View source for CV 21

{{Infobox CV
|cv name= Consist Light Control (F1-F8)
|cv range=0-255
|cv accepted=0-255
|cv default=0
}}

==NMRA CV 21 - Consist Lighting Control for Function 1 Through Function 8==
This CV is used to configure what functions will respond to user input on the consist address. This particular CV affects F1-F8. For each Bit which is set, that the function will respond to instructions addressed to the consist address ONLY. Each bit which is cleared indicates that the function will only respond to instructions addressed to the locomotive's individual address. F1 is controlled by bit 0; F8 by bit 7. 

To determine which functions are active, use the table below and combine the values of the functions you would like to have active, and program the ''sum'' into CV 21. By default, all functions are active on the consist address. 

'''NOTE:''' WOWSound decoders prior to Version 5 and all non-sound decoders will always have all functions available on the Base Address. This CV, as well as [[CV 22]] can be used only to deny the use of a function while in a consist when the consist address is selected. 

{| class="wikitable" style="text-align: center;"
|-
!Bit
! scope="col" |Feature
! scope="col" |Value
!Default
|-
!0
! scope="row" |Function 1
|1
|Control on Consist Addr
|-
|-
!1
! scope="row" |Function 2
|2
|Control on Consist Addr
|-
|-
!2
! scope="row" |Function 3
|4
|Control on Consist Addr
|-
|-
!3
! scope="row" |Function 4
|8
|Control on Consist Addr
|-
|-
!4
! scope="row" |Function 5
|16
|Control on Consist Addr
|-
|-
!5
! scope="row" |Function 6
|32
|Control on Consist Addr
|-
|-
!6
! scope="row" |Function 7
|64
|Control on Consist Addr
|-
|-
!7
! scope="row" |Function 8
|128
|Control on Consist Addr
|-
|}

''' Related: '''

*[[{{NAMESPACE}}:CV_19|Consist Address]]
*[[{{NAMESPACE}}:CV_22|Consist Lighting (Part 2)]]
*[[{{NAMESPACE}}:CV_23|Consist Acceleration Adjustment]]
*[[{{NAMESPACE}}:CV_24|Consist Deceleration Adjustment]]
*[[{{NAMESPACE}}:CV_156|Dual Prime Mover Delay]]

[[Category:Standard CV]]
[[Category:Bitwise CV]]