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B. Pin configurations
B.1 About General Purpose Inputs & Outputs (GPIO)
General Purpose inputs
Eight (8) opto-isolated general purpose inputs are available. These inputs are used to trigger the execution of macro files. For more
explanation about the association of a macro to a GPI, consult the user guide of the Communicator touch panel.
Input voltage
The inputs can be directly driven from a TTL or CMOS output.
•
The shape of the pulse must be rectangular.
•
The duration of the pulse must be at least 1.6 milliseconds (shorter pulses are considered as a switch bounce)
•
Minimum voltage : V
•
Maximum voltage : V
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.
Input to projector
+3.3V
to
+24V
Image B-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 to
create ground loops. In any case when shielded cables are used that shield should be connected to the projector chassis.
General Purpose outputs
Eight (8) opto-isolated outputs are available, where four 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, followed by a falling edge. If the present state of the output is high, a falling edge will be generated, followed by a
rising edge. The rate of toggle will be the vertical sync rate (edge transition at each vsync). 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, or Generate Toggle command is received. The rate of toggle is
24Hz. .
Output transistor
•
Maximum output driving voltage : V
•
Maximum current : I
•
Maximum power dissipation : 120 mW
138
= 3,3 V
min
= 24 V
max
Internal projector
GPIn P
GPIn P
100R
1k1
10k
GPIn N
GPIn N
= 70 V
max
= 30 mA
max
Input to projector
Internal projector
GPIn P
GPIn P
+3.3V
to
+24V
1k1
GPIn N
GPIn N
R5977692 DP2K-S SERIES 10/12/2012
100R
10k
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