Matrix Vision mvBlueLYNX-X, Техническое руководство, Страница: 42 / 236

Figure 13: Bridge circuit between Pin 2 and Pin 10
8.3.1.2.3 Example circuit 2: High-side switch uses external (higher) power supply
Following figure shows, how to connect, for example, high power flash LEDs in series at the direct drive
output at Pin 3:
Figure 14: LEDs connected in series to Pin 3 powered externally via Pin 10
A 24 V power supply is connected at Pin 10. To protect the LEDs a series resistor is needed, which can be
calculated in this way:
Voltage
: U
HS
- (n * U
F
) = U
D
Series resistor : R = U
D
/ 0.7 A
Power : P = dutycycle * U
D
* I
The duty cycle is a coefficient < 1, which defines the power of the resistor. It is the ratio of the time period
while current flows compared to the total time. If the current always flows,
P = U * I
will be the
determining factor. If the current only flows a hundredth of time (duty cycle 1%), a resistor with a hundredth
of power will be enough.
For the connected LEDs and the ground of the external power supply, you have to use the ground of the
camera at Pin 1.
The series resistor has to handle the power, which depends on the duty cycle and the frequency.
8.3.1.3 Using the serial port
The external serial port appears as a Linux standard device with the name
/dev/ttyO0
. It may be
programmed using usual Linux methods like the termios library. The port has no hardware handshake and
may be used with baudrates of up to at least 115200 baud.
The name of the serial port is
/dev/ttyO0
(character O, digit 0).
8.3.2 Circular connector female (VGA / USB)
mvBlueLYNX-X Technical Manual
32 22 April 2016 Version - 1.49 MATRIX VISION GmbH