R&S SMJ100A, Руководство по эксплуатации

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Remote Control Basics
R&S
®
SMJ100A
442 Operating Manual 1403.7458.32 ─ 14
VISA library
Instrument access via VXI-11 protocols is usually achieved from high level program-
ming platforms using VISA as an intermediate abstraction layer. VISA encapsulates
the low level VXI or GPIB function calls and thus makes the transport interface trans-
parent for the user. See
Chapter 6.1.1, "VISA Libraries" , on page 440 for details.
IP address
Only the IP address or the computer name (LAN device name) is required to set up the
connection. The IP address/computer name is part of the "visa resource string" used
by the programs to identify and control the instrument.
Forms of the VISA resource string:
TCPIP::host address[::LAN device name][::INSTR]
or
TCPIP::host address::port::SOCKET
where
●
TCPIP designates the network protocol used
●
host address is the IP address or host name of the device
●
LAN device name defines the protocol and the instance number of a sub-instru-
ment:
–
inst0
selects the VXI-11 protocol (optional, default)
–
hislip0
selects the newer HiSLIP protocol
●
INSTR indicates the instrument resource class (optional)
●
port determines the used port number
●
SOCKET indicates the raw network socket resource class
Example:
●
Instrument has the IP address 192.1.2.3 ; the valid resource string using VXI-11
protocol is:
TCPIP::192.1.2.3::INSTR
●
The DNS host name name is RSSM1 ; the valid resource string is:
TCPIP::RSSM1::hislip0
(HiSLIP)
TCPIP::RSSM1::INSTR
(VXI-11)
●
A raw socket connection can be established using:
TCPIP::192.1.2.3::5025::SOCKET
Identifying instruments in a network
If several instruments are connected to the network, each instrument has its own IP
address and associated resource string. The controller identifies these instruments by
the resource string.
Remote Control Interfaces and Protocols