D808

D808
D808
8 function decoder
$129.95
Dimensions:
1.45 x 3.75 x ..625 inches
37 x 96 x 15 mm
Decoder version 3.5
This decoder is rated at 8 Amps (30 Amp stall)
This is an EPF (extended packet format) decoder supporting:
9 Silent Running TM High frequency motor drive eliminates motor hum or buzz
9 Torque Compensation for ultra smooth low speed performance
9 Programmable Start, Mid and Maximum speed works for all speed modes
9 Motor rating 4 Amp continuous, 10 Amp peak (stall)
9 8 function outputs - each rated at ½ Amp.
9 Select from 15 different lighting effects (Mars, strobes, beacons, flicker, etc)
9 Function outputs can be mapped to different functions (highly compatible
with SoundtraxxTM DSX decoders)
9 Two or Four digit addressing
9 Uploadable speed table interpolated to 128 speed steps
9 28 and 128 Speed mode operation (always works internally at 256 steps)
9 Decoder assisted consisting
9 Supports all forms of DCC programming
9 New decoder programming ‘lock’ mechanism
This book, schematics and artwork copyright 2004
NCE Corporation Webster, NY 14580
Decoder Installation Notes:
Note: This decoder is covered in clear heatshrink tubing that is designed to keep the
aluminum heatsink plate attached to the bottom of the decoder. Do not remove this tubing.
The most important part of a successful decoder installation is proper isolation of both motor
brushes from the track so that they are driven only by the decoder. Failure to isolate the motor will
definitely damage the decoder. Damage caused by failure to isolate the motor is not covered by the
decoder warranty.
DC BRUSH
MOTOR
Left Track Power Pickup
Motor Motor +
LEFT RAIL (Fireman's Side)
Right Track Power Pickup
RIGHT RAIL
(Engineer's Side)
Before test running your newly converted locomotive on full power double check your wiring to make
sure the motor is fully isolated and that there are no pinched or broken wires. We see many
decoders returned due to wires getting pinched between the body shell and frame causing shorts.
Always test your decoder installation on an current limited programming track before
trying it on full track power.
We recommend that the first "full power" testing be done on regular DC. If the pickup polarity is
reversed you will want to correct this for proper analog mode operation. The decoders should be
driven by a good quality smooth DC power unit. Power packs with pulse power systems such as
"tracking control", etc. will give unpredictable operation.
Analog operation is included in NCE decoders so you will be able to run on conventional DC layouts
without having to remove the decoder or rewire your locomotive.
10 Pin Connector
COMMON
COMMON
F6
F5
D808 DECODER
Left Rail
F4
F3
F2
F1
REARLIGHT
HEADLIGHT
Motor Motor +
Right Rail
OUTPUT 8
OUTPUT 7
OUTPUT 6
OUTPUT 5
OUTPUT 4
OUTPUT 3
OUTPUT 2
OUTPUT 1
Decoder Connection Diagram
Last revised: 11 June 2004
D808
Page 2
Fine tuning locomotive operation
The factory settings normally provide good performance for most locomotives in HO-Scale. You
may want to improve or fine tune performance by adjust the starting characteristics or top speed .
There are 6 CVs that define:
¨ The voltage at which the motor starts
¨ How often and how hard the motor gets kicked a slow speeds to keep it turning smoothly.
¨ The maximum motor speed
¨ The mid speed range response characteristics or ‘speed curve’.
¨ Compensation for a motor that runs faster in one direction
Start Voltage - CV2 (Vstart):
This is the amount of voltage sent to the motor when first starting up. We set CV2 so the
locomotive is almost able to maintain movement at speed step 1. We then use CV116 and 117 to
apply enough torque compensation to keep it turning on speed step 1. Typical values for CV2 are in
the range of 0-35.
Torque compensation kick rate - CV116:
How frequently the motor is ‘kicked’ at slow speed. Typical adjustment is 2 to 4. The smaller the
number the more often the motor gets a brief voltage ‘kick’. Factory default is 0 (off). A value of 1
applies kicks continuously. The maximum practical value is about 6.
Torque compensation kick strength - CV117:
How hard the motor is ‘kicked’ at slow speed. Typical adjustment is 4 to 25 The larger the number
the more voltage is applied in each ‘kick’. The strength of these kicks fade out ratiometrically as
speed is increased providing a smooth transition to normal motor operation. Factory default is 0
(off), usable range 0-50.
