Measurement-computing Serial488/4 Manuel d'utilisateur télécharger pdf (Page 80)

Section 4 IEEE 488 Primer

4.9

4.7.8 Selected Device Clear (SDC)

This causes a single device to be initialized to a pre-defined or power up

state. ($04)

4.7.9 Serial Poll Disable (SPD)

The

SPD

command disables all devices from sending their Serial Poll

status byte. ($19)

4.7.10 Serial Poll Enable (SPE)

A device which is A ddressed to Talk will output its Serial Poll status

byte after

SPE

is sent and

ATN

is unasserted. ($18)

4.7.11 Group Execute Trigger (GET)

This command usually signals a group of devices to begin executing a

triggered action. T his allows actions of different devices to begin

simultaneously. ($08)

4.7.12 Take Control (TCT)

This command passes bus control responsibilities from the current

Controller

to another device which has the ability to control. ($09)

4.7.13 Secondary Command Group (SCG)

These are any one of the 32 possible commands (0 to 31) in this group.

They must immediately follow a talk or listen address. ($60 to $7F)

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Measurement-computing Serial488/4 Manuel d'utilisateur Page 80