Measurement-computing Digital488 Bedienungsanleitung PDF herunterladen (Seite 41)

Section 3 Command Descriptions

3.11

Format Fn

The

Format

command determines the method by which input and output data will

be described. Six data formats are available.

ASCII Hexadecimal (4 bits per character)

ASCII Character (4 bits per character )

ASCII Binary (1 bit per character)

ASCII Decimal (8 bits per number)

Binary (each byte represents 8 bits)

High Speed Binary (each byte represents 8 bits)

F0 Format- ASCII Hexadecimal

In the default

format, the data is described in ASCII hexadecimal, with each

character having a value from 0 thru 9 or A thru F. Each ASCII character describes 4

bits of data.

F0 Character Decimal Equiv

00 8 8

11 9 9

22 A 10

33 B 11

44 C 12

55 D 13

66 E 14

77 F 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. The

Data Strobe

output is pulse for

approximately 50 microseconds after new data is output on the selected port(s).

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Measurement-computing Digital488 Bedienungsanleitung Seite 41