Annexes
R&S
®
ZNC
739
User Manual 1173.9557.02 ─ 13
9.1.2 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
"Introduction to Remote Control"
9.1.2.1
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).
9.1.3 GPIB Interface
The R&S ZNC can be equipped with a GPIB (IEC/IEEE) bus interface (option R&S ZNC-
B10. The interface connector labeled "GPIB" is located on the rear panel of the instru-
ment. The GPIB bus interface is intended for remote control of the R&S ZNC 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
●
Bidirectional data transfer
●
Three-line handshake
●
High data transfer rate of max. 1 MByte/s
●
Up to 15 devices can be connected
●
Maximum length of the connecting cables 15 m. The length of a single connecting
cable should not exceed 2 m, if many devices are used, it should not exceed 1 m.
Interfaces and Connectors