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Infinity Representation
The representation of infinity is 9.9E+37 for real numbers and 32767 for
integers. This is also the value returned when a measurement cannot be
made.
Sequential and Overlapped Commands
IEEE 488.2 makes the distinction between sequential and overlapped
commands. Sequential commands finish their task before the execution of
the next command starts. Overlapped commands run concurrently; therefore,
the command following an overlapped command may be started before the
overlapped command is completed. The overlapped commands for the
1660-series logic analyzers are STARt and STOP.
Response Generation
IEEE 488.2 defines two times at which query responses may be buffered.
The first is when the query is parsed by the instrument and the second is
when the controller addresses the instrument to talk so that it may read the
response. The 1660-series logic analyzers will buffer responses to a query
when it is parsed.
Syntax Diagrams
At the beginning of each chapter in Parts 2 through 4, "Commands," is a
syntax diagram showing the proper syntax for each command. All characters
contained in a circle or oblong are literals, and must be entered exactly as
shown. Words and phrases contained in rectangles are names of items used
with the command and are described in the accompanying text of each
command. Each line can only be entered from one direction as indicated by
the arrow on the entry line. Any combination of commands and arguments
that can be generated by following the lines in the proper direction is
syntactically correct. An argument is optional if there is a path around it.
When there is a rectangle which contains the word "space," a white space
character must be entered. White space is optional in many other places.
Programming and Documentation Conventions
Infinity Representation
4–4