Measurement-computing Extender 488HS Rev.2.0 Uživatelský manuál stáhnout pdf (Strana 25)

Section 3 IEEE 488 Primer

3.7

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)

3.7.2 Listen Address Group (LAG)

There are 31 (0 to 30) listen addresses associated with this group. The 3

most significant bits of the data bus are set to 001 while the 5 least significant

bits are the address of the device being told to listen.

3.7.3 Unlisten (UNL)

This command tells all bus devices to Unlisten. The same as

Unaddressed to Listen. ($3F)

3.7.4 Talk Address Group (TAG)

There are 31 (0 to 30) talk addresses associated with this group. The 3

most significant bits of the data bus are set to 010 while the 5 least significant

bits are the address of the device being told to talk.

3.7.5 Untalk (UNT)

This command tells bus devices to Untalk. The same as Unaddressed to

Talk. ($5F)

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Measurement-computing Extender 488HS Rev.2.0 Uživatelský manuál Strana 25