ZIMO MS450, Instruction Manual

Page: 38 / 88

Page 38 MS - SOUND decoders MS440 to MS990 and MN - NON-SOUND decoders MN170 to MN340
The NMRA function mapping limitations (only one of 8 functions per one of the 12 function keys) can be
overcome with the
ZIMO “input mapping”. Additionally, 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:
CVs #400 - #428
CV Denomination Range Default Description
#400
Input mapping
for internal
F0
that is, which function
key switches the
internal (decoder) func-
tion F0.
0,
1 - 28, 29
30 - 187
254, 255
0
= 0: Key F0 (i.e. F0 from the DCC packet) is
sent to the internal 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: = 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 F1-inverted to internal F0, only in reverse
direction
= 254: Direction 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 #403 = 1: Key F1 is forwarded to F3
= 9: Key F9 is forwarded to F3, etc.
Some things connected to function outputs may sometimes require less than full track voltage, as is the
case for example with 18 V bulbs when having 24 V on the track (quite common on large scale model
railroads). 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 supply
of the decoder (see chapter “7 Installation and connection of the ZIMO decoder”). These outputs are
fully stabilized so the voltage does not fluctuate with changes in track voltage.
Alternatively, or additionally (the dimming does not only work if the load is connected to the positive
pole with full rail voltage, but also relative to a function low voltage) the voltage reduction via PWM
dimming (pulse width modulation) is available with
CV #60
which defines the PWM duty cycle. Of course, this kind of voltage reduction is interesting because it is
easy to change at any time by changing the value in CV #60.

LEDs, 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 25 V (in this case the
setting would be CV #60 = 50, so a reduction to one fifth).
Generally, CV #60 applies to all function outputs. Specific outputs can be excluded from the dimming
function, using the dimming mask CVs (see table).
CV Denomination Range Default Description
#60
Dimming the function
outputs =
voltage reduction of the
function outputs by
PWM
Generally, this affects all
function outputs.
0 - 255 0
Reduction of function output voltage with PWM (pulse
width modulation), to reduce the light’s brightness, for
example.
EXAMPLES:
CV #60 = 0 or 255: full voltage
CV #60 = 170: 2/3 of full voltage
CV #60 = 204: 80 percent of full voltage
#114
Dim Mask 1
=
Excludes specific func-
tion outputs from dim-
ming as per
CV #60
Also see
Addition 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 headlights
Bit 1 - rear headlights
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, if switched on, be
dimmed with voltage according to CV #60.
Respective Bit = 1: Output will, if switched on, not be
dimmed, i.e. it will be supplied with full voltage when
switched on.
EXAMPLE:
CV #114 = 60: FO1, FO2, FO3, FO4 will
not be
dimmed; i.e. only the headlights are reduced in bright-
ness.
#152
Dim Mask 2
Excludes specific func-
tion outputs from dim-
ming
Addition to
CV #114
and
FO3, FO4 as
Direction outputs
Bits
0 - 5
and
Bit 6,
Bit 7
0
0
... Addition to 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 bits on FO3, FO4, i.e.
FO3 is switched on when driving backwards,
FO4 is switched on when driving forward.
(for Märklin switch type C)
Bit 7 = 1: direction bit for FO9 when driving forward
ATTENTION : Bulbs with voltage ratings as low as 12 V can be dimmed with this PWM dimming
function without damage even if track voltages are considerably higher; but not bulbs rated below
that such as 5 V or 1.2 V bulbs. Those must be connected to one of the decoder
’s low voltage supply
pins instead of a “normal” positive pin.