Measurement-computing Serial488/4 Manual de usuario descargar pdf (Pagina 55)

Section 3 Command Descriptions

3.16

Output Query O?

The Output Query command returns the number of characters w aiting to be

transmitted out on the selected serial port ( i. e. the port's serial output buffer ). The

Port Select command (

) is used to select the serial port regardless of addressing

mode in use.

Return number of characters in the serial output buffer.

Example 1: Find number of output characters on port 1 using dual primary

addressing mode.

PRINT#1,"OUTPUT08;P1x"

select port 1

PRINT#1,"OUTPUT08;O?" request number of serial output characters

PRINT#1,"ENTER08"

INPUT#2,A$ read the response

PRINT A$

display shows

O00010

, 10 characters

Example 2: Find number of output characters on port 1 using secondary

addressing mode.

PRINT#1,"OUTPUT0800;P1xO?"

select port 1 and request number of output

PRINT#1,"ENTER0800" characters waiting to be sent

INPUT#2,A$

read the response

PRINT A$

display shows

O00033

, 33 characters

1 2 ... 50 51 52 53 54 55 56 57 58 59 60 ... 90 91

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Measurement-computing Serial488/4 Manual de usuario Pagina 55