KB237: CV29 - Configuration Register - The Addition Method

This article was last updated on May 18, 2012, 5:19 p.m. | Print Article | Leave Feedback

CV29 sets the characteristics for 5 different decoder behaviors. The table below shows each characteristic and its value if it is on or off. Notice that if the switch is off the value is zero.

Click here to go to the automated CV29 value calculator

To determine the value to program for your decoder just go down the list and add up the numbers for all the switches you want to set as ON. If you need to convert the decimal value

CV29 Examples of CV Values
: The factory default value for CV29 is 06.

Switch #

Characteristic if OFF

Value

if OFF

Characteristic if ON

Value

If ON

01

NDOT forward

00

NDOT reverse

01

02

14 speed steps

00

28/128 speed steps

02

03

Analog mode conversion off

00

Analog mode conversion on

04

04

Speed table off

00

Speed table on

10

05

2 digit addressing

00

4 digit addressing

20


All Digitrax decoders are shipped from the factory with a value of 06 programmed in CV29. This shaded features below are the factory default characteristics.

Switch #

Characteristic if OFF

Value

if OFF

Characteristic if ON

Value

If ON

01

NDOT forward

00

NDOT reverse

01

02

14 speed steps

00

28/128 speed steps

02

03

Analog mode conversion off

00

Analog mode conversion on

04

04

Speed table off

00

Speed table on

10

05

2 digit addressing

00

4 digit addressing

20

Total "ON" Value to Program in CV29

06


Note: 06 hex is the same as 06 decimal.

For example, value of 27 programmed into CV29 will give your decoder the following characteristics: a normal direction of travel in reverse, operates in advanced 28/128 speed step mode, has analog mode conversion enabled, does not use a speed table and has 4 digit addressing.

Switch #

Characteristic if OFF

Value

if OFF

Characteristic if ON

Value

If ON

01

NDOT forward

00

NDOT reverse

01

02

14 speed steps

00

28/128 speed steps

02

03

Analog mode conversion off

00

Analog mode conversion on

04

04

Speed table off

00

Speed table on

10

05

2 digit addressing

00

4 digit addressing

20

Total "ON" Value to Program in CV29

27



On DT100 throttles (which use hexadecimal numbers) as you turn the throttle right hand knob to the right on a throttle, you will see 00, 01, 02, 03, 04, 05, 06, 07, 08, 09, 0A, 0b, 0c, 0d, 0E, 10, 11, 12 etc.

Because the 6 & b look very similar on the display, be careful.

If you use 0b, for example, as the value for CV29 you won't get the 06 effects you are expecting!

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