CV Calculators
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 for | Normal Rate | Adjusted Rate |
|---|---|---|
| Stop → Full / Full → Stop | 1.792 seconds | 1.792 seconds |
| Per speed step (128 steps) | 0.014 seconds | 0.014 seconds |
| Per speed step (28 steps) | 0.064 seconds | 0.064 seconds |
| Per speed step (14 steps) | 0.128 seconds | 0.128 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.
| Bit | On/Off | Allows |
|---|---|---|
| 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.
| Bit | On/Off | Allows |
|---|---|---|
| 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.
| Bit | On/Off | Controls |
|---|---|---|
| 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.
| Bit | On/Off | Controls | Ticked | Unticked |
|---|---|---|---|---|
| 0 | Reverse | Normal | ||
| 1 | 14 | 28 or 128 | ||
| 2 | Enabled | Disabled (DCC only) | ||
| 3 | Enabled | Disabled | ||
| 4 | Use CVs 2, 5, and 6 | Use CVs 66-95 | ||
| 5 | Long address | Short address | ||
| 6 | ||||
| 7 | locomotive | accessory | ||