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4-11
Remote Operation
Monitoring the Instrument
Monitoring the Instrument
Your programs can monitor the HP 86140 series for its operating status,
including querying execution or command errors and determining whether or
not measurements have been completed. Several status registers and queues
are provided to accomplish these tasks as shown in Figure 4-1 on page 4-12.
The status structures shown in the figure consist of condition registers, event
registers, event enable registers, and, in the case of the Operation Status
Structure, transition filters. For example, there exists the Standard Status
Condition
Register, the Standard Status
Event
Register, and the Standard
Status
Event Enable
Register. Condition registers show the
current
condition
of the status lines. Event registers show that an event has occurred. Once
latched, these registers stay set until cleared. Event enable registers are
masks that you can use to enable or disable the reporting of individual bits
from an event register. For example, you can disable the reporting of the
Sweeping bit in the Operation Status structure so that, even though it goes
high in the registers, it can never set the summary bit 7 in the Status Byte
high.
Querying a register always returns the value as a decimal-weighted sum of all
set bits. Refer to Table 4-4 on page 4-11. For example, if the value returned
was 528, this would indicate that bits 4 and 9 were set. Mask registers are set
using these same values. For example, the
*ESE 60
command sets bits 2
through 5 of the Standard Status Event Enable Register. Whenever any one of
bits 2 through 5 of the Standard Status Event Register goes high, bit 5 of the
status byte will be set.
Table 4-4. Decimal Values of Event Enable Register Bits
Bit
Decimal
Value Bit
Decimal
Value Bit
Decimal
Value Bit
Decimal
Value
0 1 4 16 8 256 12 4096
1 2 5 32 9 512 13 8192
2 4 6 64 10 1024 14 16,384
3 8 7 128 11 2048 15 32,768
book.book Page 11 Monday, January 31, 2000 10:34 AM