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Digitrax Sound CV List
Function Key Usage
| Function Key |
Description |
F0 |
Lights |
F1 |
Bell |
F2 |
Horn/Whistel [CV150 selects Horn/Whistle type] |
F3 |
Coupler crash [Autocoupler/brake set by CV151 max spd] |
F4 |
Air feature disable - F4 OFF enables pop-off, drier and starts compressor/airpump |
F5 |
Diesel = Dynamic brake Fans, Steam= Waterpump turbine |
F6 |
Diesel = Notch UP - Steam = Blowdown ; if CV155 is not 0 |
F7 |
Crossing Gate Airhorn or;
Diesel=Notch DOWN/Steam=Wheelslip, ;if CV155 is not 0 |
F8 |
Mute control, [F8 ON is muted.] |
F9 |
Brake squeal |
F10 |
Crossing gate Airhorn/Whistle sequence |
F11 |
Steam = Greaser |
F12 |
Steam = Safety Blowoff |
CV Definitions
| CV Number |
Description [decoder CV8=8 reset value in brackets] |
CV58 |
Master Volume, 0-15, 0 = max, (F8 used for Mute) [9] |
CV60 |
Scheme select CV, 0 = Steam, 1 = SD38-2 diesel [0] |
**** |
|
CV122 |
Product Type, 12 = Digitrax SFX sound decoder Read Only Value |
CV123 |
Hardware Version, 17 = SDH104K1 decoder Read Only Value |
**** |
|
CV132 |
Diesel Notch rate [127] |
CV133** |
Steam Chuff/CAM config, 128=>EXT cam, 1-127=>DRIVER dia in inches[63] (see footnote) |
CV134** |
Steam gear ratio trim, 32 = 100% ratio, [32] |
CV135 |
Volume when Muted 0-64 [0] |
User Configurable SoundCV's |
CV140 |
PRIME mover Diesel/chuff vol 0-64 [60] |
CV141 |
BELL vol 0-64 [25] |
CV142 |
WHISTLE/HORN vol 0-64 [60] |
CV143 |
Air features vol (popoff, drier, comp) 0-64 [30] |
**** |
|
CV145 |
Misc vols 0-64 [40] |
CV146 |
BELL delay (24mS counts) 1-100 [7] |
CV147 |
Drier rate, (1= about 2secs) 1-64 [2] |
CV148 |
Compressor/Airpump Start rate [30] |
CV149 |
COMPRESSOR/Airpump run time [20] |
CV150 |
Horn/Whistle Selector,0=std , 1=Playable volume 2=Alternate [0] |
CV151 |
PEAK speed to allow AUTO coupler/brake on DIR change and F3 on. 0-60 [48] |
CV152 |
Author ID Digitrax=0xDD/221 [221] |
CV153 |
Project ID Steam/SD38_2 [5] |
CV154 |
Steam Blowdown/Safety vol 0-64 [60] |
CV155* |
Notching/Slip Mode,0=AUTO, 1=SEMIAUTO,2=MANUAL NOTCHES [0] |
(C) General Notes
The SDH104K1 decoder is used in conjunction with FN04 4 line FX3-type function decoder .
SDH104K1 responds as per standard FX3 decoder (e.g. DH163D) for CV1-120.
FN04 does not respond to/execute any CV programming in SoundCV (SCV) range CV121-255.
Both decoders have CV15/16 lock capability for advanced users.
*For CV155=01 ["Semi_automatic Notching"] when CV60=1=Diesel, the Prime mover lowest Notch setting is set by
the throttle speed setting. F6 (ON) can increase the Notch and F7 (ON) will decrease the Prime mover
to the minimum notch set by current throttle setting.
**A Note about Steam Chuff/Cam configuration: CV133 and CV134 work together to control chuff timing:
CV133 Steam Chuff/CAM config, 128=>EXT cam, 1-127=>DRIVER dia in inches[63]
CV134 Steam gear ratio trim, 32=100% ratio, [32]
Setting CV133's value from 1-127, puts the SFX064D into 'Autochuff' mode. Autochuff mode tells the decoder to simulate driver chuff timing in software. The CV133 default value is 63, approximating a real-world loco driver diameter of 63 inches. If you halve this figure you will effectively double the chuff rate for a given loco speed.
CV134 (gear ratio) also effects the Autochuff rate. The CV134 default value of 32 assumes no gear reduction. Doubling this value to 64 tells the decoder to simulate a 2:1 gear reduction thereby doubling the chuff rate. CV134 and CV133 work together to create the desired chuff rate in your locomotive.
A final note on Chuff support - Setting CV133 to a value of 128 tells the SFX064D that you want to configure an actual cam input on your locomotive. CV134-->128 tells the decoder to activate the white cam input wire on the 10 pin sound harness of the SFX064D (see diagram below)
A chuff will be triggered when a pulse of over 6 volts or DCC track voltage is seen on the white CAM input lead. This voltage has to go off (0 volts) before the next chuff can be triggered.
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