Measurement-computing Parallel488 Manuel d'utilisateur télécharger pdf (Page 30)

Section 4 IEEE to Parallel Operation

4.6

4.4.8 Untalk

(UNT)

UNT places the Parallel488 in the Talker Idle State.

4.5 IEEE Address Selection

SW1-1 through SW1-5 select the IEEE bus address of the Parallel488 when in

the IEEE to Parallel mode. The address is selected by simple binary weighting with SW1-

1 being the least significant bit and SW1-5 the most significant. The following figure

shows the IEEE address of the Parallel488 set to 10.

SW1 View for IEEE Address Selection

OPEN

12345678

DOT

Switch

Side

View

0 x 16

1 x 8

0 x 4

1 x 2

0 x 1

= 0

= 8

= 0

= 2

= 0

IEEE Address = 10

4.5.1 Listen Only Mode

Listen Only is a special type of IEEE to Parallel

operation. In the Listen

Only mode the Parallel488 accepts all data transmitted on the bus and transfers it

out its parallel port. The Parallel488 is set to Listen Only mode by setting its

address to 31 (switches SW1-1 through SW1-5 all open).

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Measurement-computing Parallel488 Manuel d'utilisateur Page 30