Remote Control Basics
R&S
®
SMU200A
452Operating Manual 1007.9845.32 ─ 15
Example:
Instrument has the IP address 192.1.2.3; the valid resource string is:
TCPIP::192.1.2.3::INSTR
Computer name is RSSM1; the valid resource string is:
TCPIP::RSSM1::INSTR
Identifying instruments in a network
If several instruments are connected to the network, each instrument has its own IP
address and associated resource string. The controller identifies these instruments by
means of the resource string.
6.1.3.1 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.
6.1.3.2 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 as “Raw Ether-
net communication”, does not require a VISA installation on the remote controller side.
The simplest way to establish socket communication is to use the build-in telnet program.
The telnet program is part of every operating system and supports a communication with
the software on a command-by-command basis. For better utilization and to enable auto-
mation by means of programs, user defined sockets can be programmed.
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 R&S Signal Generator 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.
6.1.3.3 Interface Messages
In the LAN connection, the interface messages are called low–level control messages.
These messages can be used to emulate interface messages of the GPIB bus.
Command Long term Effect on the instrument
&ABO Abort Aborts processing of the commands just received.
&DCL Device Clear Aborts processing of the commands just received and sets
the command processing software to a defined initial state.
Does not change the instrument setting.
Remote Control Interfaces and Protocols
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