HP 81101A Reference Manual page 21

Enable Register
The enable register defines which bits in an event register are included in
the logical OR into the summary bit. The enable register is logically
ANDed with the event register and the resulting bits ORed into the
summary bit. Enable registers are read/write, and are not affected by
*CLS or querying.
Although all status groups have all of these registers, not all status
groups actually use all of the registers. The following table summarizes
the registers used in the instrument status groups.
Status Group
QUEStionable
1
OPERation
Standard Event Status
Status Byte
1 Present, but not used. COND and EVEN always 0.
2 Use *ESR? to query.
3 Use *ESE to set, *ESE? to query
4 Use *STB? to query
5 Use *SRE to set, *SRE? to query
Registers in Group
CONDition NTR
√ √
x x
x x
x x
General Programming Aspects
Status Model
PTR EVENt
√ √
x x
√
x 2
√
x 4
ENABLe
√
x
√
3
√
5
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