Agilent Technologies 42D Guide de l'utilisateur télécharger pdf (Page 75)

6-9

Status Reporting

Status Byte Register (SBR)

Example The following example uses the *STB? query to read the contents of the

oscilloscopes Status Byte Register.

10 OUTPUT 707;"*STB?" !Query the Status Byte Register

20 ENTER 707;Result !Place result in a numeric variable

30 PRINT Result !Print the result

40 End

The next program prints 112 and clears bit 6 (RQS) of the Status Byte Register.

The difference in the decimal value between this example and the previous one

is the value of bit 6 (weight = 64). Bit 6 is set when the first enabled summary

bit is set and is cleared when the Status Byte Register is read by the serial poll

command.

Example The following example uses the HP BASIC serial poll (SPOLL) command (GPIB

only) to read the contents of the oscilloscopes Status Byte Register.

10 Result = SPOLL(707)

20 PRINT Result

30 END

Use Serial Polling to Read Status Byte Register

Serial polling is the preferred method to read the contents of the Status Byte Register

because it resets bit 6 and allows the next enabled event that occurs to generate a

new SRQ interrupt.

1 2 ... 70 71 72 73 74 75 76 77 78 79 80 ... 109 110

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Agilent Technologies 42D Guide de l'utilisateur Page 75