Protocol; Socket Communication - R&S SGT100A User Manual

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R&S SGT100A
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 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 device handshake returns.
However, using HiSLIP, data is sent to the device using the "fire and forget" method
with immediate return. Thus, a successful return of a VISA operation such as
viWrite() does not guarantee that the instrument has finished or started the reques-
ted command, but is delivered to the TCP/IP buffers.
For more information see also the application note:
1MA208: Fast Remote Instrument Control with HiSLIP
10.1.2.3 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.
10.1.2.4

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 ─ 07
Network and Remote Control Operation
Remote Control Interfaces and Protocols
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