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1261B User Manual
Racal Instruments
Ó
1995
Using The Enhanced Monitoring System 4-13
Power Supply Voltages
Power Supply Currents
Fan
Speed
VXI Slot Temperatures
Elapsed
Time
VXI Bus Error and IACK Events
Thus, there is a “Voltage Condition Register”, a “Voltage Event
Register”, a “Voltage Enable Register”, a “Current Condition
Register”, a “Current Event Register” , and so on.
The “Condition Register” holds the present status of each of the
individual items monitored. For example, the “Voltage Condition
Register” has a total of seven meaningful bits (see
Figure 4-1
).
Each bit represents the present in-tolerance/out-of-tolerance
state of a single power supply voltage.
Bit 0 (the least significant bit) is set to 1 if the voltage for the +5V
power supply voltage is out of the programmable tolerance
limits. This bit is cleared to 0 if the +5V power supply voltage is
within the tolerance limits.
Similarly, bit 1 is set if the -5.2V power supply voltage is out of
tolerance, and cleared to 0 if it is in tolerance. The other bit
assignments for the “Voltage Condition Register” are shown in
Figure 4-1
.
Bits 15 through 7
Not assigned/
Always 0
Bit 6
-12V
PS
Bit 5
+12V
PS
Bit 4
-24V
PS
Bit 3
+24V
PS
Bit 2
-2V
PS
Bit 1
-5.2V
PS
Bit 0
+5V
PS
Figure 4-1, Voltage Condition Register
The Voltage Condition Register may be read with the query:
STAT:QUES:VOLT:COND?
This query returns an integer value in the range 0 to 127. The
value is formed by adding the bit values of each of the status
bits. For example, the value of 97 (64 + 32 + 1) indicates that
the -12V (64), +12V (32), and +5V (1) power supplies are out of
tolerance.
Each attribute monitored by the 1261B EMS has its own
“Condition Register”. The remaining condition registers may be
read with the following queries:
STAT:QUES:CURR:COND?
-- Current Condition
STAT:QUES:TEMP:COND?
-- Temperature Condition
STAT:QUES:FREQ:COND?
-- Fan Condition
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