decoders). When you
install a DHWH wire harness in your locomotive and plug a DHDP dummy plug
into it, your loco will operate on any analog control system. When you
remove the DHDP and plug in a decoder, the loco will run on DCC. The
Digitrax 9 pin interface gives you a cost effective way for clubs and large
layouts to share the decoders they have and run with Digitrax even if all
locos can't be converted right away.
Also, CV13 is DC Functions On default 0. I take it a 1 would turn this on.
Note that the manual says that this is not available in FX3 decoders.
Again from the manual: The analog mode conversion feature is very convenient
if you plan to run your Digitrax decoded locomotive on regular DC layouts.
With analog mode conversion enabled, the decoder will automatically begin
operating as a DC locomotive when no DCC signal is detected by the decoder.
This means that if you place your Digitrax decoder equipped loco, with
analog mode conversion enabled, on a regular DC layout, it will run on the
DC layout.
This is covered under CV29 and all DigiTrax decoders default to 6, which has
Analog Mode Conversion set to ON.
Hope this helps!
Frank Eva
http://www.digitalrailroader.org