Vmax - CV5: If your locomotive runs too fast you can use CV5 to lower its maximum speed.
Setting CV5 to 255 uses the maximum possible voltage to run the motor when full speed is
requested. Set CV5 to a smaller value to reduce the top speed. A value of 128 will yield
approximately ½ full voltage to the motor at top speed. 192 will provide about ¾ full voltage. All
speeds from the middle speed step to the maximum will be proportionally reduced (see diagram). If
CV5 is set to 0 the decoder will use 255 for maximum speed. Always make sure CV5 is greater than
CV6 to avoid erratic operation.
Vmid - CV6: CV6 determines how the motor responds through its middle speed ranges to
advancement of the throttle. If you set CV6 lower than half the maximum speed you’ll have smaller
increases in motor speed through the lower speed ranges. Then, as you hit the upper speed ranges
there will be larger increases between speed steps. In the diagram below you can see this best
illustrated by the ‘customized’ line. If you set Vstart larger than 0 you’ll will most likely want to raise
Vmid so a reasonable slope is maintained in the ‘speed curve’. If CV6 is set to 0 the decoder will
use 127 as the value. If you use high values in CV117 you will want to increase CV6 by a
proportional amount to keep a smooth acceleration curve.
Reverse trim (also forward trim) - CV95:
Values from 1-127 make decoder run faster in reverse than forward. 1 is one speed step faster in
reverse, 2 is two steps faster, etc.
Values from 129-255 make decoder run faster in forward than reverse. 129 is one speed step
faster in forward, 130 is 2 speed steps faster, etc. 0 and 128 add nothing to either direction.
255
factory default
192
Vmax
Voltage
128
custom ized
Vmid
064
Vstart
Motor 'Speed Curve'
000
1
32
64
96
128
Speed steps
Last revised: 11 June 2004
D808
Page 3
Function mapping and effects programming examples
Ditch lights:
What we want to do:
• Use outputs 3 and 4 (violet and brown wires) for the left and right ditch lights
• They will be controlled by F2 which is the HORN button on most DCC systems
• They should continue flashing for 5 seconds after the HORN button is released
How to do it:
¨ Program outputs 3 and 4 to both be activated by F2. Set the F2 mapping CV (CV36) to 12 (0C
hex). We get the value of 12 by adding the ‘bit weights’ for output 3 and output 4 on the F2 line
of the CV mapping table on page 5.
¨ Program outputs 3 and 4 for ditch light operation. Set CV123 to 56 and CV122 to 60. Using
these values the lights will be ‘qualified’ by the headlight AND function 2. The headlight must be
on for the ditch lights to be activated by F2. Type 1 ditch lights are on constantly on when the
headlight is on and alternately flash when the horn is blown. Type 2 ditch lights are normally off
until the horn is blown. This example is for the more common Type 1. If you prefer Type 2 use
EFX values 52 and 48 instead of 60 and 56.
¨ CV118 sets the amount of time the ditch lights stay flashing after the horn (F2) is deactivated.
The time is measured in 1/4 second intervals, for a hold time of 5 seconds put a value of 20 in
the CV118.
¨ One last thing: Set CV35 to 0 so output 4 is not also controlled by F3.
Mars Light:
What we want to do:
• Use output 2 (green wire) for the Mars light.
• It is to be on in the forward direction only
How to do it:
¨ Output 2 is already activated by F1 (factory default setting of CV35=2).
¨ Configure output 2 as a forward only Mars light. Set CV121 to 9. We get the value of 9 by
using 8 (Mars Light) plus 1 (output operates only in forward direction)
Rule 17 lighting:
What we want to do:
• Use output 1 (white wire) for the Headlight
• Headlight is to be on bright in both directions of travel
• We also want to dim the headlight
How to do it:
¨ Output 1 is already activated by F0 (factory default setting of CV33 =1).
¨ Configure output 1 as a standard output, on in both directions, yet dimmable when F4 is
activated. Set CV120 to 32 (20 hex). You can optionally set CV120 to 36 is you want F8 to
control the dimming instead of F4.
Switcher:
What we want:
• Headlights that dim in the opposite direction that the locomotive is travelling
• Use output 1 (white wire) as Headlight and 7 (yellow wire) as Rearlight
How to do it:
Æ Output 1 and 7 are already activated by F0 due to the factory default settings.
