IEEE-488 Reference
4-171
Defaults
Power-up Clears (0) all bits
*CLS Clears (0) all bits
:STATus:PRESet No effect
Description
These query commands are used to read the event registers. After sending one of these com-
mands and addressing the Model 2001 to talk, a decimal value is sent to the computer. The bi-
nary equivalent of this value determines which bits in the appropriate register are set. The event
registers are shown in Figures 4-22 through 4-27. Note that reading an event register clears the
bits in that register.
For example, assume that reading the Measurement Event Register results in an acquired deci-
mal value of 544. The binary equivalent is 0000001000100000. For this binary value, bits B5
and B9 of the Measurement Event Register are set.
The significance of a set bit in these registers depends 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. If the event is
instead programmed for a negative transition (NTR), the bit will set when the event becomes not
true.
Measurement Event Register:
Bit B0, Reading Overflow (ROF)
Set bit indicates that the reading exceeds the measurement
range of the instrument (PTR), or the instrument has gone from an overflow condition to a nor-
mal reading condition (NTR).
Bit B1, Low Limit 1 (LL1)
Set bit indicates that the reading is less than the Low Limit 1
setting (PTR), or that a subsequent reading is no longer less than the Low Limit 1 setting (NTR).
Bit B2, High Limit 1 (HL1)
Set bit indicates that the reading is greater than the High Limit
1 setting (PTR), or that a subsequent reading is no longer greater than the High Limit 1 setting
(NTR).
Bit B3, Low Limit 2 (LL2)
Set bit indicates that the reading is less than the Low Limit 2
setting (PTR), or that a subsequent reading is no longer less than the Low Limit 2 setting (NTR).
Bit B4, High Limit 2 (HL2)
Set bit indicates that the reading is greater than the High Limit
2 setting (PTR), or that a subsequent reading is no longer greater than the High Limit 2 setting
(NTR).
Bit B5, Reading Available (RAV)
Set bit indicates that a reading was taken and processed
(PTR), or that a subsequent reading is in process (NTR).
Bit B6
Not used.
Bit B7, Buffer Available (BAV)
Set bit indicates that there are at least two readings in the
trace buffer (PTR), or the buffer has become empty (NTR).
Bit B8, Buffer Half Full (BHF)
Set bit indicates that the trace buffer is half full (PTR), or
that the buffer is no longer half full (NTR).
Bit B9, Buffer Full (BFL)
Set bit indicates that the trace buffer is full (PTR), or that the buff-
er is no longer full (NTR).
Bit B10
Not used.
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