222 34980A User’s Guide
8 Microwave Switch/Attenuator Driver
SYSTem:PRESet, *RST, SYSTem:CPON and Power On
These actions drive the channels to their defined DEFault state (using the
configuration stored on the remote module) and force the system to
recognize new topologies (caused by power or connectivity changes).
These actions set the defaults shown in the table on page 221.
Two parameters are controllable to ensure safety of operation in the
system; the default state for channel closure and the default state for
drive enabled.
The default channel state (open or closed) for each channel can be set
using either of the following commands.
ROUTe:CHANnel:DRIVe:CLOSe:DEFault
ROUTe:CHANnel:DRIVe:OPEN:DEFault
The drive state can be set as a default using the
ROUTe:RMODule:DRIVe:SOURce:BOOT command. This command allows you
to specify whether the drive current, when present, should be applied to
the switches or not. You can set OFF, INTernal, and EXTernal for the
default.
The
*RST command forces a re- evaluation of all connected remote
modules, followed by setting all channels to their default states.
The system connections and drive states. This is very similar in
operation to what occurs at power- up. The
SYSTem:CPON command
performs a reset operation on a 34945A in single slot. *RST resets all
modules in the mainframe.
NOTE
If a channel is configured for a single drive in pulsed mode, OPEN
operations are undefined. When these channels are configured to a
default state of
OPEN, no action is taken on these channels.
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