PLZ-U Remote Control 6-33
6.6 Status Registers
Status registers are standard functions defined in the SCPI and IEEE 488.2.
Status registers can be classified into five groups: SCPI standard OPERation status
register, QUEStionable status register, PLZ-U-dedicated CSUMmary register,
IEEE488.2 standard event register, and status byte register.
SCPI registers
OPERation (SCPI requirement)
QUEStionable (SCPI requirement)
CSUMmary (PLZ-U dedicated)
IEEE488.2 registers
Standard event status register (*ESR?)
Status byte register (*STB?)
6.6.1 SCPI Registers
In each SCPI status register, there are sub registers, CONDition register, EVENt
register, ENABle register, PTRansition filter, and NTRansition filter.
Fig. 6-3 shows the SCPI status register structure. The character “+” represents the
logic sum of the register bits. Table 6-3 to Table 6-12 describe the bit number, bit
weight, and the meaning of each bit.
CONDition register
The transition of the CONDition register is automatic and reflects the condition of
the PLZ-U in real-time. Reading this register does not affect the contents.
EVENt register
The EVENt register bits are automatically set according to the changes in the CON-
Dition register. The rule varies depending on the positive and negative transition fil-
ters (PTRansition and NTRansition). The EVENt register is reset when it is read.
ENABle register
The ENABle register enables the reports to the summary bit or status bit of the event
bit.
Transition filter
Use the PTRansition (positive transition) filter to report events when the condition
changes from false to true.
Use the NTRansition (negative transition) filter to report events when the condition
changes from false to true.
If both the positive filter and the negative filter are set to true, events can be reported
each time the status changes.
If both of these filters are cleared, event reporting is disabled.
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