Instrument control
R&S
®
SGT100A
57
Getting Started 1419.4576.02 ─ 10
uses two TCP sockets for a single connection - one for fast data transfer, the
other 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
Using VXI-11, each operation is blocked until a VXI-11 instrument hand-
shake returns. However, using HiSLIP, data is sent to the instrument using
the "fire and forget" method with immediate return. Thus, a successful return
of a VISA operation such as
viWrite()
guarantees only that the command
is delivered to the instrument's TCP/IP buffers. There is no confirmation,
that the instrument has started or finished the requested command.
For more information see also the application note:
1MA208: Fast Remote Instrument Control with HiSLIP
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.
Socket communication
An alternative way for remote control of the software is to establish a simple net-
work communication using sockets. The socket communication, also referred to
as “Raw Ethernet communication”, does not require a VISA installation on the
remote controller side.
Network operation and remote control
