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SCPI commands to an instrument may either perform a set operation (e.g. switching a power supply on) or a query operation (e.g. reading a voltage). Queries are issued to an instrument by appending a question-mark to the end of a command. Some commands can be used for both setting and querying an instrument.
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The drivers encapsulate the Standard Commands for Programmable Instruments (SCPI) commands, which are an ASCII-based set of commands for reading and writing instrument settings and measurement data. This standard allows an abstract way of using various programming languages to program remote-control applications instead of using SCPI commands.
The “synchronous channel” carries normal bi-directional ASCII command traffic (e.g., SCPI), and synchronous GPIB meta-messages (END, triggers, etc.). The “asynchronous channel” carries GPIB-like meta-messages that need to be treated at higher priority and independent of the data path (e.g., device clear, service request).
Proposed in 2005 by Keysight [2] and VTI Instruments, [3] the LXI standard adapts the Ethernet and World Wide Web standards to test and measurement applications. [4] The standard defines how existing standards should be used in instrumentation applications to provide a consistent feel and ensure compatibility between equipment.
Virtual instrument software architecture (VISA) is a widely used application programming interface (API) in the test and measurement (T&M) industry for communicating with instruments from a computer.
SCPI added standard generic commands, and a series of instrument classes with corresponding class-specific commands. SCPI mandated the IEEE 488.2 syntax, but allowed other (non-IEEE 488.1) physical transports. The IEC developed their own standards in parallel with the IEEE, with IEC 60625-1 and IEC 60625-2 (IEC 625), later replaced by IEC 60488-2.
SCPI is the Standard Commands for Programmable Instruments for controlling programmable test and measurement devices. SCPI or SCPi may also refer to: Pullamí Airport (ICAO airport code), in the List of airports in Chile; Sequential Central Port Injection, in the Chevrolet 90° V6 engine