Measurement-computing Serial488/4 Manual do Utilizador descarregar pdf (Página 48)

Section 3 Command Descriptions

3.9

Input Query I?

The Input Query command returns the number of characters available to be read

on the the IEEE bus from the selected serial port ( i.e. the port's serial input buffer ).

The Port Select command (

) is used to select the serial port regardless of addressing

mode in use.

Return number of characters in the input buffer.

Example 1: Find the number of input characters available on port 1 using dual

primary addressing mode.

PRINT#1,"OUTPUT08;P1x"

select port 1

PRINT#1,"OUTPUT08;I?" request number of serial input characters

PRINT#1,"ENTER08"

INPUT#2,A$ read the response

PRINT A$

display shows

I00010

, 10 characters

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

addressing mode.

PRINT#1,"OUTPUT0800;P1xI?"

select port 1 and request number of input

PRINT#1,"ENTER0800" characters available

INPUT#2,A$

read the response

PRINT A$

display shows

I00033

, 33 characters

1 2 ... 43 44 45 46 47 48 49 50 51 52 53 ... 90 91

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Measurement-computing Serial488/4 Manual do Utilizador Página 48