Remote Control Basics
R&S
®
NRPxxT(N)
134
User Manual 1177.6023.02 ─ 08
For details of the VXI-11 protocol, refer to
Chapter 11.1.2.2, "VXI-11 Protocol"
Socket Communication
TCPIP::<IP address or hostname>
::port::SOCKET
●
port
determines the used port number
●
SOCKET
indicates the raw network socket resource class
Socket communication requires the specification of the port (commonly referred to as
port number) and of "SOCKET" to complete the VISA resource string with the associ-
ated protocol used.
The default port for socket communication is port 5025.
For details of the socket communication, refer to
Chapter 11.1.2.4, "Socket Communi-
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 host name is
nrp18tn-100001
; the valid resource string is:
TCPIP::nrp18tn-100001::hislip0 (HiSLIP)
TCPIP::nrp18tn-100001::inst0 (VXI-11)
A raw socket connection can be established using:
TCPIP::10.111.11.20::5025::SOCKET
TCPIP::nrp18tn-100001::5025::SOCKET
11.1.2.2
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 proto-
col, messages cannot be lost.
11.1.2.3
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
Remote Control Interfaces and Protocols
