IEEE-488 Reference
5-97
registers are shown in Figure 5-17 through Figure 5-20. Note that querying an event register
clears the bits in that register.
For example, assume that querying the Operation Event Register results in an acquired decimal
value of 34. The binary equivalent is 0000 0000 0010 0010. For this binary value, bits B5 and
B1 of the Operation Event Register are set.
The significance of a set bit in these registers depend on how the transition filter is programmed
(see :PTRansition and :NTRansition commands). If an event is programmed for a positive tran-
sition (PTR), the corresponding bit in this register will set when the event occurs (0 to 1 transi-
tion). If the event is instead programmed for a negative transition (NTR), the bit will set when
the event becomes not true (1 to 0 transition).
Operation event register:
Bit B0 —
Not used.
Bit B1, Settling (Set) —
Set bit indicates that the scan is currently in the settling period for a
relay (PTR) or the settling period has expired (NTR).
Bits B2, B3 and B4 —
Not used.
Bit B5, Waiting for Trigger (Trig) —
Set bit indicates that the instrument is waiting in the Trig-
ger Layer of the trigger model (PTR) or that it has left the Trigger Layer (NTR).
Bit B6, Waiting for Arm (Arm) —
Set bit indicates that the instrument is waiting in an Arm
Layer of the trigger model (PTR) or operation has passed from the arm layers into the trigger
layer (NTR).
Bits B7, B8 and B9 —
Not used.
Bit B10, Idle —
Set bit indicates that the instrument is in the idle state (PTR) or has left the idle
state to perform a scan (NTR).
Bits B11 through B15 —
Not used.
:STATus Subsystem
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