Measurement-computing Digital488 User Manual download pdf (Page 67)

Section 4 IEEE 488 Primer

4.7

4.6 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.

4.7 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.

4.7.1 Go To Local (GTL)

This command allows the selected devices to be manually controlled.

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Measurement-computing Digital488 User Manual Page 67