Remote Control Basics > Remote Control Interfaces and Protocols > LAN Interface > HiSLIP Protocol
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 firewalls
  • 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 requested command, but is delivered to the TCP/IP buffers.

For more information see also the application note: 1MA208: Fast Remote Instrument Control with HiSLIP.

 


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