R&S ZVB - Page 612

R&S
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ZVA / R&S
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ZVB / R&S
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ZVT Remote Control
Status Reporting System
Operating Manual 1145.1084.12 – 30 597
The CONDition part is permanently overwritten by the hardware or the sum bit of the next lower
register. Its contents always reflect the current instrument state.
This register part can only be read, but not overwritten or cleared. Reading the CONDition register
is nondestructive.
 PTRansition
The two transition register parts define which state transition of the condition part (none, 0 to 1, 1
to 0 or both) is stored in the EVENt part.
The Positive TRansition part acts as a transition filter. When a bit of the CONDition part is
changed from 0 to 1, the associated PTR bit decides whether the EVENt bit is set to 1:
o PTR bit =1: the EVENt bit is set.
o PTR bit =0: the EVENt bit is not set.
This status register part can be overwritten and read at will. Reading the PTRansition register is
nondestructive.
 NTRansition
The Negative TRansition part also acts as a transition filter. When a bit of the CONDition part is
changed from 1 to 0, the associated NTR bit decides whether the EVENt bit is set to 1.
NTR bit =1: the EVENt bit is set.
NTR bit =0: the EVENt bit is not set.
This part can be overwritten and read at will. Reading the PTRansition register is nondestructive.
 EVENt
The EVENt part indicates whether an event has occurred since the last reading, it is the "memory"
of the condition part. It only indicates events passed on by the transition filters. It is permanently
updated by the instrument. This part can only be read by the user. Reading the register clears it.
This part is often equated with the entire register.
 ENABle
The ENABle part determines whether the associated EVENt bit contributes to the sum bit (cf.
below). Each bit of the EVENt part is ANDed with the associated ENABle bit (symbol '&'). The
results of all logical operations of this part are passed on to the sum bit via an OR function
(symbol '+').
o ENAB bit =0: The associated EVENt bit does not contribute to the sum bit.
o ENAB bit =1: If the associated EVENT bit is "1", the sum bit is set to "1" as well.
This part can be overwritten and read by the user at will. Its contents are not affected by reading.
As shown in the graphical overview, the status information is of hierarchical structure.
 STB, SRE The register STatus Byte (STB) defined in IEEE 488.2 and its associated mask register
Service Request Enable (SRE) form the highest level of the status reporting system. The STB
provides a rough overview of the instrument status, collecting the information of the lower-level
registers.
 ESR, SCPI registers
The STB receives its information from the following registers:
o The standard IEEE 488.2 Event Status Register (ESR) with the associated mask register
standard event status enable (ESE).
o The STATus:OPERation and STATus:QUEStionable registers which are defined by SCPI