Agilent Technologies 8935 Series Manual de usuario descargar pdf (Pagina 144)

144 Chapter 6

O:\Manuals\E6380A_Progguid\Book\Advoper.fm

Advanced Operations

Status Reporting

Accessing the Output Queue

When messages are sent to the Test Set, it decodes the message to

determine what commands have been sent. Depending upon the type of

command, the Test Set’s processor sends messages to various parts of

the instrument. Many commands generate data which must be sent

back to the controller. This data is buffered in the Output Queue until it

is read by the controller. The availability of data is summarized in the

MAV bit of the Status Byte Register. The state of the MAV message

indicates whether or not the Output Queue is empty. The MAV message

is TRUE, logic 1, when there is data in the Output Queue and FALSE,

logic 0, when it is empty. The Output Queue is read by addressing the

Test Set to TALK and then handshaking the bytes out of the Output

Queue. Depending upon the type of command sent, the data may

appear in the Output Queue almost immediately, or it may take several

seconds (as is the case with some Signaling Decoder measurements).

Care should be exercised when reading the Output Queue since the

HP-IB bus will, by design, wait until the data is available before

processing further bus messages.

Reading the Output Queue

Example 6-40 Example

Enter 714;Output_data

1 2 ... 139 140 141 142 143 144 145 146 147 148 149 ... 328 329

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Agilent Technologies 8935 Series Manual de usuario Pagina 144