Pin Configurations; About General Purpose Inputs & Outputs (Gpio) - Barco DP2K-12C Installation Manual

A. PIN CONFIGURATIONS
Overview
• About General Purpose Inputs & Outputs (GPIO)
• Pin configurations of the communication ports
• Pin configurations of the inputs
A.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
+5V
to
+24V
GPIn N GPIn N
Image A-1
Left diagram: with pull-up resistor. Right diagram: without pull-up resistor.
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.
R5905050 DP2K C-SERIES 10/07/2012
= 3,3 V
min
= 24 V
max
Internal projector
GPIn P GPIn P
820R
10k
1k1
4.7V
Input to projector Internal projector
GPIn P GPIn P
+5V
to
+24V
1k1
GPIn N GPIn N
A. Pin configurations
820R
10k
4.7V
99