Measurement-computing Isolator488 Manual do Utilizador descarregar pdf (Página 28)

Section 3 IEEE 488 Primer

3-7

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

3.6 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.

3.7 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.

3.7.1 Go To Local (GTL)

This command allows the selected devices to be manually

controlled. ($01)

1 2 ... 23 24 25 26 27 28 29 30 31 32 33 34

Isolator488 1
Instruction Manual 3
IMPORTANT! 4
Table of Contents 5
Introduction 7
Section 1 Introduction 8
GETTING STARTED 10
Section 2 Getting Started 11
Isolator488 Internal View 14
IEEE 488 Primer 22
Section 3 IEEE 488 Primer 23
Service Information 33

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