Measurement-computing Parallel488 Manual do Utilizador descarregar pdf (Página 39)

Section 5 IEEE 488 Primer

5.7

All

Ready

All

Ready

None

Ready

None

Ready

Valid Not

Valid

Not

Valid

1st Data Byte 2nd Data Byte

All

None

DIO1-8

(composite)

DAV

NRFD

NDAC

Source

Acceptor

IEEE Bus Handshaking

5.6 Data Lines

The GPIB provides eight data lines for a bit parallel/byte serial data transfer. These eight data lines

use the convention of

DIO1

through

DIO8

instead of the binary designation of

. The data lines are

bidirectional and are active low.

5.7 Multiline Commands

Multiline (bus) commands are sent by the Active Controller over the data bus with ATN asserted.

These commands include addressing commands for talk, listen, Untalk and Unlisten.

5.7.1 Go To Local (GTL)

This command allows the selected devices to be manually controlled. ($01)

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Measurement-computing Parallel488 Manual do Utilizador Página 39