Main Page | Report Page

 

  Hobby Forum Index » Models - Railroad » 8-pin vs 9-pin decoder harnesses...

Author Message
Mark Mathu...
Posted: Tue Aug 31, 2010 7:54 am
 
A question from someone who is not decoder-savvy:

Why do some HO locomotives come with 8-pin DCC harnesses (for example,
the Atlas SD35) versus some that come with a 9-pin harness (for
example, the Walthers RS-2)? What's the difference in operation of
the plug? How does that limit decoder choices?

Atlas SD35: http://www.atlasrr.com/HOLoco/hosd35c.htm
"... NMRA 8-pin plug for DCC ..."

Walthers RS-2: http://www.walthers.com/exec/productinfo/920-35127
"... factory-installed 9-pin DCC harness…"
 
Reinhard Peters...
Posted: Tue Aug 31, 2010 12:21 pm
 
Mark Mathu schrieb am 31.08.2010 19:54:
Quote:
A question from someone who is not decoder-savvy:

Why do some HO locomotives come with 8-pin DCC harnesses (for example,
the Atlas SD35) versus some that come with a 9-pin harness (for
example, the Walthers RS-2)? What's the difference in operation of
the plug? How does that limit decoder choices?

Atlas SD35: http://www.atlasrr.com/HOLoco/hosd35c.htm
"... NMRA 8-pin plug for DCC ..."

Walthers RS-2: http://www.walthers.com/exec/productinfo/920-35127
"... factory-installed 9-pin DCC harness…"

The 8-pin is more common in Europe while the 9-pin is widely used in the
US. In fact I would have serious problems to get a 9-pin decoder over
here in Germany (except an US decoder imported by a special US model
railroad store).
The 8-pin plug has often only 7 line connected. PA1 and PA2 (green and
brown) are often not or only green (PA1) is connected. The 9-pin plus is
fine to have all lines and usually has all lines connected.

--
Mit freundlichen Grüßen
Best regards
Reinhard Peters
 
Mark Mathu...
Posted: Thu Sep 02, 2010 5:18 pm
 
On Tue, 31 Aug 2010 20:21:01 +0200, Reinhard Peters
<reinhard at (no spam) rub-peters.de> wrote:

Quote:
The 8-pin plug has often only 7 line connected. PA1 and PA2 (green and
brown) are often not or only green (PA1) is connected. The 9-pin plus is
fine to have all lines and usually has all lines connected.

Can a person use an 8-pin decoder in a 9-pin socket? What are the
results?
 
Puckdropper...
Posted: Fri Sep 03, 2010 10:51 am
 
Mark Mathu <mark at (no spam) mathu.com> wrote in
news:c5c086hh8kjjsoooqduq7crrv1upfm6h75 at (no spam) 4ax.com:

Quote:
On Tue, 31 Aug 2010 20:21:01 +0200, Reinhard Peters
reinhard at (no spam) rub-peters.de> wrote:

The 8-pin plug has often only 7 line connected. PA1 and PA2 (green and
brown) are often not or only green (PA1) is connected. The 9-pin plus
is fine to have all lines and usually has all lines connected.

Can a person use an 8-pin decoder in a 9-pin socket? What are the
results?

The form factors are different, the 8-pin is 2 rows of 4 pins, while the
9-pin is 1 row of 9 (much smaller) pins. The difference is merely
physical, adapters are available to go from one to the other.

Pictures are available here:
http://www.litchfieldstation.com/DCC-University/SelectHarness.htm

Puckdropper
--
Never teach your apprentice everything you know.
 
Craig Zeni...
Posted: Mon Sep 06, 2010 7:05 pm
 
In article <c5c086hh8kjjsoooqduq7crrv1upfm6h75 at (no spam) 4ax.com>,
Mark Mathu <mark at (no spam) mathu.com> wrote:

Quote:
On Tue, 31 Aug 2010 20:21:01 +0200, Reinhard Peters
reinhard at (no spam) rub-peters.de> wrote:

The 8-pin plug has often only 7 line connected. PA1 and PA2 (green and
brown) are often not or only green (PA1) is connected. The 9-pin plus is
fine to have all lines and usually has all lines connected.

Can a person use an 8-pin decoder in a 9-pin socket? What are the
results?

Yes, with a 8 to 9 pin adapter harness. In fact I buy 'blank' eight pin
male plugs and solder up my own harness. I use a lot of Train Control
System T1 decoders which are 9 pin but they came with the female plug on
a hardwire harness to be soldered into the model. But I take the eight
pin blanks, color match the harness to the plug and solder it up. Voila
- 9 pin decoder on an eight pin harness. And of course you can buy
those harnesses premade from TCS and others.
 
 
Page 1 of 1    
All times are GMT - 5 Hours
The time now is Tue Sep 02, 2014 7:24 pm