Annexes
R&S
®
ZNB/ZNBT
1254
User Manual 1173.9163.02 ─ 38
Trigger cables
Be aware that long trigger cables may cause signal reflections. Notice the instruction in
Chapter 3.1.5, "EMI Suppression"
10.2.2 LAN Interface
To be integrated in a LAN, the instrument is equipped with a LAN interface, consisting
of a RJ-45 connector, a network interface card and protocols. The network interface
card supports IEEE 802.3 for a 10 Mbps Ethernet and IEEE 802.3u for a 100 Mbps
Ethernet.
Instrument access is possible via the VXI-11 protocol. It is usually achieved from high
level programming platforms by using the Virtual Instrument Software Architecture
(VISA) library as an intermediate abstraction layer. VISA encapsulates the low level
function calls and thus makes the transport interface transparent for the user. See also
Chapter 6.1, "Introduction to Remote Control"
10.2.2.1
VXI-11 Interface Messages
The following VXI-11 interface messages (also termed low-level control messages) are
also supported by the GPIB Explorer.
Command
Meaning
Effect on the instrument
@DCL
Device Clear
Aborts the processing of the commands just received and sets
the command processing software to a defined initial state.
Does not change the instrument settings.
@GET
Group Execute
Trigger
Triggers the active measurement sequence (e.g. a sweep).
The effect of the command is the same as with that of a pulse
at the external trigger signal input.
@LOC
Go to Local
Transition to the "local" state (manual control).
@REM
Go to Remote
Transition to the "remote" state (remote control).
10.2.3 GPIB Interface
The R&S
ZNB/ZNBT can be equipped with a GPIB (IEC/IEEE) bus interface (option
R&S
ZNB/ZNBT-B10. The interface connector labeled "GPIB" is located on the rear
panel of the instrument. The GPIB bus interface is intended for remote control of the
R&S
ZNB/ZNBT from a controller.
To be compliant with EMC regulations open IEEE cables should be avoided. IEEE
cables must be connected on both sides.
Characteristics of the interface
●
8-bit parallel data transfer
Interfaces and Connectors
