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150 L4400 User’s Guide
7 Microwave Switch/Attenuator Driver
Switch state is stored in the instrument. In contrast, the ROUTe:OPEN? and
ROUTe:CLOSe queries always check the actual hardware state of the switch for
verified channels.
For paired operations on the L4445A (using the
ROUTe:CHANnel:DRIVe:PAIRed:MODE command), when you enable
verification on either paired channel verification will be enabled on both
channels. In addition, the module checks for complementary position
indicators on the lower and upper channels of the pair (i.e., the position
indicators should indicate opposite states). If the state of the lower and upper
position indicators are found to be in the same state (due to a hardware issue),
an error is generated and the state of the lower channel is assumed.
When the paired mode is disabled and pulsed mode is enabled, you cannot
query the open/closed state of the associated channels unless verification is
enabled. While in this mode (single drive operation), only “close” operations
are allowed on the channels (“open” operations are not allowed). In this mode,
a close operation provides a single pulse on the specified channel.
If you enable verification on a non-paired (single drive), non- pulsed
(continuous drive) channel on the L4445A, the
ROUTe:CLOSe? and
ROUTe:OPEN? commands return the state of the verified device, rather than the
drive state of the specified channel. It is possible to have such a channel being
driven via a ROUTe:CLOSe command by the channel position indicators show
the channel as open. In these cases, use the
ROUTe:CHANnel:VERify:POSition:STATe? command to determine exactly
which channels are currently being driven.
The
ROUTe:CHANnel:VERify:POLarity command sets the logic polarity of the
verification lines on specific channels. You can specify the polarity as NORMal
(active high) or INVerted (active low).
If you have not enabled verification, you can still query the indicator state of a
specific channel using the
ROUTe:CHANnel:VERify:POSition:STATe?
command. This command is useful for channels on which verification is
disabled for activities such as debugging or when verification is disabled for
performance reasons.