Measurement-computing Digital488 Manual do Utilizador descarregar pdf (Página 56)

Section 3 Command Descriptions

3.26

Status Un

The

Status

command (

) will cause the

Digital488

to send the status message when

next addressed to talk. The status of the

Digital488

may be read at any time without

interfering with normal operation. Any error conditions are cleared after the status string is

read by the controller. The

Status

command (

) also enables the controller to read any single

bit from the I/O ports

(U1

through

U40).

Send the

Digital488

status when next addressed to talk

Send the status of bit n (1 thru 40) when next addressed to talk

The format of the status byte returned by the

Digital488

after receiving a

command

is as follows:

*.*C#E#F#G#I###K#M###P#R#Y#

where each

equals the number corresponding to that command. The leading

information

*.*

is the revision level of the

Digital488

firmware.

Example:

DIM A$[50]

dimension A$

CLEAR 718

reset the

Digital488

OUTPUT 718;"U0X"

send

to the

Digital488

ENTER 718; A$

read the status byte

DISP A$

display =

1.0C0E0F0G0I000K0M000P0R0Y0

The status returned after receiving a

through

U40

is an ASCII character '1' or '0',

depending on the level of the line, and the state of the

Invert

command (

I16).

CLEAR 718

reset the

Digital488

OUTPUT 718;"U22X"

request the status of bit 22

ENTER 718;A$

read the status bit

DISP A$

display shows a

(dependent on the signal

applied to the input

1 2 ... 51 52 53 54 55 56 57 58 59 60 61 ... 82 83

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