NMRA Standard CV's

Overview

This page lists the numbers and names for all of the Configuration Variables defined by the NMRA Standards, including manufacturer-unique ones, used in TCS decoders.

NOTE: This page refers only to TCS Non-sound decoders Version 88 to [current Version], as well as all WOWSound decoders Version 4.x.

You can read the NMRA Standards for Configuration Variables (CV's) (Document No. S-9.2.2) for yourself on the NMRA website: NMRA Standards and Recommended Practices

NOTE: Not all CV's listed on this page are supported by TCS, and not all supported CV's are universally supported by all products. For example, RailCom® configurations, lighting output assignment, and other features which require hardware support may not be applicable to your decoder. Pay special attention to the CV Addendums for your specific decoder. If you are unsure what your decoder is, you can read CV 249 the Decoder Hardware Model Identifier. If you are unsure if your decoder supports a feature, visit the specific product page for your decoder on TCS' Website for a full list of features.

List of Standard CV's

CV	Description
CV 1	Short Address (2-Digit Address)
CV 2	Start Volts (Vstart / "Boost")
CV 3	Acceleration Rate
CV 4	Deceleration Rate
CV 5	Top Volts (Vhigh / Limit)
CV 6	Mid Volts (Vmid)
CV 7	Manufacturer Version Number
CV 8	Manufacturer ID
CV 9	[Not Supported] Total PWM Period
CV 10	BEMF Cutout
CV 11	Packet Time
CV 12	Power Source Conversion
CV 13	DC Mode Function Status F1-F8
CV 14	DC Mode Function Status F0 & F9-F12
CV 15	Decoder Lock (Key)
CV 16	Decoder Lock (Lock)
CV 17	Extended "Long" Address (High Byte)
CV 18	Extended "Long" Address (Low Byte)
CV 19	Consist Address
CV 20	(Reserved by NMRA)
CV 21	Consist Function Control (F1-F8)
CV 22	Consist Function Control (F0 & F9-F12)
CV 23	Consist Acceleration Adjustment
CV 24	Consist Deceleration Adjustment
CV 25	Speed Table Selection
CV 26	(Reserved by NMRA)
CV 27	Decoder Automatic Stopping Configuration
CV 28	RailCom Configuration
CV 29	Configuration Data #1
CV 30	Error Information
CV 31	Indexed CV High Byte
CV 32	Indexed CV Low Byte
CV 33	F0F Remapping (0-6)
CV 34	F0R Remapping (0-6)
CV 35	F1 Remapping (0-6)
CV 36	F2 Remapping (0-6)
CV 37	F1 Remapping (7-12)
CV 38	F2 Remapping (7-12)
CV 39	F3 Remapping (0-6)
CV 40	F4 Remapping (0-6)
CV 41	F3 Remapping (7-12)
CV 42	F4 Remapping (7-12)
CV 43	F5 Remapping (0-6)
CV 44	F6 Remapping (0-6)
CV 45	F5 Remapping (7-12)
CV 46	F6 Remapping (7-12)
CV 47	[Not Used]
CV 48	[Not Used]
CV 49	F0F Lighting Effect
CV 50	F0R Lighting Effect
CV 51	F1 Lighting Effect
CV 52	F2 Lighting Effect
CV 53	F3 Lighting Effect
CV 54	F4 Lighting Effect
CV 55	F5 Lighting Effect
CV 56	Dither Frequency
CV 57	Dither Amplitude
CV 58	F6 Lighting Effect
CV 59	[Not Used]
CV 60	[Not Used]
CV 61	Configuration Data #2
CV 62	[Not Used]
CV 63	Ditch Light Blink Holdover Time
CV 64	"Constant Dim #1" Brightness Level
CV 65	[Not Used]
CV 66	Forward Trim
CV 67	Speed Table Step 1
CV 68	Speed Table Step 2
CV 69	Speed Table Step 3
CV 70	Speed Table Step 4
CV 71	Speed Table Step 5
CV 72	Speed Table Step 6
CV 73	Speed Table Step 7
CV 74	Speed Table Step 8
CV 75	Speed Table Step 9
CV 76	Speed Table Step 10
CV 77	Speed Table Step 11
CV 78	Speed Table Step 12
CV 79	Speed Table Step 13
CV 80	Speed Table Step 14
CV 81	Speed Table Step 15
CV 82	Speed Table Step 16
