Remote Operation
Checking the Calibrator’s Status 5
5-51
5-32. Instrument Status Register
The Instrument Status Register (ISR) gives the controller access to the state of the
calibrator, including some of the information presented to the operator on the Control
Display and the display annunciators during local operation.
5-33. Instrument Status Change Register
The Instrument Status Change Register (ISCR) indicates which ISR bits have changed
status (from 0 to 1 or from 1 to 0) since the ISCR was last read. The ISCR is cleared (set
to 0) when the calibrator is turned on, and every time it is read.
5-34. Instrument Status Change Enable Register
The Instrument Status Change Enable Register (ISCE) is a mask register for the ISCR. If
a bit in the ISCE is enabled (set to 1) and the corresponding bit in the ISCR goes to 1, the
ISCB bit in the Status Byte is set to 1. If all bits in the ISCE are disabled (set to 0), the
ISCB bit in the Status Byte never goes to 1. The ISCE is cleared on power-up.
5-35. Bit Assignments for the ISR, ISCR, and ISCE
15 14 13 12 11 10 9 8
0 0 RPTBUSY SETTLED REMOTE WBND SCALE OFFSET
7 6 5 4 3 2 1 0
PLOCK PSHFT RLOCK RCOMP BOOST EXSENS EXGARD OPER
RPTBUSY When 1, a calibration report is being printed to the serial port.
SETTLED When 1, the output has stabilized to within specification.
REMOTE When 1, the calibrator is under remote control.
WBND When 1, the wideband is active.
SCALE When 1, scaling is active.
OFFSET When 1, an offset is active.
PLOCK When 1, the
calibrator’s output is phase locked to an external source.
PSHFT When 1, variable phase output is active.
RLOCK When 1, the
calibrator’s output range is locked.
RCOMP When 1, two-wired compensation is active when in resistance mode.
BOOST When 1, an auxiliary amplifier is active.
EXSENS When 1, external sensing is selected.
EXGARD When 1, external voltage guard is selected.
OPER When 1, the calibrator is operating, When 0, it is in standby.
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