Function-Decoders MX681, MX685, MX686, MX687, MX688 Page 9
CV
Denomination
Range
Default Description
Ones digit: Exponential curve (0 to 9).
EXAMPLE:
CV #122 = 11, 23 or 25 are typical initial test values.
#49
Signal controlled
(HLU)
acceleration
0 - 255
0
Entered value multiplied by 0.4 equals acceleration time
in seconds from stop to full speed
when:
“ZIMO signal controlled speed influence” with ZIMO
MX9 track section module, StEin or successor
or
“asymmetrical DCC signal” method (Lenz ABC) is em-
ployed
#50
Signal controlled
(HLU)
deceleration
0 - 255
0
Entered value multiplied by 0.4 equals deceleration time
in seconds from full speed to complete stop when:
“ZIMO signal controlled speed influence” with
ZIMO MX9 track section module, StEin or successor
or
“asymmetrical DCC signal” method (Lenz ABC) is em-
ployed
#51
#52
#53
#54
#55
Signal controlled
(HLU) speed limits
#52 for “U”,
#54 for “L”,
#51, 53, 55
for intermediate steps
0 - 255
20
40 (U)
70
110 (L)
180
ZIMO “signal controlled speed influence” method (HLU)
using MX9, StEin or successor:
Defines the internal speed steps for each of the 5 speed
limits generated via HLU.
#59
Signal controlled
(HLU)
delay
0 - 255
5
ZIMO signal controlled speed influence (HLU) with
ZIMO MX9 track section module, StEin or future module
or
when using the “asymmetrical DCC signal” stopping
method (Lenz ABC):
Time in tenths of a second until the locomotive starts to
accelerate after receiving a higher signal controlled
speed limit command.
#27
Decoder Automatic
Stopping
Configuration
(Lenz “ABC” method
0, 1, 2, 3
0
Bit 0 = 1: Stops are initiated if voltage in right rail
is higher than in left rail (in direction of
travel). This setting, CV #27 = 1, IS THE
COMMON APPLICATION for this
feature (provided the decoder is wired
correctly to the rail).
Bit 1 = 1: Stops are initiated if voltage in left rail
is higher than in right rail (in direction of
travel).
Stopping is directional if only one of the two bits is set
(not both). Traveling in the opposite direction will have
no effect. Use the other bits In case the train stops in the
wrong direction!
Bit 0 and Bit 1 = 1 (CV #27 = 3): Stops in both
directions, regardless of rail polarity.
CV
Denomination
Range
Default Description
#134
Asymmetrical
threshold
for
stopping with
asymmetrical
DCC signal
(Lenz ABC method).
1 - 14,
101 - 114,
201 - 214
=
0,1 - 1,4 V
106
Hundreds digit: Sensitivity adjustment, changes the
speed with which the asymmetry is being recognized.
= 0: fast recognition (but higher risk of errors,
i.e. unreliable stopping).
= 1: normal recognition (@ 0.5 sec.), pretty save
results (default).
= 2: slow recognition (@ 1 sec.), very reliable.
#29,
#124,
#112
Individual bits in these
CVs are responsible for
the correct reaction to
“DC” and “Märklin”
brake sections.
-
-
Set the following CVs for
polarity dependent DC brake
sections:
CV #29, Bit 2 = 0 and CV #124, Bit 5 = 1.
For polarity independent brake sections
(“Märklin-
Br
ake sections”)
set
CV #29, Bit 2 = 0 and CV #124 , Bit 5 = 1 and
additionally CV #112, Bit 6 = 1.
#124
Shunting key
functions:
Low gear (half speed)
and
Momentum reduction
or deactivation
NOTE:
Extended shunting key
selection in
CV’s #155, 156
Bits
0 - 4, 6
0
Select a function key for
LOW GEAR ACTIVATION:
Bit 4 = 1 (and Bit 3 = 0): F3 as half-speed key
Bit 3 = 1 (and Bit 4 = 0): F7 as half-speed key
Select a function key for
MOMENTUM DEACTIVATION:
Bit 2 = 0 (and Bit 6 = 0): “MN” key for deactivation,
Bit 2 = 1 (and Bit 6 = 0): F4 key for deactivation
Bit 6 = 1 (Bit 2 is irrelevant): F3 for deactivation.
Effect of above key (MN, F3 or F4) on
MOMENTUM:
Bit 1, 0 = 00: no effect on momentum
= 01: removes momentum of
CV #121 + #122
= 10: CV #3 + #4 reduced to ¼.
= 11: removes all momentum above.
#155
Selecting a function key
as half-speed key
0 - 19
0
Expanding on the settings of CV #124, if another key is
required than F3 or F7.
Consult the loco decoder manual for more information.
#156
Selecting a function key
for deactivating
momentum
0 - 19
0
Expanding on the settings of CV #124, if another key
than F3, F4 or MAN is required for momentum deactiva-
tion.
Consult the loco decoder manual for more information.
#157
Selecting a function key
for the
MAN function
Only for non-ZIMO
systems, which
don’t
have the MN key.
0 - 19
0
The MAN function (or MAN key on ZIMO cabs) was
originally designed for ZIMO applications only, in order
to cancel stop and speed limit commands applied by the
signal controlled speed influence system (HLU).
This function was expanded in later software versions to
in
clude “asymmetrical DCC signal stops” (Lenz ABC).
If ZIMO decoders are used with non-ZIMO systems, a
function key can now be assigned with CV #157 to can-
cel a signal controlled speed limit or stop command.