CV 83	Speed Table Step 17
CV 84	Speed Table Step 18
CV 85	Speed Table Step 19
CV 86	Speed Table Step 20
CV 87	Speed Table Step 21
CV 88	Speed Table Step 22
CV 89	Speed Table Step 23
CV 90	Speed Table Step 24
CV 91	Speed Table Step 25
CV 92	Speed Table Step 26
CV 93	Speed Table Step 27
CV 94	Speed Table Step 28
CV 95	Reverse Trim
CV96 -104	(Reserved by NMRA)
CV 105	User Identification #1
CV 106	User Identification #2
CV107 -111	(Reserved by NMRA)
CV 112	Mars/Gyra "Low" Brightness Level
CV 113	Mars/Gyra Max Brightness Duration
CV 114	Mars/Gyra Full Cycle Duration
CV 115	Mars/Gyra "Mid" Brightness Level
CV 116	Mars/Gyra "Maximum" Brightness Level
CV 117	Blinking Ditch Light Alternation Rate
CV 118	Rotary Beacon "Minimum" Brightness
CV 119	Rotary Beacon "Max" Brightness Duration
CV 120	Rotary Beacon Full Cycle Duration
CV 121	Rotary Beacon "Mid" Brightness Level
CV 122	Rotary Beacon "Maximum" Brightness
CV 123	Manual Rule17 Dimming Button Remapping (0-6)
CV 124	Flashing Ditch Light Button Remapping (0-6)
CV 125	Variable Momentum Decel. Rate #2 End Speed
CV 126	Variable Momentum Deceleration Rate #2
CV 127	Variable Momentum Decel. Rate #3 End Speed
CV 128	Variable Momentum Deceleration Rate #3
CV 129	Variable Momentum Accel. Rate #2 Start Speed
CV 130	Variable Momentum Acceleration Rate #2
CV 131	Variable Momentum Accel. Rate #3 Start Speed
CV 132	Variable Momentum Acceleration Rate #3
CV 133 & 134	[Not Used]
CV 135	"Random Flicker #1" Flicker Speed
CV 136 & 137	[Not Used]
CV 138	Brake Lights On Time
CV 139	Brake Button Remapping (0-6)
CV 140 & 141	"Single Pulse Strobe #1" Configuration
CV 142 & 143	"Single Pulse Strobe #2" Configuration
CV 144 & 145	"Flashing Light" Configuration
CV 146 - 151	"Double Pulse Strobe" Configuration
CV 152	"Random Flicker #2" Flicker Speed
CV 153	"Constant Dim #2" Brightness Level
CV 154	"Constant Dim #3" Brightness Level
CV 155	"Constant Dim #4" Brightness Level
CV 156	Forward Headlight Dimness
CV 157	Reverse Headlight Dimness
CV 158 - 176	[Not Used]
CV 177	BEMF Algorithm Responsiveness
CV 178	BEMF Algorithm "High Speed" Sample Rate
CV 179	BEMF Algorithm "Low Speed" Sample Rate
CV 180	[Not Used]
CV 181	BEMF Algorithm "Critical Speed Step"
CV 182	Configuration Data #3
CV 183	Brake Deceleration Rate
CV 184	Brake Deceleration Rate #2 (WOWSound)
CV 185	Brake Deceleration Rate #3 (WOWSound)
CV 186	Brake Deceleration Rate #4 (WOWSound)
CV 187	Brake Deceleration Rate #5 (WOWSound)
CV 188	[Not Used]
CV 189	[WOWDiesel] Dynamic Brakes Min Speed
CV 190	[WOWDiesel] Dynamic Brakes Decel. Rate
CV 191	[WOWDiesel] Dynamic Brakes Speed Decrease
CV 192 - 247	[Not Used]
CV 248	[WOWSound] Sound Set Version Number*
CV 249	Decoder Hardware Model Identifier
CV 250	Month of Manufacture
CV 251	Day of Manufacture
CV 252	Year of Manufacture
CV 257 - 512	NMRA Indexed CV Working Area
CV 513 - 891	(Reserved by NMRA)
CV 892	[Not Supported] Decoder Load
CV 893	[Not Supported] Dynamic Flags
CV 894	[Not Supported] Fuel/Coal Level
CV 895	[Not Supported] Water Level
CV 896 - 1024	[Not Supported] SUSI Sound & Function Modules

See Also

Looking to filter down this list into a particular category? Follow the links below to see CV's within specific categories

• List of Indexed CV's
• Addressing CV's
• Bitwise CV's
• DC Mode CV's
• Lighting CV's
• Motor Control Related CV's
• Read-Only CV's
• Unsupported CV's