Non-Sound Decoder MX600 - MX634 and Sound Decoder MX640 - MX658 Page 15
CV
Designation
Range
Default
Description
#29
Basic Configuration
0 - 63
14 =
0000 1
1
10
Bit 2 = 1
(enables
analog op-
eration)
Bit 0 - Train direction:
0 = normal, 1 = reversed
Bit 1 - Number of speed steps:
0 = 14, 1 = 28
Bit 2
– Automatic DC operation (analog): *)
0 = disabled 1 = enabled
Bit 3 -
RailCom („bidirectional communication“)
0 = deactivated 1 = activated
Bit 4 - Individual speed table:
0 = off, CV # 2, 5 and 6 are active.
1 = on, according to CV ‘s # 67 – 94
Bit 5 - Decoder address selection:
0 = short address as per CV #1
1 = long address as per CV #17+18
#13
Analog functions
F1…F8
0 - 255
0
Defines
function outputs that should be “ON” in analog
mode.
Bit 0 = 0: F1 is OFF in analog mode
= 1: …ON in analog mode
Bit 1 = 0: F2 is OFF in analog mode
Bit 1 = 1: …ON in analog mode
………..F3, F4, F5, F6, F7
Bit 7 = 0: F8 is OFF in analog mode
Bit 7 = 1: …ON in analog mode
#14
Analog functions
F9
– F12,
Analog momentum
and
Regulated Analog
0 - 255
64
(equals
Bit 6 = 1)
Defines function outputs that should be “ON” in analog
mode.
Bit 0 = 0: F0 (forw) is OFF in analog mode
= 1: …ON in analog mode
Bit 1 = 0: F0 (rev) is OFF in analog mode
Bit 1 = 1: …ON in analog mode
Bit 2 = 0: F9 is OFF in analog mode
Bit 2 = 1: …ON in analog mode
------------F10, F11
Bit 5 = 0: F12 is OFF in analog mode
Bit 5 = 1: …ON in analog mode
Bit 6 = 0: Analog operation with acceleration and
deceleration according to CV #3 and #4.
Bit 6 = 1: Analog operation without acceleration and
deceleration according to CV #3 and #4.
Bit 7 = 0: unregulated DC operation
Bit 7 = 1: regulated DC operation
Note: Actual decoder settings may differ from the default values if a sound project is on the decoder;
in particular, the motor regulation (CV #14, Bit 7) is often enabled. The regulation only works well with
power packs that apply “clean” DC voltage (i.e. with an LGB 50 080); otherwise it is better to turn the
motor regulation off.
3.6
Motor Regulation
The speed curve
There are two types of speed curves, which are selected with
CV #29, Bit 4
= 0
: 3-step curve (defined by
3 CV’s)
... = 1
: 28-step curve (defined by
28 CV’s)
3-step curve: the lowest, highest and medium speed is defined by the Configuration Variables #2
(Vstart), #5 (Vhigh) and #6 (Vmid). This is a simple way to quickly establish a speed range and its
curvature.
The three-step curve is usually sufficient.
28
– step curve (a.k.a.”free programmable speed table”): with the help of CV’s #67 - 94, all 28 exter-
nal speed steps can be freely assigned to the 128 internal speed steps. These 28 CV’s apply to all
speed step modes (14, 28 and 128). If 128 external speed steps are used, the decoder adds the miss-
ing intermediate values by interpolation.
CV
Designation
Range
Default
Description
#2
Start Voltage
Vstart
with 3-step curve if
CV #29, Bit 4 = 0
1 - 255
1
Internal speed step
(1 … 255) applied as
lowest
external speed step (= speed step 1)
(applies to 14, 28, or 128 speed step modes)
= 1: lowest possible speed
#5
Top Speed
Vhigh
with 3-step curve if
CV #29, Bit 4 = 0
0 - 255
1
corresponds
to
255
Internal speed step (1 … 255) applied as
highest
external speed step
(14, 25 or 128, depending on the speed step mode
selected in CV # 29, Bit 1)
= 1 (same as 255): fastest top speed possible.
#6
Medium Speed
Vmid
1,
¼ to ½
of the val-
ue in
CV #5
1
(= @ 1/3 of top
speed)
Internal speed step (1 … 255) applied as
medium
external speed step (that is, speed step
7, 14 or 63 depending on the speed step mode se-
lected in CV #29, Bit 1)
”1" = default curve (Medium speed is set to one third
of top speed. I.e., if CV #5 = 255 the curve is the
same as if CV #6 would be programmed to 85).
The speed curve resulting from CV #2, 5 and 6 is au-
tomatically smoothed out.
0
10
20
30
40
50
60
70
80
90
100
110
120
130
140
150
160
170
180
190
200
210
220
230
240
250
0 1 2 3 4 5 6 7 8 9
10 11 12 13 14 15 16 17 18 19
20 21 22 23 24 25 26 27 28
0 9 18 27 36 45 54 63 72 81 90 99 108 117 1
26
Example of a freely
programmed speed
curve according to
the values entered
in to configuration
variables #67 - 94.
0
10
20
30
40
50
60
70
80
90
100
110
120
130
140
150
160
170
180
190
200
210
220
230
240
250
0 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19
20 21 22 23 24 25 26 27 28
0 9 18 27 36 45 54 63 72 81 90 99 108 117 1
26
Clipped and bent speed curve
Vstart = 15, Vhigh = 180, Vmid = 60
0
10
20
30
40
50
60
70
80
90
100
110
120
130
140
0 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19
20 21 22 23 24 25 26 27 28
0 9 18 27 36 45 54 63 72 81 90 99 108 117 1
26
Clipped linear speed curve
Vstart = 10, Vhigh = 165,
Vmid = 90
150
160
170
180
190
200
210
220
230
240
250
0
10
20
30
40
50
60
70
80
90
100
110
120
130
140
0 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28
0 9 18 27 36 45 54 63 72 81 90 99 108 117 1
26
Lin
ear
ch
ara
cte
risi
tc
- V
sta
rt=
1, V
hig
h=
25
2,
Vm
id=
12
7
Slightly bent
(default) characterisitc
Vmid = 1 (equals 85)
Vstart = 2
Vhigh = 1
(equals 252)
Center
150
160
170
180
190
200
210
220
230
240
250
In
te
rn
a
l
s
p
e
e
d
s
te
p
External speed step
