Experimetnal Control Systems
KVM Switch Software
To set the video input for the subject, open the NTVideoSwitch program by left clicking on the 'Start' menu at the bottom left of the screen and choosing 'Programs' and 'NTIVideoSwitcher'.
This software uses the serial port connection to communicate with the NTI VideoSwitcher box (located in the scanner equipment room). Use the NTIVideoSwitcher program to control which video input (computer display or DVD signal) goes to which video output device (monitors, goggle, or projector). When switching the computer monitors it also switches the keyboard and mouse that go with that monitor.
The software provides a matrix display with video inputs (CPUS) across the top and output devices (USERS) listed along the left side (see figure). To connect an input to an output you simply click on the appropriate box in the matrix. The 4 inputs on the 4T are:
- Input 1: Windows98 computer
- Input 2: Primary video output from WindowsXP computer
- Input 3: Second video output from WindowsXP computer
- Input 4: DVD player
The inputs on the 3T are:
- Input 1: Mach - Windows XP computer (on the left)
- Input 2: Donders - Windows XP computer (on the right)
- Input 3: DVD player
784951111/lib/exe/fetch.php?tok=ae46a7&media=http%3A%2F%2Fhawking.biac.duke.edu%2Fdocs%2Fcontrolsys%2Fgraphics%2Fvideoswitchcomp1.jpg" class="media" loading="lazy" title="hawking.biac.duke.edu_docs_controlsys_graphics_videoswitchcomp1.jpg" alt="hawking.biac.duke.edu_docs_controlsys_graphics_videoswitchcomp1.jpg" />It is a good idea to exit from this switching program after you have set the video connections, before running your stimulus control software. This is because the software used to control the switch can affect the timing and display properties of other programs when both are running at the same time.