Measurement Computing Micro 488/EX rev.2.1 - Manual (Page 119)

Section 5 Command Descriptions
5.49
CLEAR This event occurs 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 Macro is executed, the internal status, as read by the
STATUS
1 command, is cleared.
TALK This event occurs 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 This event occurs 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 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 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 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 1 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.