18. Pin configurations
18.1 About General Purpose Inputs & Outputs (GPIO)
The Barco Cinema Controller and the Barco ICMP are equipped with GP IO ports. The electrical specifications
described in this chapter are the sam e for both GPIO ports.
General Purpose inputs
The B arco Cinema Controller and the Barco ICMP have each eight (8) opto-isolated general purpose inputs available. These inputs
are used to trigger the execution of mac ro fi les. For more explanation about the association of a macro to a GPI, consult the us er
guide of the Comm unicator.
Input voltage
The inputs can be directly driven from a TTL or CM OS output.
• The shape of the pulse must be rectangular.
• The duration of the pulse must be at least 5 0 milliseconds (shorter pu lses are considered as a s witch bounce)
• Minimum voltage : V
min
=3,3V
• Maximum voltage : V
max
=24V
External power supply
When interfacing with contact closure outputs, an ex ternal 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
+24V
10k
820R
GPIn P
GPIn N
4.7V
Input to projector Internal projector
1k1
+5V
to
+24V
Image 18-1
Cables
When long cable connections are required the use of shielded cables with twisted pairs is recomm ended. One twisted pair is to be
assigned to each GP Input pair.
How to make the connection
When the power supply used to pro vide the DC voltage
is isolated from ground (for example in the case of a n AC adapter) it is
recommended that the minus pole of that power s upply is connec ted to ground (or to t he projector chassis). T his will avoid high
common mode voltages at the projector G P Inputs. If that same power supply is used for other parts of the system, take care not to
create ground loops. In any case when shielded
cables are used that shield should be connected to the projector chassis.
General Purpose outputs
The Barco Cinema Controller and the B arco ICMP have each eight (8) opto-isolated outputs available. Four (4) of the outputs on
the Cinema Controller are ded icated for TI. The other general purpose outputs can be controlled via software.
About an output
The output c an generate a falling edge, rising edge, toggle or c ontinuous toggle.
• Generate Falling Edge – generate a falling edge on the external G PO port if the present state of the output is high. If the
present state of the external GP O is low, no edge will be generated.
• Generate Rising Edge – gen erate a rising edge on the external GP O p ort if the present s tate of the output is low. If the present
state of the external GPO is high, no edge will be gene rated.
• Generate Toggle – generate a toggle on the external GPO port. If the present state of the ou tput is low, a rising edge will be
generated, followed by a falling edge. If the present state of the output is high, a falling edge will be gener ated, followed b y a
rising edge. P u lse width = 20 milliseconds.
• Generate Continuous Toggle - This comm and w ill generate a continuous toggle of the external G P O por t. This toggle will
continue u ntil a G enerate Falling Edge, Generate Rising Edge,orG enerate Toggle command is received. The rate of toggle is
24Hz. .
146
R5906693 DP2K-E SERIES 19/06/2015
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