R&S NRQ6, Начало работы, Страница: 55 / 61

Remote Control Interfaces and Protocols
R&S
®
NRQ6
55 Getting Started 1178.3705.02 ─ 07
Example:
A power sensor has the IP address 10.111.11.20 ; the valid resource string using
VXI-11 protocol is:
TCPIP::10.111.11.20::INSTR
The DNS hostname is
nrq6-100001 ; the valid resource string is:
TCPIP::nrq6-100001::hislip0 (HiSLIP)
TCPIP::nrq6-100001::inst0 (VXI-11)
A raw socket connection can be established using:
TCPIP::10.111.11.20::5025::SOCKET
TCPIP::nrq6-100001::5025::SOCKET
7.2.2 VXI-11 Protocol
The VXI-11 standard is based on the ONC RPC (Open Network Computing
Remote Procedure Call) protocol which in turn relies on TCP/IP as the network/
transport layer. The TCP/IP network protocol and the associated network services
are preconfigured. TCP/IP ensures connection-oriented communication, where
the order of the exchanged messages is adhered to and interrupted links are
identified. With this protocol, messages cannot be lost.
7.2.3 HiSLIP Protocol
The HiSLIP (high-speed LAN instrument protocol) is the successor protocol for
VXI-11 for TCP-based instruments specified by the IVI foundation. The protocol
uses two TCP sockets for a single connection - the first for fast data transfer, the
second one for non-sequential control commands (e.g.
Device Clear
or
SRQ
).
HiSLIP has the following characteristics:
●
High performance as with raw socket network connections
●
Compatible IEEE 488.2 support for Message Exchange Protocol, Device
Clear, Serial Poll, Remote/Local, Trigger, and Service Request.
●
Uses a single IANA registered port (4880), which simplifies the configuration
of firewalls.
●
Supports simultaneous access of multiple users by providing versatile locking
mechanisms.
●
Usable for IPv6 or IPv4 networks.
Ethernet Interface