Measurement-computing Micro 488/EX rev.2.1 Bedienungsanleitung PDF herunterladen (Seite 82)

Section 5 Command Descriptions

5.12

ARM

The

ARM

command allows the Micro488/EX to automatically send event

messages to the serial host when one or more of the specified events occur. The event

messages that are returned are the same non-abbreviated strings as those used to

program the events.

There are two types of events, level sensitive and edge sensitive. Level sensitive

events, such as

SRQ

, will be reported every time they are

ARM

ed while the event

condition persists. Usually, some action must be taken (eg SPOLL) to clear the

condition prior to re-issuing the

ARM

. Edge sensitive events, such as

TRIGGER

, are

cleared when reported.

Regardless of the event sensitivity, the

ARM

command must be re-sent after the

event message is reported to re-activate the

ARM

ed condition. The optional events

include…

SRQ

The event message '

SRQ

' is returned to the serial host when the state

of the Service Request Bus Line is detected in the asserted state.

This event is level sensitive. If the condition exists at the time the

ARM

SRQ

command is issued, the Micro488/EX will return the event

message immediately. If the

ARM

command is issued without any

specified events, the SRQ event is assumed. This provides upward

compatibility with the Micro488/EX in previous Micro488 systems.

PERIPHERAL

The event message '

PERIPHERAL

' is returned to the serial host

when the Micro488/EX is forced from the Controller Active State

(*SC•CA) to the Peripheral State (*SC•*CA) by receipt of IFC from

the System Controller. This can be useful in detecting receipt of IFC

when in the *SC•CA state. This event is edge sensitive.

CONTROLLER

The event message '

CONTROLLER

' is returned to the serial host

when the Micro488/EX receives control of the bus and transitions

from the Peripheral State (*SC•*CA) to the Controller Active State

(*SC•CA). This occurs when the Take Control interface message is

received by the Micro488/EX. This event is edge sensitive.

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