R&S
®
CMW 500 Annexes
Interfaces and Connectors
Operating Manual 1202.3986.32 – 03 416
VXI–11 channels between instrument and controller
The number of controllers that can address an instrument is practically unlimited in the
network. In the instrument, the individual controllers are clearly distinguished. This
distinction continues up to the application level in the controller, i.e. two applications on
a computer are identified by the instrument as two different controllers.
Remote control via LAN from several controllers
The controllers can lock and unlock the instrument for exclusive access. This regulates
access to the instrument of several controllers.
VXI-11 Interface Messages
On the Ethernet link, the interface messages are called low–level control messages.
These messages can be used to emulate interface messages of the IEC/IEEE bus.
Command Effect on the instrument
&ABO (Abort) Aborts processing of the commands just received.
&DCL (Device
Clear)
Aborts processing of the commands just received and sets the command
processing software to a defined initial state. Does not change the instrument
setting.
>L (Go to
Local)
Transition to the "Local" state (manual control).
>R (Go to
Remote)
Transition to the "Remote" state (remote control).
&GET (Group
Execute
Trigger)
Triggers a previously active device function (e.g. a sweep). The effect of the
command is the same as with that of a pulse at the external trigger signal input.
&LLO (Local Disables switchover from remote control to manual control by means of the front
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