Early GPIB, VXI and other technologies were designed using dedicated instrument interface standards, making the software from the underlying connectors, interface cards, and chassis to the instrument control functions proprietary and custom-made. This greatly increases the cost of the test system and seriously hinders the development of test technology. Subsequent PXI technology made full use of the existing computer bus technology, reducing the cost of the test system, but with the rapid development of the PC industry, the life cycle of test equipment based on computer interface is often shorter. This is clearly unacceptable for test systems that mostly require decades of continuous service.
Test engineers and system integrators require long-term, stable, and consistent interface standards to maintain the long-term life of the test system. Based on the above considerations, the LXI Alliance decided to adopt Ethernet as the new test interface standard. The Ethernet interface has been widely used in the industrial field for its high performance and low cost, and has been in use for decades. Its performance is still improving.
LXI (LAN eXtensions for InstrumentaTIon), a LAN-based instrument extension, is an extension of Ethernet technology in the field of test automation. Its bus specification combines the high performance of the instrument, the compactness of the plug-in instrument and the high speed of Ethernet. Throughput, and its performance is more compact, faster, cheaper, and more durable than previous test system solutions.
The LXI standard revolves around four main areas - physical requirements, Ethernet protocol, LXI interface, and LXI triggering. The standard is a combination of these required items. Instruments that comply with the LXI standard are called LXI devices, and LXI devices are divided into three types: Class C, Class B, and Class A. Class C LXI equipment is a basic type, it must comply with physical requirements, Ethernet protocol and LXI interface standard; Class B LXI equipment must meet the requirements of Class C equipment, plus LAN-based triggering and IEEE1588 timing synchronization protocol; Class A LXI devices include the hardware trigger bus in addition to the requirements of Class C and Class B.
The purpose of this design is to realize the LXI bus class B voltmeter through PIC32 microcontroller, and contribute to the research and application of LXI bus instrument.
Research status and analysis at home and abroadIn September 2004, Agilent Technologies and VXI Technologies jointly established the International LXI Alliance to introduce the LAN-based instrument bus standard, LXI. At the end of September 2005, the LXI Alliance officially released the 1.0 version of the LXI specification. In August 2006, the LXI Alliance introduced the 1.1 version of the LXI specification. Mainly to supplement the construction method of the hybrid system in version 1.0. The new LXI 1.2 release in October 2007 improved the discovery and verification mechanisms in the original specification.
As soon as the LXI bus was introduced, it attracted widespread attention in the industry. Currently, the LXI Alliance has 51 companies including most of the world's leading test and measurement companies. Several PlugFest events have been held under the auspices of the LXI Alliance. Agilent Technologies' first LXI-based instrument appeared in 2003, the 20MHZ function generator 33220A, and the world's first instrument with both GPIB, USB and LAN interfaces. At present, Agilent Technologies has launched more than 30 LXI-compliant T&M products represented by the 34410A digital multimeter. Most of them are Class A instruments, and less than 10 Class C instrument modules.
VXI Technologies has two Class A data acquisition products and is used in Boeing's newly developed 787 wide-body long-range passenger stress measurement system. All major test companies currently support LXI and have more than 300 products. For the introduction of the LXI bus, the domestic test community also responded positively. At present, Shaanxi Haitai Electronics Co., Ltd., Beijing Radio Measurement and Testing Institute, Beijing Aerospace Measurement and Control Technology Development Corporation and other units have joined the LXI Alliance. In September 2006, China successfully held the China LXI Consortium Inaugural Meeting and the 2006 Bus Technology and LXI Academic Conference. In June 2007, the LXI Alliance Member Conference and Advanced Technology Forum was successfully held. However, there are currently no instrument products that comply with the LXI bus specification in China, and key technologies are still being overcome.
In summary, the LXI bus specification combines the high performance of a GPIB instrument, the compact flexibility of a VXI/PXI plug-in instrument, and the high-speed throughput of Ethernet, taking into account instrumentation requirements such as timing, triggering, cooling, and electromagnetic compatibility. Compared to previous bus standards, LXI is not limited by bandwidth, software, and computer backplane bus. It has wider coverage, better inheritance performance, longer lifecycle, lower cost, and increased throughput based on Ethernet. Capabilities and performance advantages are sure to be the ideal solution for next-generation automated test systems.
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