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1261B User Manual
Using The Enhanced Monitoring System 4-42
Racal Instruments
Ó
1995
*SRE Command
The *SRE command sets the value of Service Request Enable
Register. The value of this register is logically ANDed with the
contents of the Status Byte (see the *STB? query description). If
any bits of this AND operation are set, bit 6 of the Status Byte is
set. That is:
bit 6 of Status Byte =
(bit 0 of SRE AND bit 0 of STB)
OR
(bit 1 of SRE AND bit 1 of STB)
OR
(bit 2 of SRE AND bit 2 of STB)
OR
(bit 3 of SRE AND bit 3 of STB)
OR
(bit 4 of SRE AND bit 4 of STB)
OR
(bit 5 of SRE AND bit 5 of STB)
OR
(bit 7 of SRE AND bit 7 of STB)
where:
SRE is the value as set by the *SRE command
STB is the value of the Status Byte which may be read
with *STB? query or by performing a serial poll
(VXI read STB command).
Bit 6 of the Status Byte is also known as the “Master Status
Summary” bit. When this bit transitions from a 0 to a 1, a VXI
Request True interrupt is generated by the EMS. When this bit
transitions from a 1 to a 0, a VXI Request False interrupt is
generated by the EMS.
The command has the format:
*SRE <SRE value>
where the “<SRE value>” is an integer numeric value in the
range 0 to 255. The value of bit 6 of this register is ignored,
since it does not make sense to “enable an interrupt when an
interrupt is generated”.
*SRE? Query
This query reads the value presently programmed for the
“Service Request Enable Register”. This reads the value as
programmed by the “*SRE” command.
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