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VX4101A MultiPaq Instrument User Manual
4–1
Status and Event Reporting System
The VX4101A Status system uses a hierarchical set of registers to provide status
information on all instruments. The structure of each instrument register is
composed of a set of three registers and two transition registers as defined in the
SCPI standard. The Standard Event Status Register and Status Byte Register are
defined by the IEEE 488.2 standard. For the purposes of this discussion, if a
register bit is referred to as being set, its value is a positive logic one (1). A bit
which is cleared has a value of positive logic zero (0).
In order to maintain conformance to the SCPI standard, the VX4101A has a
SCPI Questionable status register. This register is typically used to convey
information about the quality of an instrument operation. The
VX4101A places
warning messages in the error/event queue instead of using these registers. These
registers are identical in structure to the (OSR) Operational Status Registers
(simply substitute the keyword QUEStionable for OPERational), but are always
in the cleared state.
The following pages contain an overview of the
VX4101A status registers and a
description of the associated command set.