770/771 Čmeliak – 8bit Piko H0 Plux22

Sound sample

Project Information

Optimised for the Piko H0 model with a Plux22 connector.
Designed for 8-bit ZIMO MX sound decoders.
Recommended minimum decoder software version is 40.22.
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 Position white lights and headlight

Affected function output: FA0v, FA0r
Direction dependent
F1 Red lights

Affected function output: FA1, FA2
Direction dependent
F2 Destination board lighting

Affected function output: FA7
F3 Shunting mode - left position lights in cross pattern
Affected function output: FA3
- speed range reduced to ½
- reduces acceleration / braking times to ¼ of CV3 and CV4
- triggers short horn at start
F4 Short horn
F5 Coasting

Idle running sound regardless of set speed
F6 Engine acceleration to max RPM

Independent of set speed, even when stationary
F7 Long horn
F8 Sound on/off

Engine
F9 Unused
F10 Short whistle
F11 Long whistle
F12 Uncoupling screw down
F13 Uncoupling screw up
F14 Sanding
F15 Dispatcher whistle - new

Call to readiness
F16 Dispatcher whistle - old

Call to readiness, departure
F17 Compressor
F18 Switching sound sets

Loaded / unloaded locomotive, when stationary
F19 Wheel squealing in curves
F20 Unused
F21 Unused
F22 Unused
F23 Unused
F24 Unused
F25 Unused
F26 Sound muting
F27 Volume decrease
F28 Volume increase

Setting Maximum Speed

Use CV57 to set the maximum speed so the sound range remains unchanged. CV5 alters the sound range and throttle curve, while CV57 keeps CV3/CV4 timings intact.

Shunting Mode

Shunting mode turns on the left marker lights in a cross pattern. Disable it with CV37 = 0 and re-enable with CV37 = 2.

The mode halves the speed range and reduces acceleration/braking times to a quarter of the CV3/CV4 values. Disable it via CV124 = 16; full deactivation is possible with CV124 = 19. The default setting is CV124 = 18.

The script-driven short horn requires F3, 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 (F5) takes precedence.

Compressor

Two script-driven modes:

Random activation when the engine sound (F8) is on; enabling F17 cancels it.
Direct activation via F17 that requires F8 and zero speed.

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

Curve Squeal

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

Custom Function Mapping

Use CV400 – CV428 for custom mapping if needed. The project itself does not rely on these CVs.

Decoder Reset

Program CV8 = 8 whenever you need to restore the default settings.

Basic CV Settings in Project

CV3 = 16
CV4 = 14
CV5 = 1
CV6 = 1
CV29 = 14
CV33 = 1
CV34 = 2
CV35 = 12
CV36 = 0
CV37 = 2
CV38 = 0
CV39 = 0
CV40 = 0
CV41 = 0
CV42 = 0
CV43 = 0
CV44 = 0
CV45 = 0
CV46 = 0
CV57 = 125
CV105 = 145
CV106 = 5
CV124 = 18
CV125 = 88
CV126 = 88
CV127 = 89
CV128 = 90
CV129 = 88
CV159 = 0
CV190 = 3
CV191 = 2
CV254 = 206
CV255 = 3
CV256 = 2
CV266 = 100
CV395 = 130
CV396 = 27
CV397 = 28
CV430 = 2
CV432 = 7
CV434 = 7
CV836 = 0
CV837 = 0

Sound Sample Numbers

F4 CV522 40 Short Horn

F7 CV531 39 Long Horn

F10 CV540 37 Short Whistle

F11 CV543 42 Long Whistle

F12 CV546 38 Screw Coupler Down

F13 CV549 43 Screw Coupler Up

F14 CV552 36 Sanding

F15 CV555 44 New Dispatcher Whistle

F16 CV558 45 Old Dispatcher Whistle

script 46 Compressor

script 47 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.