Lectrosonics VI24 - Manual (Page 4)

REAR PANEL CONTROLS AND FUNCTIONS
LOGIC
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LOGIC OUTPUTS
On the rear of the VI24 is a male 25-pin D connector as is commonly used for computer interfaces. This is not a
serial, parallel or SCSI port, however. As the markings next to the connector show, one of the pins is ground, and the
others are the logic outputs, numbered 1 to 24. These are “open-drain” outputs: When the pin is “off”, there is no
connection to ground or to any other pin (it’s an open circuit). When the pin in “on”, it is shorted to ground. Thus, a
switch contact closure is electrically simulated.
Note: the popular “GPI” (General Purpose Interface) common to many popular video switchers requires exactly
these electrical characteristics. The output pins of the VI24 may be connected directly to GPI input pins.
INSTALLING THE SOFTWARE
The VI24 software requires Microsoft Windows 3.1, Windows For Workgroups, Windows 95 or Windows NT. You will
need approximately 4MB of available hard disk space to install the application. You will also need an available serial
port to connect to the VI24.
Insert the floppy and run SETUP.EXE. On Windows 3.1 and Windows For Workgroups, select “Run...” from the
Program Manager. On Windows 95 and NT, click the start menu, then select “Run...”. Type in x:\setup, where x is the
letter associated with your floppy disk drive (usually a).
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