Emerson R&S SGT100A User Manual page 318

®
R&S SGT100A
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 fire-
walls
●
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 handshake 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
9.1.2.3 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 proto-
col, messages cannot be lost.
9.1.2.4 Socket communication
An alternative way for remote control of the software is to establish a simple network
communication using sockets. The socket communication, also referred to as "Raw
Ethernet communication", does not require a VISA installation on the remote controller
side.
The simplest way to establish socket communication is to use the built-in telnet pro-
gram. The telnet program is part of every operating system and supports communica-
tion with the software on a command-by-command basis.
Socket connections are established on a specially defined port. The socket address is
a combination of the IP address or the host name of the instrument and the number of
the port configured for remote-control. All instruments use port number 5025 for this
purpose. The port is configured for communication on a command-to-command basis
and for remote control from a program running on a connected PC.
User Manual 1176.8674.02 ─ 12
Network operation and remote control
Remote control interfaces and protocols
318