Agilent Technologies 42D Guia do Utilizador descarregar pdf (Página 64)

5-16

Programming and Documentation Conventions

Infinity Representation

The representation of infinity is 9.9E+37. This is also the value returned when

a measurement cannot be made.

Sequential and Overlapped Commands

IEEE 488.2 distinguishes between sequential and overlapped commands.

Sequential commands finish their task before the execution of the next

command starts. Overlapped commands run concurrently. Commands following

an overlapped command may be started before the overlapped command is

completed. All of the commands are sequential.

Response Generation

As defined by IEEE 488.2, query responses may be buffered for the following

conditions:

• When the query is parsed by the instrument.

• When the controller addresses the instrument to talk so that it may read the

response.

The responses to a query are buffered when the query is parsed.

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Agilent Technologies 42D Guia do Utilizador Página 64