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Receiving Information from the Instrument

After receiving a query (command header followed by a question mark), the

instrument interrogates the requested function and places the answer in its

output queue. The answer remains in the output queue until it is read or

another command is issued. When read, the answer is transmitted across the

interface to the designated listener (typically a controller). The input

statement for receiving a response message from an instrument’s output

queue typically has two parameters; the device address, and a format

specification for handling the response message. For example, to read the

result of the query command :CHANNEL1:COUPLING? you would execute

the Agilent BASIC statement:

ENTER <device address> ;Setting$

where <device address> represents the address of your device. This would

enter the current setting for the channel one coupling in the string variable

Setting$.

All results for queries sent in a program message must be read before another

program message is sent. For example, when you send the query

:MEASURE:RISETIME?, you must follow that query with an input statement.

In Agilent BASIC, this is usually done with an ENTER statement.

Sending another command before reading the result of the query causes the

output buffer to be cleared and the current response to be lost. This also

causes an error to be placed in the error queue.

Executing an input statement before sending a query causes the controller to

wait indefinitely.

The format specification for handling response messages is dependent on

both the controller and the programming language.

Programming Getting Started

Receiving Information from the Instrument

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Agilent Technologies HP 54601B Specifiche Pagina 29