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Information Regarding the Bell, Horn, and Function Buttons

The behavior of the function / sound buttons on a cab are not ALWAYS defined by the DCC system but  can ALSO be defined by the decoder in the locomotive. To find out what button does what function, or triggers a certain sound on your locomotive, read the documentation that came with the loco, consult the company's website or contact them by phone.

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On an NCE Cab per the NMRA standard:

The Bell button is ALWAYS the Bell and cannot be remapped

The Horn button is ALWAYS the Horn and cannot be remapped.

The F1 and F2 buttons CAN be remapped.

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The Bell and F1 Buttons can perform the same functions or different functions depending on how the decoder in the loco is programmed or if you have remapped the F1 button to perform a different function.

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For the Bell button, factory default is a toggle for F1 / function 1.  The default is on / off with each button press. 

To access the Set Cab Params menu:

Press the Program / Escape key (PROG/ESC) 6 times until you see Set Cab Params Press enter 6 times until you see Assign Bell to Function.   

FYI-   Older Soundtraxx Steam decoders use Function #3 for the Bell. The steam decoders can have the bell “re-mapped” to Function #1 (Diesel decoders can not re-map the bell to Function #3).

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For NCE mobile decoders only, the corresponding CV information translates into:

CV33 F0F default value is 1 output 1 / white / pin 6
CV34 F0R default value is 2 output 2 / yellow / pin 2
CV35 F1 default value is 4 output 3 / green / pin 3
CV36 F2 default value is 8 output 4 / violet
CV37 F3 default value is 16 output 5 / brown or solder pad
CV38 F4 default value is 4 output 6

CV120 EFX for F0F output 1 / white / pin 6 default value is 1 directional active in Forward
CV121 EFX for F0R output 2 / yellow / pin 2 default value is 2 directional active in Reverse
CV122 EFX for F1 output 3 / green / pin 3 default value is 0 - standard on / off
CV123 EFX for F2 output 4 / violet default value is 0 - standard on / off
CV124 EFX for F3 output 5 / brown default value is 0 - standard on / off
CV125 EFX for F4 output 6 default value is 0 - standard on / off

 

The answer to your question is not directly related to the NCE system or the NCE cab. All of this is determined. What a loco decoder responds to and HOW it responds is decided by the programming in the decoder. This process as called Button Mapping. It uses CVs “configuration variables” to determine what happens when a loco decoder receives notification that a certain button is pressed. The NCE system does NOT DETERMINE what happens when a locomotive decoder does when it receives a “this button was pressed” notification.

 

Please refer to the documentation of the loco decoder.  This is example below is the button mapping details of an NCE DECODER. This is not part of the NCE standard so do not use these values on your decoder unless it is an NCE decoder. This is for an example ONLY.

 

In most cases multiple buttons can be mapped to perform the same function if you use the same CV value in both CVs for both buttons.

 

CV33 F0F              default value is 1              output 1 / white  / pin 6

CV34 F0R        default value is 2      output 2 / yellow / pin 2

CV35 F1         default value is 4      output 3 / green  / pin 3

CV36 F2                        default value is 8     output 4 / violet 

CV37 F3                        default value is 16   output 5 / brown   or solder pad

CV38 F4                        default value is 4      output 6

CV39 F5                                default value is 8              output 7

CV40 F6                                default value is 16            output 8

CV41 F7                                default value is 32            output 9

CV42 F8                                default value is 64            output 10

CV43 F9                                default value is 16            output 11

CV44 F10              default value is 32            output 12

CV45 F11              default value is 64            output 13

CV46 F12             default value is 128          output 14

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CV67-CV94   Uploadable speed table steps 1-28 (128 speed mode calculates intermediate steps)

CV95          Reverse trim, values 1-127 add to reverse speed, values 129-255 add to forward speed

CV116       Torque kick rate (default is 4)- number of 16ms periods in a row that motor is ‘kicked’ with voltage pulse

CV117       Torque kick strength - how much voltage is used to kick the motor at slow speeds. Reduces

                    to 0 as speed is increased.

CV118       Ditch light hold time (in ¼ second increments) after F2 goes off.

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CV120 EFX for F0F output 1 / white  / pin 6        default value is 1  directional active in Forward

CV121 EFX for F0R output 2 / yellow / pin 2        default value is 2  directional active in Reverse 

CV122 EFX for F1 output 3 / green / pin 3          default value is 0 - standard on / off  

CV123 EFX for F2 output 4 / violet                 default value is 0 - standard on / off   

CV124 EFX for F3 output 5 / brown                  default value is 0 - standard on / off  

CV125 EFX for F4 output 6                          default value is 0 - standard on / off  

CV126 EFX for F5                                   default value is 0 - standard on / off 

CV127 EFX for F6                                   default value is 0 - standard on / off 

 

 

 

 

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