Æ Configure output 1 as bright in forward dim in reverse . Set CV120 to 44 (2C hex)
Æ Configure output 1 as bright in reverse dim in forward . Set CV126 to 40 (28 hex)
Last revised: 11 June 2004
D808
Page 4
Description of EFX configuration CVs
CV120 - Lighting effect configuration for output 1 (labeled “1” on 10 pin connector).
CV121 - Lighting effect configuration for output 2 (labeled “2” on 10 pin connector).
CV122 - Lighting effect configuration for output 3 (labeled “3” on 10 pin connector).
CV123 - Lighting effect configuration for output 4 (labeled “4” on 10 pin connector).
CV124 - Lighting effect configuration for output 5 (labeled “5” on 10 pin connector).
CV125 - Lighting effect configuration for output 6 (labeled “6” on 10 pin connector).
CV126 - Lighting effect configuration for output 7 (labeled “7” on 10 pin connector).
CV127 - Lighting effect configuration for output 8 (labeled “8” on 10 pin connector).
Each output wire can select from 15 different lighting effects by using its associated EFX
configuration CV. Pick the value for the CV from the table below, add 1 or 2 if you want
the effect to be directional (footnotes 2 and 3), then add 128 if you are using a white LED
for the effect. Ditch lights should not be made directional, they’re not dierectional in real
life.
bit weight
128
64
bit name
LED
---
1
32
16
8
4
Effect configuration
Value for Description of lighting effect
CV
2
1
REV
FWD3
2
Hex (for
Digitrax users)
0
Standard on/off function output
0
4
Firebox flicker (brighter when accelerating)
4
8
Mars light
8
12
Rotary Beacon
0C
16
Gyralight
10
20
Double Strobe
14
24
Strobe A
18
28
Strobe B (alternates with Strobe A)
1C
32
Dim when F0 and F4 on, otherwise bright
20
36
Dim when F0 and F8 on, otherwise bright
24
40
Dim in forward, bright in reverse
28
44
Dim in reverse, bright in forward
2C
48
Type 2 Right Ditch light, effect on if F2 on, output
off otherwise
30
52
Type 2 Left Ditch light, effect on if F2 on, output
off otherwise
34
56
Type 1 Right Ditch light, effect on if F0 and F2
on, bright if F0 on and F2 off, off if F0 off
38
60
Type 1 Left Ditch light, effect if F2 and F0 on,
bright if F0 on and F2 off, off if F0 off
3C
1 - Functions are designed to use 12-16 volt 30-40ma incandescent lamps. If you are using a white
LED (with 1K limiting resistor) add 128 to the CV value.
2 - If you want the function to be active only in the reverse direction add 2 to the CV value
3 - If you want the function to be active only in the forward direction add 1 to the CV value
Last revised: 11 June 2004
D808
Page 5
Description of function mapping CVs:
Function mapping can change which output wire(s) are controlled by a function command from your
handheld cab. It is possible to have one command control several outputs. In the tables below each
row corresponds to a function mapping CV and each column indicates an output number. A ‘1’
under an output number means that output will be controlled by the function corrsponding to the row.
In the table below the factory value of CV33 is 1 which means F0 will control Output #1.
The tables below show the original factory settings for each mapping CV. The NMRA
recommended practices do not provide for mapping all functions to all outputs. The tables below are
the prescribed function mapping dictated by NMRA RP-9.2.2. Note: In this decoder CV33 and CV34
operate identically. They are not directional...directionality is provided in the EFX configuration CV
for each output.
