Agilent Technologies 54503A User's Guide download pdf (Page 318)

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318 Chapter5

Programming

Input and Output Buffers

If you have a timeout statement in your program, the timeout can

occur; this depends on whether the timeout setting is shorter than the

pause in the program.

Synchronizing Your Program

You can use spectrum analyzer queries to synchronize a program. For

example, when executing a TS command, if you want to know when the

TS command is complete, execute the DONE command immediately

after TS. The DONE query is satisﬁed only after the sweep has been

completed. In fact, you can use any query in this manner. No query

operation can take place until after the previous command is complete.

Clearing the Buffers

If you use the output-data buffer correctly, the buffer should be clear

after the last ENTER statement is executed. But if you want to ensure

that the buffer is empty, execute the device clear statement CLEAR

718. If your program is returning incorrect values,use this statement to

clear the buffer; then look through your program for any missing

ENTER statements. Or, use CLEAR at the beginning of a program.

CLEAR ﬂushes out the output-data and input-data buffers; however, it

also executes an instrument preset.

Summary

Figure 5-9 on page 318 illustrates the input and output data buffers.

Below, the causes for the analyzer not accepting data are described.

Figure 5-9 Buffer Summary

The spectrum analyzer will stop accepting data under these

nonexclusive conditions:

1. A sweep or lengthy command is not done and the input buffer is full.

2. The output and input buffers are full and the command currently

executed is a query.

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