Vidia-Discrete
Computer Control • 25
See “Programming for the Vidia-Discrete” on page 26 for more
information on using the RS-232 interface.
Setting the Baud Rate for RS-232
The RS-232 interface works at baud rates of 300, 1200, 2400, 4800,
9600, or 19200.
1. On the front panel, press and hold the
Local
button and hold down
the
GPIB/RS232
switch.
2. Turn the
Wavelength Adjust
knob to change the baud-rate setting.
3. Release the
Local
button and the
GPIB/RS232
switch.
Restoring Local (Front-Panel) Control
Commands sent over the IEEE (GPIB) or RS-232 interface will switch
the laser into remote mode and disable most of the front-panel
controls. This remote-control mode is indicated by the “Remote” LED
on the front panel of the laser.
To return the controller to local (front-panel) control, press the
Local
button on the front panel.
Understanding the Command Types
There are three types of commands understood by the laser controller:
Set commands, Query commands, and Sense commands.
•
Use Set commands to set or change a value. Examples would be
commands that turn on the laser or set the operating power.
•
Use Query commands to check the user- or factory- set values of
the laser. Examples include checking the set value for the power
and checking the start wavelength for scans.
•
Use Sense commands to determine the actual values for the laser
properties at any given time. For example, to check the actual
operating current or the voltage from the
Detector Input
.
64X7 rev E.fm Page 25 Tuesday, April 3, 2001 4:16 PM
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