Hornby R8249 4 Function 8 Pin Locomotive DCC Decoder

£26.75
MRP £26.75
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Bristol: 1, Gloucester: 3, Plymouth: 4, Stroud: 5
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(Product Ref 73564)
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Motor output 500mA continuous, 1A peak.
Function outputs 100mA
Address 0-9999

List of supported CVs

CV Name

CV

Default

Description

Primary Address

1

3

Bits 0-6 contain an address with a value between 1 and 127. Bit seven must have a value of "0". If the value of Configuration Variable #1 is "00000000" then the decoder will go out of NMRA digital mode and convert to the alternate power source as defined by Configuration Variable #12.

Acceleration Rate

3

5

Determines the decoder's acceleration rate. The formula for the acceleration rate shall be equal to (value of CV 3 X 0.896) / (number of speed steps in use).

Deceleration Rate

4

5

Determines a decoders braking rate.

Manufacturer Version No.

7

13

Manufacturer defined version info

Manufacturers ID

48

Values assigned by NMRA

EMF Feedback Cutout

10

128

Contains a value between 1 and 128 that indicates the speed step above which the back EMF motor control cuts off.

Extended Address

17-18

The Extended Address is the locomotives address when the decoder is set up for extended addressing (indicated by a value of "1" in bit location 5 of CV#29). CV#17 contains the most significant bits of the two byte address and must have a value between 11000000 and 11100111, inclusive, in order for this two byte address to be valid. CV 18 contains the least significant bits of the address and may contain any value.

Configuration Data #1

29

Decoder Configuration byte 1
Bit 0 = Locomotive Direction: "0" = normal, "1" = reversed. This bit controls the locomotive's forward and backward direction in digital mode only. Directional sensitive functions, such as headlights (FL and FR), will also be reversed so that they line up with the locomotive's new forward direction.
Bit 1 = FL location: "0" = bit 4 in Speed and Direction instructions control FL, "1" = bit 4 in function group one instruction controls FL.
Bit 2 = Power Source Conversion: "0" = NMRA Digital Only, "1" = Power Source Conversion Enabled.
Bit 5 = "0" = one byte addressing, "1" = two byte addressing (also known as extended addressing).

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