Page 8 H0 Sound Decoder MX640
CV
Designation
Range
Default
Description
#29
Basic
configuration
CV #29 is calculated by
adding the value of the
individual bits that are
to be “on”:
Values to turn Bit “on”:
Bit 0: 1
Bit 1: 2
Bit 2: 4
Bit 3: 8
Bit 4: 16
Bit 5: 32
Bit 6: 64
Bit 7: 128
ZIMO MX21, MX31…
cabs also display the
individual bits;
calculating bit values is
no longer necessary!
0 - 63
14 =
0000 1110
Bit 0 - Train direction:
0 = normal, 1 = reversed
Bit 1 - Number of speed steps:
0 = 14, 1 = 28
Note: 128 speed steps are always active if corresponding in-
formation is received!
Bit 2 - DC operation (analog): *)
0 = off 1 = on
Bit 3 - RailCom („bidirectional communication“)
0 = deactivated
1
= activated
Bit 4 - Individual speed table:
0 = off, CV #2, 5, 6, are active.
1 = on, according to CV ‘s #67 – 94
Bit 5 - Decoder address:
0 = primary address as per CV #1
1 = ext. address as per CV #17+18
Bits 6 and 7 are to remain 0!
Example:
#29 = 2: normal direction, 28 speed steps,
DCC operation only, speed table accord-
ing to CV #2, 5, 6, primary address as in
CV #1.
#29 = 14: DC mode and RailCom added.
#29 = 22: DC mode and individual speed table
according to CVs #67 – 94 added.
#29 = 0: 14 (instead of 28) speed steps,
necessary for some older third party
systems.
*) For polarity dependent
DC braking,
set
CV
#29, Bit 2 = “0” and CV #124, Bit 5 = “1”
!
*) For polarity independent DC braking (
Märk-
lin brake-modules
) set CV #29, Bit 2 = “0” and
CV 124, Bit 5 = “1” and additionally CV #112,
Bit 6 = 1!
#33
#34
#35
#36
#37
#38
#39
#40
#41
#42
#43
#44
#45
#46
Function mapping
according to
NMRA standard
(See „Function
mapping“)
1
2
4
8
2
4
8
16
4
8
16
32
64
128
Function mapping according to NMRA:
#33 - 46 = 1, 2, 4... Outputs are set to
F0 - F12 by default. Headlight
switches with direction and can
be turned on/off with F0 key
(Key #1 or L on Zimo cab).
Also see "NMRA function mapping" at the end
of this chapter.
CV
Designation
Range
Default
Description
#49
Signal controlled
acceleration
ZIMO “HLU” -
Method
0 - 255
0
Entered value multiplied by .4 equals accelera-
tion time in seconds from stop to full speed
when:
“ZIMO signal controlled speed influence” (re-
quires ZIMO MX9 or MX900 track section
module)
or “asymmetrical DCC signal” method (Lenz
ABC) is employed.
#50
Signal controlled
deceleration
ZIMO „HLU“
-
Method
0 - 255
0
Entered value multiplied by .4 equals accelera-
tion time in seconds from full speed to com-
plete stop when:
“ZIMO signal controlled speed influence” (re-
quires ZIMO MX9 or MX900 track section
module)
or “asymmetrical DCC signal” method (Lenz
ABC) is employed.
#51
#52
#53
#54
#55
Signal dependent
speed limits
#52 for “U”,
#54 for “L”,
#51, 53, 55
for intermediate
steps
0 - 252
20
40 (U)
70
110 (L)
180
Each of the 5 speed limits (CV’s #51 – 55) that
can be applied with the ZIMO “signal controlled
speed influence” can be defined with an inter-
nal speed step.
These CV’s are also intended for use with the
“asymmetrical DCC signal stop” in case it’ll be
further developed for more speed limits.
#56
Back-EMF control
P and I value
Recommended for
coreless
motors,
i.e. MAXXON,
FAUL-HABER:
CV #56 = 100
(default of 55 is not
suitable)
0 - 199
(See add.
notes)
0
( = to 55,
mid-range)
Back-EMF compensation is calculated by PID
algorithm (Proportional/Integral/Differential);
modifying these values may improve the com-
pensation characteristics in certain cases.
0 - 99: for „normal“ DC motors
100 - 199: for coreless (MAXXON,
Faulhaber,etc)
Tens digit: Proportional (P) value; by default (0)
is set to mid value and automatic adjust-
ment with the goal of jerk free running.
Proportional effect can be modified with
settings of 1 – 4 and 6 – 10 (instead of
the default 0 = 5).
Ones digit: Integral (I) value; is set by default to
a mid value. The Integral effect can be
modified with settings of 1 – 9 instead of
the default 0 = 5).
#57 Voltage
reference
0 - 255
(See add.
notes)
0
The entered value divided by ten is the peak
voltage applied to the motor at full speed.
#57 = 0: results in automatic adjustment to cur-
rent track voltage (relative reference).
#58
Back-EMF
intensity
0 - 255
(See add.
notes)
255
Intensity of back-EMF control for lowest speed
step.
Example:
# 58 = 0: no back-EMF
# 58 = 150: medium compensation,
