Operation
4-6
4.5
Crosspoint display
If the displayed setup is modified by trigger or IEEE-488
commands, the crosspoint display changes automatically. If
editing a setup, changes to its source do not appear.
CAUTION
When changing setups, use caution
when the COPY key is enabled (the cor-
responding COPY LED will be lit). In-
advertent connections may be copied to
the relays causing instrument damage.
4.5.1 Modifying
After choosing the source of the setup, a crosspoint display
can be modified by turning on/off crosspoint LEDs with the
light pen. If the COPY indicator is lit, these actions open or
close relays immediately.
The maximum valid column number with a single unit is 12.
If several mainframes are connected and programmed for
master/slave operation, the maximum column can be up to
60 (with five units).
Figure 4-4
Light pen
The optional light pen can also be used to turn on and off
crosspoint LEDs. Hold the light pen perpendicular to the
front panel overlay at the desired LED and press the button
on its barrel. This action toggles the state of the LED.
The maximum number of simultaneously closed crosspoints
depends on the specified drive current per crosspoint of each
card. The total relay drive current required per mainframe
cannot exceed 5A.
4.5.2 Copying
The setup data displayed on the crosspoint LEDs can be
stored in the non-volatile memory of the Model 708A or can
be sent directly to the relays by pressing the COPY key or by
sending a device-dependent command (DDC). See para-
graph 5.9.25 for more information.
With the DDC, the displayed crosspoint configuration is
stored at the setup location specified when issuing the com-
mand. It overwrites the present setup data at that location. An
invalid input error occurs if you try to copy to a setup loca-
tion below one or above 100.
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Summary of Contents for 708A
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