Keithley 2750 User Manual page 313

11-12 Status Structure
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Operation event register
The bits of the Operation Event Register
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Bit B1 — Not used.
Bit B2, Query Error (QYE) — Set bit indicates that you attempted to read data
from an empty Output Queue.
Bit B3, Battery-backed RAM Error (BRE) — Set bit indicates that the scan can-
not be resumed (error +517) or there was a loss of data (error +516).
Bit B4, Execution Error (EXE) — Set bit indicates that the Model 2750 detected
an error while trying to execute a command.
Bit B3, Device-Dependent Error (DDE) — Set bit indicates that an instrument
operation did not execute properly. Some of the errors specific to the Model 2750
that will set this bit include the following:
• Error +516: Battery backed RAM error — Data stored in RAM has been lost.
Replace the battery if frequent failures occur.
• Error +517: Cannot resume scan — Due to a card ID change, auto scan has
disabled. The scan will not resume after a power interruption. For details, see
"Scan configuration," page
• Error +520: Saved setup scancard mismatch — Settings for a user setup or
power-on setup do not match the switching module types presently installed.
For details, see "Defaults and user setups," page
• Error +523: Card hardware error — Communication with the microprocessor
on a switching module card has been lost.
• Error +524: Unsupported card detected — The Model 2750 has detected an
installed Model 77XX switching module that is not supported by the current
version of firmware.
Bit B6, User Request (URQ) — Set bit indicates that the LOCAL key on the
Model 2750 front panel was pressed.
Bit B7, Power On (PON) — Set bit indicates that the Model 2750 has been turned
off and turned back on since the last time this register has been read.
Bits B0 through B3 — Not used.
Bit B4, Measuring (Meas) — Set bit indicates that the instrument is performing a
measurement.
Bit B5, Waiting for Trigger (Trig) — Set bit indicates that the Model 2750 is in
the trigger layer waiting for a trigger event to occur.
Bits B6 and B7 — Not used.
Bits B8, Filter Settled (Filt) — Set bit indicates that the filter has settled or the fil-
ter is disabled.
Bit B9 — Not used.
Bit B10, Idle State (Idle) — Set bit indicates the Model 2750 is in the idle state.
Bits B11 through B15 — Not used.
Model 2750 Multimeter/Switch System User's Manual
7-11, — Auto scan," page
(Figure 11-5) are described as follows:
7-20."
1-19."