Measurement-computing Micro 488/EX rev.2.1 Manual do Utilizador descarregar pdf (Página 57)

Section 4 General Programming

4.15

IDLE

This event occurs when the Micro488/EX, as a Peripheral

(*CA), transitions from a Talker or Listener state to an idle

state (neither talker or listener). It indicates that the

controller has unaddressed the Micro488/EX with either

an UNT or UNL command. This event is edge sensitive.

When the

MACRO

is executed, the internal status, as read

by the

STATUS

command, is cleared. This event is

tested prior to the

CHANGE

event and will clear the

internal

CHANGE

status only when the addressed to un-

addressed transition occurs.

CHANGE

This event occurs when the Micro488/EX, as a Peripheral

(*CA), detects an addressed state change. This occurs on

transitions from a Talker or Listener state to an idle state

(neither talker or listener), or from an idle state to a talker

or listener state. This event is edge sensitive. When the

MACRO

is executed, the internal status, as read by the

STATUS

command, is cleared. This event is tested after

the

IDLE

event. If

IDLE

is enabled, the

CHANGE

event's

Macro will only execute when an un-addressed to an

addressed transition occurs.

ERROR

This event occurs when the Micro488/EX detects an error

condition. The error condition may be an un-recognized

command from the serial host, an invalid parameter or a

bus error. Refer to Appendix B for a listing of the error

conditions which can be detected by the Micro488/EX.

This event is level sensitive. When the

MACRO

executes,

the error status, as read by any of the

STATUS

commands, must be read prior to enabling this event

again.

STARTUP

This edge sensitive event occurs when the Micro488/EX is

powered on, upon the receipt of an

character, double

characters or

RESET

command. If a

MACRO

has been

assigned as a STARTUP macro, it sets

LOG

and

executes. This is the only event which cannot be re-

enabled within a

MACRO

. Although

STARTUP

is a valid

condition within the

ARM

command, it does not

ARM

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