1269 User Manual
Using The Enhanced Monitoring System 4-5
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Each of these queries causes the 1269 EMS to reply with an
integer value. The unit of measure is seconds.
Reading The Present
State of VXI Signals
The 1269 EMS has the capability to read the present state of
the VXI SYSFAIL*, ACFAIL*, and AS* (address strobe) lines.
The following commands may be used to read the present
state of each of these lines:
MEAS:VXI:ACFAIL?
-- read ACFAIL* line
MEAS:VXI:SYSFAIL?
-- read SYSFAIL* line
MEAS:VXI:ASTROBE?
-- read AS* line
Each of these queries causes the 1269 EMS to reply with a 1 if
the line is high, or a 0 if the line is low. Note that since each of
these lines is asserted when low, the normal reply should be
“1".
Monitoring The VXI
Subsystem
The 1269 EMS has the ability to monitor the VXI power
supplies’ voltage, VXI slot temperatures, fan speeds, and
select VXI signals. When one of these is outside the user-
specified limits, an interrupt can be generated. This allows the
system controller (computer) to effectively monitor the VXI
subsystem without having to continually poll the 1269 EMS.
Each attribute is checked once per second, at a minimum, by
the EMS. If the attribute value is outside the programmed
limits, an “alarm” condition is assumed to exist. If the EMS has
been told to generate an interrupt when the alarm condition
exists, an interrupt will be sent to the system controller (by
asserting one of the VXI interrupt lines IRQ1 to IRQ7).
When the system controller detects the interrupt, it can read
status registers on the EMS to determine which attribute is at
fault. It can then query the EMS to determine the present value
of the attribute. It can also query the EMS to determine the
time and date of the alarm condition.
Programming the EMS to perform this monitoring is done as a
two-step process:
1)
Program the tolerance limits for the attribute
2)
Program the status registers to generate an
interrupt when the attribute is outside its
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