R&S ZVL
Interfaces and Connectors
Rear Panel Connectors
Operating Manual 1303.6580.32-05
592
channel. Instrument control is mainly performed on the core channel (program, response and low–level
control messages). The abort channel is used for immediate abort of the core channel; the interrupt
channel transmits spontaneous service requests of the instrument. Link setup itself is very complex. For
more details refer to the VXI–11 specification.
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.
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.
