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NMRA Standard CV Definitions for Mobile Decoders

Posted on by TRAINS4AFRICA

This Document forms part of the “DCC for the Engineer” series, and lists the complete NMRA Standard Configuration Values (ref: S-9.2.2)

You can reference the “DCC Decoder Data” Article for general information.

 

Multi-function Decoder Configuration Variables
CV Name
CV #
Required
Default Value
Read Only
Uniform Spec
Dynamic (Volatile)
Comments
Multi-function Decoders:
Primary Address
1
M
3
Y
Vstart
2
R
Acceleration Rate
3
R
Deceleration Rate
4
R
Vhigh
5
O
Vmid
6
O
Manufacturer Version No.
7
M
Y
 Manufacturer defined version info
Manufacturer ID
8
M
Y
Y
 Values assigned by NMRA
Total PWM Period
9
O
EMF Feedback Cutout
10
O
Packet Time-Out Value
11
R
Power Source Conversion
12
O
Y
 Values assigned by NMRA
Alternate Mode Function Status F1-F8
13
O
Y
Alternate Mode Function Status FL, F9-F12
14
O
Y
Decoder Lock
15 – 16
O
Y
Extended Address
17 + 18
O
Y
Consist Address
19
O
Y
20
Y
 Reserved by NMRA for future use
Consist Addr Active for F1-F8
21
O
Y
Consist Addr Active for FL-F9-F12
22
O
Y
Acceleration Adjustment
23
O
Y
Deceleration Adjustment
24
O
Speed Table/Mid-range Cab Speed Step
25
O
Y
26
O
 Reserved by NMRA for future use
Decoder Automatic Stopping Configuration
27
O
Y
 Under re-evaluation – see details
Bi-Directional Communication Configuration
28
O
Y
 Under re-evaluation – see details
Configuration Data #1
29
M
Y
 SEE NOTE 1
Error Information
30
O
Y
Index High Byte
31
O
Y
 Primary index for CV257-51200000000 – 00001111 reserved by NMRA for future use.
Index Low Byte
32
O
Y
 Secondary index for CV257-512
Output Loc. FL(f), FL(r), F1-F12
33-46
Manufacturer Unique
47-64
O
 Reserved for manufacturer use
Kick Start
65
O
Forward Trim
66
O
Speed Table
67-94
O
Reverse Trim
95
O
96-104
 Reserved by NMRA for future use
User Identifier #1
105
O
 Reserved for customer use
User Identifier #2
106
O
 Reserved for customer use
107-111
 Reserved by NMRA for future use, CV107,108: expanded Mfg. ID,CV109-111: expanded CV7
Manufacturer Unique
112-256
 Reserved for manufacturer use
Indexed area
257-512
 Indexed area – see CV# 31,32, Index values of 0-4095 reserved by NMRA
513-879
 Reserved by NMRA for future use
880-891
–
Y
 Reserved by NMRA for future use
Decoder Load
892
O
Y
Y
Dynamic Flags
893
O
Y
Y
Fuel/Coal
894
O
Y
Y
Water
895
O
Y
Y
SUSI Sound and Function Modules
896-1024
O
Y
 See TN-9.2.3

 

Notes:

  • If any of these features are provided, then this CV is Mandatory
  • Not All Digital Decoders don’t implement all the CVs, but if the function is provided the relevant CV information must be adhered to.

 

Definitions

  • Mandatory (M)
    CVs identified at Mandatory must be present to conform to the standard

 

  • Recommended (R)
    Those marked Recommended the NMRA strongly encourages their implementation

 

  • Optional (O)
    Optional CVs can be included if the manufacturer wishes.

 

  • Read Only
    Indicates a CV that is set and cannot be altered.

 

  • Uniform Specification
    CVs are specific to the implementation and no uniform specification is needed. Others must be implemented in a uniform manner to maintain compatibility. If marked Yes, the CV must be implemented according to a common specification. If there is no Y in the column, the CV must be used for its designated purpose, but the actions taken by the decoder for a certain CV value can vary among decoder makers.

 

  • Dynamic
    These CVs are used for Unsolicited Decoder Initiated Transmission.
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