Measurement-computing Isolator488 Manuale Utente Scaricare il pdf (Pagina 30)

Section 3 IEEE 488 Primer

3-9

3.7.8 Selected Device Clear (SDC)

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

power up state. ($04)

3.7.9 Serial Poll Disable (SPD)

The

SPD

command disables all devices from sending their Serial

Poll status byte. ($19)

3.7.10 Serial Poll Enable (SPE)

A device which is Addressed to Talk will output its Serial Poll

status byte after

SPE

is sent and

ATN

is unasserted. ($18)

3.7.11 Group Execute Trigger (GET)

This command usually signals a group of devices to begin

executing a triggered action. This allows actions of different devices to

begin simultaneously. ($08)

3.7.12 Take Control (TCT)

This command passes bus control responsibilities from the current

Controller

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

3.7.13 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 Isolator488 Manuale Utente Pagina 30