Measurement-computing Digital488 Manual de usuario descargar pdf (Pagina 44)

Section 3 Command Descriptions

3.14

Data received for output to the digital ports must be contained within a prefix

(

) and a suffix (

) and each 4-bit quantity must be separated by semicolons. Leading

zeros are not required. If the amount of data sent is less than 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 the data sent is greater than the

number of bits programmed for output or selected by the

command, the

Digital488

will generate a conflict error and ignore the entire command string. The

Data Strobe

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

selected port(s).

When the

Digital488

is addressed to talk (

) it asserts

Inhibit

, reads the data

from all ports, unasserts

Inhibit

and outputs the number of characters determined by

the

and

commands. Leading zeros are not suppressed and the bus terminators

are appended to the output. After output the

Digital488

must be re-addressed to talk to

perform subsequent reads.

EDR

(

) may also be used to capture data in this format.

Example:

OUTPUT 718;"F2X"

select ASCII/binary mode

ENTER 718;A$

read data from the

Digital488

DISP A$

display shows

0001;1111;1111;0001

OUTPUT 718;"D1111;0;1010;0101ZX"

ENTER 718; A$

read data from the

Digital488

DISP A$

display shows

1111;0000;1010;0101

F3 Format - ASCII Decimal

In the

format, the data is described in decimal 8 bit multiples and transmitted

in ASCII. Each decimal number (0 to 255) to be output must be separated by semicolons.

1 2 ... 39 40 41 42 43 44 45 46 47 48 49 ... 82 83

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Measurement-computing Digital488 Manual de usuario Pagina 44

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