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Despite the capabilities of Ethernet, Purser said, Ethernet alone is not enough. If you use Ethernet alone-and many instruments do have Ethernet interfaces-you'll need a way to configure hundreds of LAN options, to discover instruments, to connect test and measurement software to instruments, and to coordinate measurement activities. LXI, he added, provides a default LAN configuration to handle the details you would otherwise have to deal with Pandora Silver Bead - YA connecting your instruments to a LAN. To show how easy it can be to set up an LXI system, Purser at The MathWorks' Autotestcon booth demonstrated a communications-channel test setup comprising Agilent and Tektronix instruments operating in conjunction with a PC running MathWorks' Matlab software.

Van Woerkom of Agilent elaborated on LXI's capabilities, noting that it provides a consistent set of LAN communication services for test systems, supports LAN discovery for instruments, defines a standard Web page for instruments, specifies IVI drivers, requires interoperability testing for compliant products, and offers extensions for triggering and synchronization.If you've ever dealt with your IT department, you might believe that LAN connectivity is Pandora Silver Bead - YJ bug and not a feature. Speaking during the Autotestcon presentation, Stasonis of Pickering Interfaces commented on how to avoid pitfalls when connecting instruments to a corporate network and offered advice on dealing with firewalls and your IT department, which, he said, is understandably concerned with uptime and security issues.

Class B instruments implement the IEEE 1588 standard to provide synchronization among instruments, each of which includes its own clock operating at a slightly different rate from its neighbors. Class Pandora on sale systems include one timekeeping master and several slaves, using time stamps to keep clock deltas in the tens of nanoseconds, Sarfi said. He concluded by describing Class A instruments, which include an eight-lane M-LVDS (multipoint-low-voltage-differential-signaling) bus to support precise asynchronous handshaking at hardware speeds, with errors limited to propagation delays.If you must communicate with instruments across a campus or around the world, or if you want to provide remote access to the instruments in your lab, IT involvement is essential.

According to Stasonis, you'll need to identify the number of IP addresses you need, define a network topology that minimizes latency and simplifies discovery, and describe Pandora Chains anticipated network traffic with respect to bandwidth and the services and protocols you'll be using. In addition, you will want to determine where you archive test results and how to handle system updates-of virus protection, for example.If the requirements for your automated test system are modest, you might get by with a configuration that won't upset your IT department, said Van Woerkom. He described a system with a PC, a router, and LXI-compatible instruments configured in an isolated subnet. You can let your router configure your instruments using the DHCP, although manually assigning IP addresses and aliases can avoid problems associated with address reassignment and can simplify programming.