SoundTraxx DSD-150/DSX Owners Manual - Manual (Page 27)

Digital Sound Decoder Owner's Manual 27
To mitigate some of this noise, the DSD provides CV 9, Motor PWM Period to control the frequency at which the
motor is switched on and off. By adjusting this CV, one can usually find a drive frequency that is quieter than others.
CV 9 can be programmed with any value between 0 and 230 (0xE6). The DSD Technical Reference (see CV 9)
provides suggestions for selecting a proper value. A value between 170 and 190 works well for most locomotives.
Configuring the Lights and Function Outputs
The DSD has four function outputs used for controlling the locomotive lights. Two of these functions, headlight and
backup light, are always used as on-off outputs.
Setting the Hyperlight Effects
The other two functions, F1 and F5 can be also setup for several special Hyperlight lighting effects using CV 49 as
described under Installation, Step 2.
The table below lists the modes for each output and required CV setting:
Table E.
Setting the Hyperlight Effects
CV 49 F5 Output Type F1 Output Type
0 (0x00) On-off On-off
1 (0x01) On-off Mars Light
2 (0x02) On-off Firebox Flicker
3 (0x03) On-off Sync. Firebox
4 (0x04) Mars light On-off
5 (0x05) Mars Light Mars Light
6 (0x06) Mars Light Firebox Flicker
7 (0x07) Mars Light Sync. Firebox
8 (0x08) Firebox Flicker On-off
9 (0x09) Firebox Flicker Mars Light
10 (0x0A) Firebox Flicker Firebox Flicker
11 (0x0B) Firebox Flicker Sync. Firebox
12 (0x0C) Sync. Firebox On-off
13 (0x0D) Sync. Firebox Mars Light
14 (0x0E) Sync. Firebox Firebox Flicker
15 (0x0F) Sync. Firebox Sync. Firebox
Configure Lighting Control
The DSD supports two modes of headlight operation:
Automatic Direction Control
Both the headlight and backup lights are turned on and off using the FL function. The DSD automatically switches the
proper light on depending upon locomotive direction.
“Rule 17” Headlight Operation
This is the more prototypical form of operation and requires the engineer to manually switch each lights on or off
individually. Thus, it is possible for both lights to be on at the same time.
The DSD uses Function Mapping (see Remapping the Functions, below) to determine which mode is used.
For automatic direction control, the headlight is mapped to FL(fwd) by setting CV 33 to 1 (0x01), and the backup light
is mapped to FL(rev) setting CV 34 to 2 (0x02).