Monitoring The Instrument - HP 86140A Series User Manual

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
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
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
Decimal
Bit Value
0 1
1 2
2 4
3 8
4-11. For example, if the value returned
Decimal
Bit Value Bit
4 16 8
5 32 9
6 64 10
7 128 11
Remote Operation
Monitoring the Instrument
Figure 4-1 on page
Decimal Decimal
Value Bit Value
256 12 4096
512 13 8192
1024 14 16,384
2048 15 32,768
4-12.
4-11