Measurement Computing Micro 488/EX rev.2.1 - Manual (Page 83)

Section 5 Command Descriptions
5.13
TRIGGER The event message 'TRIGGER' is returned to the serial host when the
Micro488/EX, as a Peripheral (*CA), receives a Group Execute
Trigger (GET) command from the Active Controller. This event is
edge sensitive. When the event message is sent, the internal status, as
read by the STATUS 1 command, is cleared.
CLEAR The event message 'CLEAR' is returned to the serial host when the
Micro488/EX, as a Peripheral (*CA), receives a Device Clear (DCL)
or a Selected Device Clear (SDC) command from the Active
Controller. This event is edge sensitive. When the event message is
sent, the internal status, as read by the STATUS 1 command, is
cleared.
TALK The event message 'TALK' is returned to the serial host when the
Micro488/EX, as a Peripheral (*CA), detects its My Talk Address
(MTA) command from the Active Controller. It indicates that the
controller has requested information from the Micro488/EX. This
event is edge sensitive.
LISTEN The event message 'LISTEN' is returned to the serial host when the
Micro488/EX, as a Peripheral (*CA), detects its My Listen Address
(MLA) command from the Active Controller. It indicates that the
controller has information it wants to send to the Micro488/EX. This
event is edge sensitive.
IDLE The event message 'IDLE' is returned to the serial host 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
event message is sent, the internal address change status, as read by
the STATUS 1 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 The event message 'CHANGE' is returned to the serial host 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 event