CMU Status Reporting System
1100.4903.12 5.21 E-8
IST Flag and Parallel Poll Enable Register (PPE)
By analogy with the SRQ, the IST flag combines the entire status information in a single bit. It can be
queried by means of a parallel poll (cf. Section Parallel Poll on page 5.25) or using the command
"*IST?".
The parallel poll enable register (PPE) determines which bits of the STB contribute to the IST flag. The
bits of the STB are ANDed with the corresponding bits of the PPE, with bit 6 being used as well in con-
trast to the SRE. The IST flag results from the ORing of all results. The PPE can be set using com-
mands "*PRE" and read using command "*PRE?".
Event Status Register (ESR) and Event Status Enable Register (ESE)
The ESR is defined in IEEE 488.2. It can be compared with the EVENt part of an SCPI register. The
event status register can be read out using command "*ESR?".
The ESE is the associated ENABle part. It can be set using the command "*ESE" and read using the
command "*ESE?".
Table 5-3 Meaning of the bits used in the event status register
Bit No. Meaning
0
Operation Complete
This bit is set on receipt of the command *OPC exactly when all previous commands have been executed.
2
Query Error
This bit is set if either the controller wants to read data from the instrument without having sent a query, or if it
does not fetch requested data and sends new instructions to the instrument instead. The cause is often a query
which is faulty and hence cannot be executed.
3
Device-dependent Error
This bit is set if a device-dependent error occurs. An error message with a number between -300 and -399 or a
positive error number, which denotes the error in greater detail, is entered into the error queue (cf. annex B, Error
Messages).
4
Execution Error
This bit is set if a received command is syntactically correct but cannot be performed for other reasons. An error
message with a number between -200 and -300, which denotes the error in greater detail, is entered into the
error queue (cf. annex B, Error Messages).
5
Command Error
This bit is set if a command which is undefined or syntactically incorrect is received. An error message with a
number between -100 and -200, which denotes the error in greater detail, is entered into the error queue (cf.
annex B, Error Messages).
6
User Request
This bit is not used in the CMU.
7
Power On (supply voltage on)
This bit is set on switching on the instrument.
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