Factory default function mapping values
OUTPUT NUMBER
8
7
6
5
4
3
2
1
CV33 F0 Fwd
128
64
32
16
8
4
2
1
CV34 F0 Rev
128
64
32
16
8
4
2
1
CV35 F1
128
64
32
16
8
4
2
1
CV36 F2
128
64
32
16
8
4
2
1
CV37 F3
128
64
32
16
8
4
2
1
CV38 F4
16
8
4
2
1
CV39 F5
16
8
4
2
1
CV40 F6
16
8
4
2
1
CV41 F7
2
1
CV42 F8
2
1
CV43 F9
2
1
CV44 F10
2
1
CV45 F11
2
1
CV46 F12
2
1
Recommend dropping resistors if using 1.5 volt bulbs
Track Voltage
Bulb Current
12.5
13
13.5
14
14.5
15
15.5
16
Wattage
15ma
680
680
720
750
820
820
910
910
¼ watt
30ma
330
360
360
390
390
430
430
470
½ watt
40ma
240
270
270
300
300
300
330
330
1 watt
50ma
200
200
220
220
240
240
270
270
1 watt
60ma
160
180
180
200
200
200
220
220
1 watt
80ma
120
130
130
150
150
160
160
160
2 watt
Last revised: 11 June 2004
D808
Page 6
CV
1
2
Default value
Description
Factory default values for
decimal hex
03
short address
3
00
start voltage
0
CV
Default value
hex
decimal
0
0
0
0
Description
decoder Configuration Variables (CVs)
74
75
alt spd table step 8
alt spd table step 9
3
0
00
acceleration
76
0
0
alt spd table step 10
4
0
00
deceleration
77
0
0
alt spd table step 11
5
0
00
Maximum speed
78
0
0
alt spd table step 12
6
0
00
Mid speed
79
0
0
alt spd table step 13
17
192
C0
long address high byte
80
0
0
alt spd table step 14
18
0
00
long address low byte
81
0
0
alt spd table step 15
19
0
00
consist address
82
0
0
alt spd table step 16
21
255
FF
consist functions F1-F8
83
0
0
alt spd table step 17
22
63
3F
consist function FLF,FLR
84
0
0
alt spd table step 18
23
0
00
acceleration adjust
85
0
0
alt spd table step 19
24
0
00
deceleration adjust
86
0
0
alt spd table step 20
29
2
02
decoder configuration
87
0
0
alt spd table step 21
30
0
00
reset register
88
0
0
alt spd table step 22
33
1
01
Output(s) controlled by F0
89
0
0
alt spd table step 23
34
64
20
Output(s) controlled by F0
90
0
0
alt spd table step 24
35
2
02
Output(s) controlled by F1
91
0
0
alt spd table step 25
36
4
04
Output(s) controlled by F2
92
0
0
alt spd table step 26
37
8
8
Output(s) controlled by F3
93
0
0
alt spd table step 27
38
2
02
Output(s) controlled by F4
94
0
0
alt spd table step 28
39
4
04
Output(s) controlled by F5
95
0
0
Reverse trim
40
16
10
Output(s) controlled by F6
116
0
0
Kick rate
41
4
04
Output(s) controlled by F7
117
0
0
Kick strength
42
0
0
Output(s) controlled by F8
118
20
14
Ditch light hold time
43
0
0
Output(s) controlled by F9
119
255
FF
EFX page access
44
0
0
Output(s) controlled by F10
120
1
01
Output 1 EFX generator
45
0
0
Output(s) controlled by F11
121
2
02
Output 2 EFX generator
46
0
0
Output(s) controlled by F12
122
0
00
Output 3 EFX generator
67
0
0
alt spd table step 1
123
0
00
Output 4 EFX generator
68
0
0
alt spd table step 2
124
0
00
Output 5 EFX generator
69
0
0
alt spd table step 3
125
0
00
Output 6 EFX generator
00
00
Output 7 EFX generator
70
0
0
alt spd table step 4
126
0
71
0
0
alt spd table step 5
127
0
72
0
0
alt spd table step 6
73
0
0
alt spd table step 7
Table of commonly used values for CV29
Value for CV29
decimal
hex
0
2
6
6
18
12
22
16
34
22
38
26
50
32
54
36
Long/Short
Address
Short
Short
Short
Short
Long
Long
Long
Long
Uploadable/Factory Analog (DC)
Speed table
operation
Factory
Factory
Uploadable
Uploadable
Factory
Factory
Uploadable
Uploadable
no
yes
no
yes
no
yes
no
yes
Output 8 EFX generator
Speed mode
28/128
28/128
28/128
28/128
28/128
28/128
28/128
28/128
Hex numbers are provided for early Digitrax users
Notes:
If you want to reverse the direction of travel on DCC increase the value for CV29
by one (this also reverses all directional lighting).
If you want to reverse the DC direction reverse the track pickup wires.
