Function-Decoders MX681, MX685, MX686, MX687, MX688 Page 13
and
FO3, FO4 as direction
bit mapping
and
Bit 6,
Bit 7
0
0
Bit 3 - function output FO10,
Bit 4 - function output FO11,
Bit 5 - function output FO12.
Bit 6 = 0
: „normal“
= 1:
“Direction bit” at FO3 and FO4 that is,
FO3 is switched on when driving in reverse,
FO4 is switched on when driving forward
(normal mapping of FO3 and FO4 is invalid
when this Bit is set).
Low/high beam with the help of the low beam mask
One of the two function keys F6 (CV #119) or F7 (CV #120) can be defined as a low beam key. Spe-
cific function outputs can be dimmed whit the output turned ON or OFF (inverted action with Bit 7).
CV
Denomination
Range
Default
Description
#119
Low beam mask for F6
-
Output assignment for
(example) low/high
beam
headlights
ATTENTION:
Certain settings in
CV #154 (Special output
configurations) change
the meaning of CVs
#119 and #120 and
therefore will no longer
work as a low-beam
mask.
Bits
0 - 7
0
Selected function outputs will dim with F6 key, accord-
ing to the dim value in CV #60.
Typical application: Low/high beam
Bit 0 - front headlight,
Bit 1 - rear headlight,
Bit 2 - function output FO1,
Bit 3 - function output FO2,
Bit 4 - function output FO3,
Bit 5 - function output FO4.
Bit value = 0: Output will not be dimmed,
Bit value = 1: Output will be dimmed with F6 to value
defined in CV #60.
Bit 7 = 0: normal action of F6.
= 1: inverted action of F6.
EXAMPLE:
CV #119 = 131: Function key F6 toggles headlights
between low and high beam.
#120
Low beam mask for F7
Bits 0 - 7
Same as CV #119 but with F7 as low beam key.
A “second dim value” with the help of the uncoupler- CV
If more function outputs need to be dimmed than CV #60 allows or if some function outputs require a
different voltage and the uncoupler function is not needed on the same vehicle then
CV #115
can be used for an alternative low voltage supply. The respective function outputs must be defined as
“uncoupler output” in the corresponding
CV
s #125…#132, #159 and #160
(see “Special effects for function outputs).
CV
Denomination
Range
Default
Description
#115
Uncoupler control
or
Second dim value
0 - 9
0
Only activ
e as uncoupler if “uncoupler” function is se-
lected (value 48) in CV #125 …132, 159 or 160:
Tens digit = 0: used for dimming.
Ones digit (0 to 9): PWM
– voltage reduction
(0 to 90%)
#127
-
#132
#159
#160
Effects on
FO1, FO2,
FO3, FO4, FO5, FO6
on FO7
on FO8
0
0
#127
FO1 #128
FO2
#129
FO3 #130
FO4
#131
FO5 #132
FO6
#159
FO7 #160
FO8
3.12 The Flasher Effect
Flashing is actually a lighting effect just like all the others that are summarized in the CVs starting with
#125; but for historical reasons are listed in their own CVs #117 and #118.
CV
Denomination
Range
Default
Description
#117
Flasher functions
Outputs are assigned in
CV #118.
0 - 99
0
Duty cycle for flasher function:
Tens digit = OFF time
Ones digit = ON time
(0 = 100msec, 1 = 200msec…..9 = 1 sec)
Example:
CV #117 = 55: Flashes evenly at 1 a second interval.
#118
Flashing mask
-
Defines which outputs
operate as flashers as
programmed in CV #117
Bits
0 - 7
0
Selected function outputs will flash when turned ON.
Bit 0 - front headlights
Bit 1 - rear headlights
Bit 2 - function output FO1, Bit 3 -
…FO2
Bit 4 -
…FO3, Bit 5 - function output FO4.
Bit value = 0: No flasher
Bit value = 1: Output flashes when turned ON.
Bit 6 = 1: FO2 flashes inverse!
Bit 7 = 1: FO4 flashes inverse!
(for alternate flashing, i.e. wig-wag)
EXAMPLE:
CV #118 = 12: FO1 and FO2 are defined as flashers.
CV #118 = 168: Alternate flashing of FO2 and FO4
