A. Technical specifications
• The shape of the pulse must be rectangular.
• The duration of the pulse must be at least 50 milliseconds (shorter pulses are considered as a switch
bounce)
• Minimum voltage : V
min
=+5V
• Maximum voltage : V
max
= +18V
External power supply
When interfacing with contact closure outputs, an external power supply needs to be provided. Depending
upon the configuration a suitable pull-up resistor needs to be added as well.
10k
820R
GPIn P
GPIn N
4.7V
Input to projector Internal projector
1k1
+5V
to
+18V
10k
820R
GPIn P
GPIn N
4.7V
Input to projector Internal projector
1k1
+5V
to
+18V
Image A -1
Cables
When long cable connections are required the use of shielded cables with twisted pairs is recommended.
One twisted pair is to be assigned to each GP Input pair.
How to make the connection
When the power supply used to provide the DC voltage is isolated from ground (for example in the case
of an AC adapter) it is recommended that the minus pole of that power supply is connected to ground (or
to the projector chassis). This will avoid high common mode voltages at the projector GP Inputs. If that
same power supply is used for other parts of the system, take care not t
o create ground loops. In any
case when shielded cables are used that shield should be connected to the projector chassis.
General Purpose ou tputs
The Barco Cinema Controller and the Barco ICMP have each eight (8) opto-isolated outputs available.
Four (4) of the outputs on the Cinema Controller are dedicated for TI. The other general purpose outputs
can be controlled via software.
About an output
The output can generate a falling edge, rising edge, toggle or continuous toggle.
• Generate Falling Edge – generate a falling edge on the external GPO port if the present state of the
output is high. If the present state of the external GPO is low, no edge will be generated.
• Generate Rising Edge – generate a rising edge on the external GPO port if the present state of the
output is low. If the present state of the external GPO is high, no edge will be generated.
• Generate Toggle – generate a toggle on the external GPO port. If the present state of the output is
low, a rising edge will be generated, follo
wed by a falling edge. If the present state of the output is
high, a falling edge will be generated, followed by a rising edge. Pulse width = 20 milliseconds.
• Generate Continuous Toggle - This command will generate a continuous toggle of the external GPO
port. This toggle will continue until a Generate Falling Edge, Generate Rising Edge,orGenerate
Toggle command is received. The rate of toggle is 24Hz. .
Output transistor
• Maximum output driving voltage : V
max
=18V
• Maximum current : I
max
=30mA
• Maximum power dissipation : 120 mW
R5905722 ICMP 09/11/2016
39