Locomotive Interface/NMRA Connector Wiring
DCCWiki, a community DCC encyclopedia.
| PIN ASSIGNMENTS BY COLOUR | |||
|---|---|---|---|
| DCCWiki.com | |||
| These Connector Types are now Obsolete. | |||
| Pin # | Small, Six Pin | Medium, Eight Pin | Large, Four Pin |
| 1 | Orange | Orange | Grey |
| 2 | Grey | Yellow | Orange |
| 3 | Red | Output 3 / Aux 1[1] | Black |
| 4 | Black | Black | Red |
| 5 | White | Grey | N/A |
| 6 | Yellow | White | |
| 7 | N/A | Blue | |
| 8 | Red | ||
Six and Eight Pin Interface
| Six Pin Socket Interface | ||
|---|---|---|
| Reference | S-9.1.1.1 | |
| DCCWiki.com | ||
| Pin | Description | Colour |
| 1 | Motor (+) | Orange |
| 2 | Motor (–) | Gray |
| 3 | Right Rail | Red |
| 4 | Left Rail | Black |
| 5 | Headlight, Front | White |
| 6 | Headlight, Rear | Yellow |
| Eight Pin Socket Interface | ||
|---|---|---|
| Reference | S-9.1.1.1 | |
| DCCWiki.com | ||
| Pin | Description | Colour |
| 1 | Motor (+) | Orange |
| 2 | Headlight, Rear | Yellow |
| 3 | Output 3 / Aux 1[1] | Green |
| 4 | Left Rail | Black |
| 5 | Motor (–) | Gray |
| 6 | Headlight, Front | White |
| 7 | Common (V+) | Blue |
| 8 | Right Rail | Red |
NMRA S-9.1.1 Decoder Interfaces
| Wire Colour | Function | Notes |
|---|---|---|
| Red | Right-hand rail power pick-up: Center rail, outside third rail, traction/overhead wire to motor or interface | 1 |
| Orange | Interface to Motor + (Postive) | |
| Black | Left hand rail power pickup to motor or interface | |
| Grey | Interface to Motor – (Negative) | 2 |
| White | Output #1 to Front Headlight | |
| Yellow | Output #2 to Rear Headlight | |
| Brown or Violet |
Speaker Connections | 3 |
| Green | Output #3 / Auxiliary 1 | |
| Brown or Violet |
Output #4 / Auxiliary 2 | |
| Output #5 / Auxiliary 3 | 4 | |
| Output #6 / Auxiliary 4 | ||
| Output #7 / Auxiliary 5 | ||
| Output #8 / Auxiliary 6 | ||
| Blue | Function Common (Anode Connection, Positive) for headlights and outputs | |
| Black w/ White Stripe |
Decoder negative rail (Common ground), sink. | |
| Notes | ||
| 1 | Connection to RH, center, third Rail or overhead traction wires | |
| 2 | Connection to LH rail | |
| 3 | Either colour could have been used prior to this definition. Either colour can be used but it must be documented. | |
| 4 | Any colour other than those defined may be used, but must be identifiable and documented. | |
Reference:
- ↑ 1.0 1.1 This connection on the socket (in the locomotive) may be left unconnected, or may be connected to an an accessory. If connected to an accessory, the accessory must be protected by a diode, if it is polarity sensitive, to avoid any damage in case the plug is inserted the wrong way into the socket. On the plug, this connection may be left unconnected or may be connected to connection 7 or may be connected to a decoder’s function output. In all cases, the use of this connection must be documented by the manufacturer.