R&S
®
ZVA/ZVB/ZVT Remote Control: Introduction
1145.1084.12 5.7 E-1
Return to Manual Operation
Return to manual operation can be initiated via the front panel or via remote control.
• Manually: Press the Local softkey in the remote screen.
• Via GPIB bus: CALL IBLOC(device%)
• Via RSIB or VX 11 interface: @LOC and @REM can be used to switch from remote to manual
control and back.
Local lockout
Before returning to manual control, command processing must be completed. If this is not the case, the
analyzer switches back to remote control immediately.
Returning to manual control by pressing the Local softkey can be disabled by the GPIB Local Lockout
Message (LLO; see GPIB Bus Interface, Universal Commands) which is also included in the NI
commands SetRWLS (Set Remote With Lockout State) or SendLLO. This prevents unintentional
switch-over, i.e. return to manual control is possible via the GPIB bus only.
Returning to manual control via the front panel keys can be enabled again by deactivating the REN
control line of the GPIB bus .
Messages
The messages transferred on the data lines of the GPIB bus or via the RSIB interface can be either
interface messages or device messages.
GPIB Bus Interface Messages
Interface messages are transferred on the data lines of the GPIB bus, the ATN control line being active.
They are used for communication between controller and instrument and can only be sent by a
computer which has the function of an GPIB bus controller.
Interface messages can be further subdivided into
• Universal commands act on all devices connected to the GPIB bus without previous
addressing.
• Addressed commands only act on devices previously addressed as listeners.
The interface messages relevant to the instrument are listed in the GPIB bus section.
RSIB Interface Messages
The RSIB interface allows the instrument to be controlled in a Local Area Network. The interface
functions are matched to the function interface for GPIB bus programming from National Instruments.
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