R&S ESR Series User Manual page 625

®
R&S ESR
●
INSTR indicates the instrument resource class (optional)
Example:
●
Instrument has the IP address 192.1.2.3; the valid resource string using VXI-11
protocol is:
TCPIP::192.1.2.3::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.
● VXI-11
● 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 proto-
col, messages cannot be lost.
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 - 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. How-
ever, 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 requested com-
mand, but is delivered to the TCP/IP buffers.
For more information see also the application note:
User Manual 1175.7068.02 ─ 12
Protocol..................................................................................................... 622
Protocol.....................................................................................................622
Remote Control
Controlling the R&S ESR Remotely
622