8.4 Command Message Description
152
Standard event status register (SESR)
The standard event status register is an 8-bit register.
RS-232C can read this register to learn instrument status.
The standard event status register is cleared in the following situations:
• When a *CLS command is received.
• When an *ESR? query is received.
• When the instrument is powered on.
Event Registers
Standard event status enable register (SESR)
Bit 7 PON Power on flag.
When the power is turned on, or on recovery from a power cut, this bit is set
to 1.
Bit 6 User request.
Unused
Bit
5
CME
Command error.
(The command to the message terminator is ignored.)
When a command which has been received contains a syntactic or semantic
error, this bit is set to 1.
• There is a mistake in a program header.
• The number of data parameters is wrong.
• The format of the parameters is wrong.
• Unsupported commands are received.
Bit 4 EXE Execution error.
When for some reason a command which has been received cannot be ex-
ecuted, this bit is set to 1.
• The designated data value is outside the set range.
• The designated data value is not acceptable.
• Some other function is being performed
Bit
3
DDE Device dependent error.
When a command cannot be executed due to some cause other than a com-
mand error, a query error, or an execution error, this bit is set to 1.
• Execution is impossible due to an abnormality inside the main instrument.
• The result of the pre-check (to prevent ground faults) for touch current
(Enclosure - Line) or leakage-current measurement between the enclo-
sure and the line is N.G.
• When abnormally terminated in automatic mode.
• When polarity switching is set as power on method and a power on check
ends in an error (NG)
Bit
2
QYE Query error. (output queue is cleared)
This bit is set to 1 when a query error is detected by the output queue control.
• When the data overflows the output queue.
• When data in the output queue has been lost.
Bit 1 RQC
（Communication error flag for RS-232C.）
Bit
0
OPC Operation terminated.
•Unused
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