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07/2020
Corona II
– LED Line Scan Illumination
PMA_CHR_CD40069_R05_Manual_Corona-II_XLC4
111
6.5.3.2 Command mode (RS232, RS485 USB, Ethernet)
Parameter
Value
cuPar
.
WorkingMode
1
In this mode, the output current of the LED controller is switched and adjusted by commands.
The LEDs are switched on and off with the LC command.
The currents for the four channels are set by the IY command.
6.5.3.3 PWM-controlled mode
Parameter
Value
cuPar
.
WorkingMode
2
In this mode, the output currents of the LED controller are switched and adjusted by two
external opto-isolated input signals, ON and PWC. (For information about electrical properties,
see section 6.3.6.)
The LEDs are switched on with a High Level at input ON and switched off with a Low Level.
The currents for the 4 channels are controlled by the duty cycle of the PWC input.
PWC is a pulse-width-modulated signal. The duty cycle of PWC defines a current factor F
which is multiplied with the default channel current of each individual channel to set the
resulting output current.
F
channel
I
channel
I
default
=
)
(
)
(
The duty cycle
D
is defined as
T
t
D
P
=
Figure 6-13
The current factor
F
is given by
=
8
.
0
)
(
)
(
PWC
D
PWC
F
for
8
.
0
)
(
1
.
0
PWC
D
1
)
(
=
PWC
F
for
8
.
0
)
(
PWC
D
Figure 6-14