Page 28 Non-Sound Decoder MX618 - MX634 and Sound Decoder MX640 - MX648
3.18
The ZIMO “Input Mapping”
(ONLY for sound decoders)
SW versions 34 and up, also for function outputs via SUSI!
The NMRA function mapping limitations (only one of 8 functions per function key) can be overcome
with the ZIMO “input mapping”. In addition, the function keys (=
external functions)
can quickly be
adapted to the wishes of the operator and that for both, function outputs and sound functions, without
the need of changing the
internally mapped functions
and especially without changes to the sound
projects:
CV’s #400 …
428
CV
Designation
Range
Default
Description
#400
Input mapping
for internal
F0
that is, which function
key switches the internal
(decoder) function F0.
0,
1 - 28, 29
30
– 187.
254, 255
0
= 0: Key F0 (that is, F0 received from the DCC-packet)
is sent to the internal (decoder) F0 (1:1).
= 1: Key F1 is sent to the internal F0.
…..
= 28: Key F28 is sent to the internal F0.
= 29: Key F0 is sent to the internal F0.
= 30: Key F1 to F0, only in forward direction.
…..
= 57: Key F28 to F0, only in forward direction.
= 58: Key F0 to F0, only in forward direction.
= 59: Key F1 to F0, only in reverse direction.
…..
= 86: Key F28 to F0, only in reverse direction.
= 87: Key F0 to F0, only in reverse direction.
= 101: Key F1-inverted to internal F0
…..
= 187: Key F0- inverted to internal F0, in reverse dir.
= 254: Directions Bit to internal F0, in forward dir.
= 255: Directions Bit to internal F0, in reverse dir.
#401
-
#428
Input mapping
for internal
F1 … F28
0,
1 - 28, 29,
30 - 255
0
Same as input mapping above for other functions:
CV #401 = 0: Key F1 to internal F1
= 1: Key F1 to internal F1
= 2: Key F2 to internal F1 and so on.
3.19 Dimming, Low beam and Direction Bits
Some things connected to function outputs may sometimes require less than full track voltage, as is
the case for example with 18V bulbs and 24V on the track (quite common on large scale model rail-
roads). Other times you simply want to reduce the brightness of the headlights.
The best solution in such cases is to connect the positive side of such devices to the low voltage sup-
ply of the decoder (see chapter “Installation and wiring”). These outputs are fully stabilized so the
voltage does not fluctuate with changes in track voltage.
Alternatively or in addition to this, the PWM voltage reduction is also available with
CV #60,
which defines the PWM duty cycle (Pulse With Modulation; the dimming is also effective when con-
nected to the positive terminal of a low-voltage function output). Of course, this kind of voltage reduc-
tion is interesting because it is easy to change at any time by changing the value in CV #60.
NOTE: Bulbs with voltage ratings as low as 12V can be dimmed with this PWM dimming function with-
out damage even if track voltages are considerably higher; but
not
bulbs rated below that such as 5V or
1.2V bulbs. These must be connected to one of the decoder’s low voltage supply pins instead of a
“normal” positive pin (see chapter “Installation and Wiring”).
LED’s, on the other hand, always require a series resistor; if however, a resistor is selected that lowers
the voltage to 5 V, the PWM dimming can also be used even at a track voltage of 25V (in this case the
setting would be CV #60 = 50, so a reduction to one fifth).
CV #60 affects all function outputs but specific outputs can be excluded from the dimming function,
us
ing the dim mask CV’s (see table).
CV
Designation
Range
Default
Description
#60
Reduced function output
voltage
(Dimming).
Affects all
function outputs.
0 - 255
0
Reduction of function output voltage with PWM (pulse-
with modulation). Useful for headlight dimming for ex-
ample.
Example values:
CV #60 = 0 or 255: full voltage
CV #60 = 170: 2/3 of full voltage.
CV #60 = 204: 80% of full voltage.
#114
Dim Mask 1
=
Excludes certain
function outputs from
dimming per CV #60.
For higher function
outputs go to
CV #152.
Bits
0 - 7
0
Enter function outputs that are
not
to be
dimmed
by
CV #60. These outputs will receive the full voltage
from the pin they are connected to that is, either full
track voltage or low voltage from a low-voltage pin.
Bit 0 - front headlight,
Bit 1 - rear headlight,
Bit 2 - function output FO1, Bit 3 - FO2,
Bit 4 - function output FO3, Bit 5 - FO4
Bit 6 - function output FO5, Bit 7 - FO6
Respective Bit = 0: Output will be dimmed to the value
defined in CV #60.
Respective Bit = 1: Output will not be dimmed.
EXAMPLE:
CV #114 = 60: FO1, FO2, FO3 and FO4 will not be
dimmed; front and rear headlights will be dimmed ac-
cording to CV #60.
#152
Dim Mask 2
(Excludes specific func-
tion outputs from dim-
ming as per CV #60)
Continuation of
CV #114
and
FO3, FO4 as direction
bit mapping
Bits
0 - 5
and
Bit 6,
Bit 7
0
0
… Continuation of CV #114.
Bit 0 - function output FO7,
Bit 1 - function output FO8,
Bit 2 - function output FO9,
Bit 3 - function output FO10,
Bit 4 - function output FO11,
Bit 5 - function output FO12.
Bit 6 = 0:
“normal“
= 1:
“Direction bit” to FO3 and FO4 that is,
FO3 is switched on when driving in reverse,
FO4 when driving forward (normal mapping
for FO3 and FO4 is cancelled).
Bit 7 = 1: “Direction bit” for FO9 in Fwd direction.
