850 Krokodíl – 16bit MTB H0 Plux22

Project version 7.3.1
850 Krokodíl – 16bit MTB H0 Plux22
16bit

Sound sample

Project Information

  • Optimised for the MTB H0 model with a Plux22 connector.
  • Designed for 16-bit ZIMO MS sound decoders.
  • Recommended minimum decoder software version is 5.5.
  • The factory default address is 3.
  • Program CV8 = 8 to reset the decoder to the project defaults.

Function Assignment

Function mapping and CV settings can be modified.

  • F0 White marker lights
    Affected function output: FA0v, FA0r
    Direction dependent
  • F1 Red lights
    Affected function output: FA1, FA2
    Direction dependent
  • F2 Headlight
    Affected function output: FA3
    Direction dependent, linked to F0
  • F3 Shunting mode
    Affected function output: FA0v, FA0r
    • speed range reduced to ½
    • reduces acceleration / braking times to ¼ of CV3 and CV4
    • turns off red lights if enabled
    • turns off headlight if enabled
    • triggers a short horn at start
  • F4 Passenger area lighting
    Affected function output: FA6
  • F5 Coasting
    Idle sound regardless of set speed
  • F6 Engine to maximum RPM
    Independent of set speed, even when stationary
  • F7 Short horn
  • F8 Sound on/off
    Engine on/off
  • F9 Driver’s cab light
    Affected function output: FA4, FA5
    Direction dependent, switches off when moving
  • F10 Long horn
  • F11 Unused
  • F12 Screw coupler down
  • F13 Screw coupler up
  • F14 Sanding
  • F15 Dispatcher whistle – new
    Call to readiness
  • F16 Dispatcher whistle – old
    Call to readiness, departure
  • F17 Compressor
    Also random sound
  • F18 Air release
  • F19 Wheel squeal in curves
  • F20 Station announcement
    Train Os 5028
  • F21 Station announcement
    Train Os 5016
  • F22 Station announcement
    Train Os 5048
  • F23 Station announcement
    Train Os 5011
  • F24 Unused
  • F25 Unused
  • F26 Mute sounds
  • F27 Volume down
  • F28 Volume up

Setting Maximum Speed

Use CV57 to set the maximum speed. Changing CV5 alters the sound range, while CV57 leaves the CV3/CV4 acceleration and braking times untouched.

Shunting Mode

All four marker lights turn on in shunting mode. Disable the feature with CV37 = 0 and re-enable it with CV37 = 3. The mode also turns off the red lights and headlight; if you do not want this behaviour, set CV430 = 0 and back to CV430 = 3 when required.

The mode halves the speed range and reduces acceleration/braking times to a quarter of the CV3/CV4 values. Disable it via CV124 = 16; complete deactivation of the timings is possible with CV124 = 19.

If you do not want to use shunting mode at all, set CV124 = 0. The default value is CV124 = 18.

A short horn sounds at every start in shunting mode. This script-controlled feature requires F3 enabled, engine sound on via F8, and starting from zero speed. CV837 = 8 disables it (default CV837 = 0).

F5 Coasting vs F6 Engine to Maximum RPM

If both functions are active, coasting takes precedence.

Cabin Lighting

The driver’s cab light (F9) automatically switches off when the model starts moving and turns back on when it stops. This behaviour is scripted for technological reasons1). Disable it with CV837 = 8 (default CV837 = 0).

For manual control without automatic switching, set CV43 = 96 together with CV837 = 8. Revert to the default by programming CV43 = 0 and CV837 = 0.

1) The decoder can either fade a function output or switch it off while moving, but not both simultaneously without scripting.

Compressor

The compressor is script-controlled in two ways:

  1. Random activation while the engine sound (F8) is on; enabling F17 cancels the random cycle.
  2. Direct activation via F17 that requires F8 on and zero speed.

CV837 = 1 disables F17, CV837 = 2 disables the random mode, and CV837 = 3 disables both.

Curve Squeal

Curve squeal is script-driven and requires F19 and F8 enabled, plus a speed above 14 and below 100 (range 0–126). Set CV837 = 4 to disable the effect.

Custom Function Mapping

You can customise the function layout via CV400 – CV428. The project itself does not use these CVs.

Decoder Reset

If you make a mistake while configuring the decoder or get lost in the settings, program CV8 = 8 (or CV8 = 0) to restore the project defaults.

Basic CV Settings in Project

  • CV3 = 16
  • CV4 = 14
  • CV5 = 1
  • CV6 = 1
  • CV33 = 1
  • CV34 = 2
  • CV35 = 12
  • CV36 = 16
  • CV37 = 3
  • CV38 = 128
  • CV39 = 0
  • CV40 = 0
  • CV41 = 0
  • CV42 = 0
  • CV43 = 0
  • CV44 = 0
  • CV45 = 0
  • CV46 = 0
  • CV57 = 125
  • CV61 = 97
  • CV105 = 145
  • CV106 = 5
  • CV124 = 18
  • CV125 = 88
  • CV126 = 88
  • CV127 = 89
  • CV128 = 90
  • CV129 = 88
  • CV130 = 89
  • CV131 = 90
  • CV132 = 88
  • CV190 = 100
  • CV191 = 50
  • CV254 = 7
  • CV255 = 3
  • CV256 = 1
  • CV266 = 64
  • CV313 = 126
  • CV339 = 6
  • CV340 = 4
  • CV374 = 5
  • CV375 = 0
  • CV395 = 130
  • CV396 = 27
  • CV397 = 28
  • CV430 = 3
  • CV432 = 193
  • CV433 = 195
  • CV434 = 194
  • CV435 = 195
  • CV836 = 1
  • CV837 = 0

Sound Sample Numbers

F7 CV531 20 Short Horn
F10 CV540 20 Long Horn
F12 CV546 27 Screw Coupler Down
F13 CV549 28 Screw Coupler Up
F14 CV552 29 Sanding
F15 CV555 21 New Dispatcher Whistle
F16 CV558 22 Old Dispatcher Whistle
F18 CV564 30 Air Release
F20 CV540 23 Train Os 5028 Announcement
F21 CV543 24 Train Os 5016 Announcement
F22 CV546 25 Train Os 5048 Announcement
F23 CV549 26 Train Os 5011 Announcement
script 17 Compressor
script 18 Wheel Squeal in Curves

"Script" means that the corresponding sound is used inside a script outside the normal CV mapping. The number is provided for standalone use when the script is disabled.