Measurement-computing Digital HS Manuale Utente Scaricare il pdf (Pagina 46)

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

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. ($01)

4.7.2 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.

4.7.3 Unlisten (UNL)

1 2 ... 41 42 43 44 45 46 47 48 49 50 51 ... 55 56

Commenti su questo manuale

Nessun commento

Measurement-computing Digital HS Manuale Utente Pagina 46

Commenti su questo manuale

Prodotti e manuali riguardandi Hardware Measurement-computing Digital HS