Last revised: 11 June 2004
D808
Page 7
Configuration Variables used by V3.5 Decoders
CV1
Short decoder address; 1-127 valid
CV2
Start Voltage (useful range 0-100)
CV3
Acceleration rate (each unit = 7mS between speed steps) 255 max.
CV4
Deceleration rate (each unit = 7mS between speed steps) 255 max.
CV5
Vmax, speed at highest speed step. 0=use factory default of 255
CV6
Vmid, speed (on a scale of 1-255) at speed step 7,14,or 63. 0=use default of 127
CV7
Decoder version number. This decoder is 35 which means version 3.5
CV8
Manufactuer ID. NCE = 11 (0B hex)
CV11
Packet timeout value (in ½ second increments) Time the decoder will wait before braking to a
stop after running into a section of track with DC power. 0=Don’t brake
CV15
Decoder programming lock “KEY”. This CV is always programmable even when “locked”
CV16
Decoder programming lock ID. When CV15=CV16, programming is unlocked and the
decoder will respond to programming commands. If CV15 is not equal to CV16 then
decoder programming is locked and it will not program (except CV15) or read.
CV17
High byte of long (4 digit) address
- bit 6,7 always= 1
- bits 0-5 are upper 6 bits of address
CV18 Low byte of long (4 digit) address
CV19 Consist address. (0 or 128 = no consist active)
- bits 0-6 short consist address (1-127 valid)
- bit 7
0= direction is normal, 1= direction is reversed
CV21
Functions active in consist mode. Bit 0 controls F1,bit 1=F2, bit 2=F3, etc.
- bit 0 - 1=function can be controlled at consist address, 0 = no consist control
CV22
Functions active in consist mode. Bits 0,1 control FLF and FLR respectively
each bit 1=function can be controlled at consist address, 0 = no consist control
CV29 - bit 0 1= direction of operation is reversed, 0= direction is normal
- bit 1 1=28 speed mode (always enabled)
- bit 2 1= analog operation mode enabled, 0 = disabled
- bit 4 1= alternate speed table active, 0= use table defined by CV2,5,6
- bit 5 1= use long address in CV17/18, 0= use short address CV1
- bits 3,6,7 are ignored by the decoder
CV30
Set this CV to 2 on the programming track and the decoder will reset to factory settings.
CV33-CV46 function mapping CVs for F0-F12
CV67-CV94 Uploadable speed table steps 1-28 (128 speed mode calculates intermediate steps)
CV95 Reverse trim, values 1-127 add to reverse speed, values 129-255 add to forward speed
CV116 Torque kick rate - number of 16ms periods in a row that motor is ‘kicked’ with voltage pulse
CV117 Torque kick strength - how much voltage is used to kick the motor at slow speeds. Reduces
to 0 as speed is increased.
CV118 Ditch light hold time (in ¼ second increments) after F2 goes off.
CV120-CV128 Effects configuration registers for outputs 1-8
CV NOTES: All CV numbers not listed above are ignored.
This decoder supports all DCC programming methods.
Formula for computing the long address if using a Lenz System:
If using a Lenz SET01, SET02, SET90, SET100 or other entry level system, use paged programming
mode and see the note below for programming long addresses.
CV17 = 192 + (the whole number portion of the long address divided by 256)
CV18 = the remainder of the long address divided by 256
CV29 = 34 if analog mode disabled, 38 if analog mode enabled
Decoder Warranty
This decoder is fully factory tested and warranted against manufacturing defects for a period of 1 year. As the
circumstances under which this decoder is installed can not be controlled, failure of the decoder due to installation
problems can not be warranted. This includes misuse, miswiring, operation under loads beyond the design range of
the decoder or short ciruits in the locomotive manufacturer’s factory wiring. If the decoder fails for non-warranted
reasons NCE will replace D408 decoders, no questions asked, for $25 U.S. plus $2 shipping. For warranty or
non-warranty replacement send the decoder (and any payment, if required) to:
NCE Warranty Center
899 Ridge Road
Webster, New York 14580
05240112
05240112
The terms Silent Running, Powerhouse Pro, Power Pro, Powerhouse Digital Command Control, ProCab, Smartcab, Switch-It,
Snap-It, the NCE logo with “Power of DCC” slogan and EFX are trademarks of NCE Corporation. Digitrax is a trademark of
Digitrax Inc.
Last revised: 11 June 2004
D808
Page 8
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