Measurement-computing Digital488 Bedienungsanleitung PDF herunterladen (Seite 42)

Section 3 Command Descriptions

3.12

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:

DIM A$[50]

dimension the length of A$

CLEAR 718

reset the

Digital488

OUTPUT 718;"C2G2X"

configure ports 1 & 2 as output

OUTPUT 718;"D4E6BZX"

output hexadecimal

4E6B

to ports 1 & 2

ENTER 718; A$

read data from the

Digital488

DISP A$

display shows

4E6B

F1 Format - ASCII Character

In the

format, the data is coded and transmitted in ASCII Characters with the

four least significant bits of each ASCII character representing four bits of data.

F1 Character Decimal Equiv

00 88

11 99

22 :10

33 ;11

44 <12

55 =13

66 >14

77 ?15

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

)

and a suffix (

). 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.

1 2 ... 37 38 39 40 41 42 43 44 45 46 47 ... 82 83

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