Vidia-Discrete
Computer Control • 23
Computer Control
Introduction
The Vidia-Discrete can be operated remotely through either the parallel
IEEE-488 (GPIB) interface or the serial RS-232 interface. Most
computers have RS-232 interfaces built in. In order to use the IEEE-488
interface, a special card or interface box is necessary. The IEEE-488
interface is many times faster than the RS-232 interface and can be
used to communicate with up to 30 instruments at the same time. RS-
232 is limited to communication with one instrument at a time.
Upon receiving a command over the computer interface, the front-
panel functions are locked out. Use the
Local
button on the front panel
to re-enable the front panel. All front-panel operations are available
through computer control. In addition, several functions are unique to
computer control.
Before attempting to communicate with the instrument, you must set
the device address (for IEEE-488) or the baud rate (for RS-232) via the
front panel.
Using the IEEE-488 Interface
The IEEE interface, also known as the General-Purpose Interface Bus or
GPIB, is a standard interface used for personal computers to
communicate with laboratory instruments. Several manufacturers
make printed circuit board “cards” that plug into the computer,
allowing it to communicate over the IEEE interface. The card’s
manufacturer can provide information for configuration with your
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