Measurement-computing Digital488 Manual de usuario descargar pdf (Pagina 36)

Section 3 Command Descriptions

3.6

Data Dn....Z

The

Data

command outputs up to 40 bits of data to the output ports. The number

of bits which can be sent with the

Data

command is limited by the number of bits

programmed as outputs. For formats

through

, if the amount of data sent is less

than the the number of bits programmed as outputs, the least-significant bits will contain

the data sent and the most-significant bits will be cleared to logic zero. If a single port is

selected with the

Port

command, only eight bits may sent with the

Data

command. The

Data Strobe

output is pulse for approximately 50 microseconds after new data is output

on the selected ports.

For formats

through

, data sent by the controller is contained within a prefix

(

) and a suffix (

). In format

, the five bytes immediately following the prefix (

) is

interpreted as data and the suffix (

) is not used. For the high speed binary

format,

all bytes received are treated as data and the prefix and suffix are not used. Refer to the

command for additional details.

Dn...Z

n...

represents the data to be outputted, terminated by

(note: in the

mode, the

terminator is not allowed)

Example:

CLEAR 718

reset the

Digital488

OUTPUT 718;"C5P1X"

all ports as output, select port 1

OUTPUT 718;"D55ZX"

send

to port 1

ENTER 718; A$

read data from port 1

DISP A$

display shows

OUTPUT 718;"P0X"

select all ports

OUTPUT 718;"D1234567890ZX"

send data to all 40 bits

ENTER 718;A$

read data from the Digital488

DISP A$

display shows

1234567890

1 2 ... 31 32 33 34 35 36 37 38 39 40 41 ... 82 83

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Measurement-computing Digital488 Manual de usuario Pagina 36

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