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MX Control Card Configuration
Vicon MX Hardware System Reference A-7
Custom GPO Programming
To activate a custom program specifying how the Vicon system is to
interact with your third-party external device from the Vicon
software, you must create a .gpo configuration file. This file specifies
the characteristics of a synchronization signal through the GPIO
socket on the rear panel of the MX Control. For example,.gpo files
supplied with the Vicon Reference Video system option specify the
relationship of the frame rate of a connected reference video camera
with that of MX Cameras.
You can create .gpo files to send the following types of
synchronization signal:
GPO1: single frame synchronous signal that can trigger an arm or
a capture state
GPO2: repetitive pulse signal that starts on the first video capture
frame and stops on the last
This section describes how to create a .gpo file to activate the GPO
outputs that send the desired synchronization signals. For details on
how to specify your .gpo configuration file during motion capture, see
the documentation for your Vicon software.
GPO File Format
General Purpose Output (.gpo) configuration files are written in
eXtensible Markup Language (.xml) file format. These .xml files are
used to store structured information and to enclose or encapsulate
information so that it can be passed between different computing
systems. As in any .xml file, .gpo file sections are delimited with start
and end section tags, and subsections are nested beneath main
sections to reflect their hierarchical relationship, for example:
<XML header>
<SectionStart>
<SubsectionStart ATTRIBUTE="value">
<Keyword>Value</Keyword>
<Keyword ATTRIBUTE="value"/>
</SubsectionEnd>
</SectionEnd>
Important
The .gpo file can be viewed in most Web browsers or standard text editors
like any other .xml file. You may find it helpful to view one of the sample .gpo
files provided with your Vicon application software while you read this
appendix describing the general format and content of a .gpo file. This
MXhardware_Reference.book Page 7 Monday, April 30, 2007 1:56 PM
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