2
IEEE-488 Command Reference
56
Keysight 8990B Programming Guide
*SRE <NRf>
The
*SRE
(Service Request Enable)
command enables the bits in the Status Byte
enable register. The selected enabled bits are summarized in the “Master Status
Summary” (MSS) bit (bit 6) of the Status Byte register. If any of the selected bit
condition changes from 0 to 1, a Service Request is generated. The
<NRf>
parameter is used to specify which bits to enable. The specified decimal value
corresponds to the binary-weighted sum of the bits you wish to enable in the
register. For example, to enable bit 2 (decimal value = 4) and bit 5 (decimal value
= 32), the corresponding decimal value would be 36 (4 + 32).
The following table lists the bit definitions of the Status Byte register:
Table 2-3
Bit definitions: Status Byte register
Refer to
“Status Byte summary register”
on page 39 for more details.
Syntax
Bit
Weight/Decimal value
Definition
0
1
Not used
1
2
Device Status register summary
2
4
Error/Event queue
3
8
Questionable Status register summary
4
16
Message available
5
32
Standard Event register summary
6
64
Master Status summary (Request for service)
7
128
Operation Status register summary
*SRE
NRf
?
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