CV Calculators

3 (Acceleration Rate) | 4 (Deceleration Rate) | 12 (Power Source Conversion) | 17&18 (Extended Address) | 19 (Consist Address) | 23 (Acceleration Adjustment) | 24 (Deceleration Adjustment) | 27 (Automatic Stopping) | 28 (Bi-Directional Communication) | 29 (Configuration Data #1)

CV3 / CV4 (Acceleration / Deceleration Rate) &
CV23 / CV24 (Acceleration / Deceleration Adjustment)

Acceleration and deceleration are each controlled by 2 CVs, the first (CV3 or CV4) controls the normal rate. The second (CV23 or CV24) contain a change which can be applied when certain conditions (decoder specific) are met, e.g. to allow a light loco to respond snapier than a loco hauling a rake of loaded wagons.

Time forNormal RateAdjusted Rate
Stop → Full / Full → Stop1.792 seconds1.792 seconds
Per speed step (128 steps)0.014 seconds0.014 seconds
Per speed step (28 steps)0.064 seconds0.064 seconds
Per speed step (14 steps)0.128 seconds0.128 seconds

CV12 (Power Source Conversion)

CV12 contains the permitted alternate power sources when the decoders primary (short) address is set to 0.
You can either tick/untick the boxes and read the number to write to the decoder or type the number read from the decoder into the box and see what'enabled/disabled.

BitOn/OffAllows
0
1
2
3
4
5
6
7

CV17 & CV18 (Extended Address)

CVs17&18 contain the extended (long) address of the locomotive.
You can either set an address read the numbers to write to the decoder or type the numbers read from the decoder and see what the address is.
Don't forget to set CV29 bit 5.


CV19 (Consist Address)

CV19 contains the address of the consit this locomotive is in (0 = not in a consist), along with if the locomotive is backwards or not.
You can either set an address and reverse state and read the number to write to the decoder or type the number read from the decoder into the box and see what the address and reverse state is.


CV27 (Automatic Stopping)

CV27 contains 8 bits which individually control certain behaviours of the decoder.
You can either tick/untick the boxes and read the number to write to the decoder or type the number read from the decoder into the box and see what'enabled/disabled.

BitOn/OffAllows
0
1
2
3
4
5
6
7

CV28 (Bi-Directional Communication)

CV28 contains 8 bits which individually control certain behaviours of the decoder.
You can either tick/untick the boxes and read the number to write to the decoder or type the number read from the decoder into the box and see what'enabled/disabled.

BitOn/OffControls
0
1
2
3
4
5
6
7

CV29 (Configuration Data #1)

CV29 contains 8 bits which individually control certain behaviours of the decoder.
You can either tick/untick the boxes and read the number to write to the decoder or type the number read from the decoder into the box and see what'enabled/disabled.

BitOn/OffControlsTickedUnticked
0ReverseNormal
11428 or 128
2EnabledDisabled (DCC only)
3EnabledDisabled
4Use CVs 2, 5, and 6Use CVs 66-95
5Long addressShort address
6
7locomotiveaccessory