Hioki RM3542 - Event Registers

9.5 Communication Methods
111
9
 Standard Event Status Register (SESR)
The Standard Event Status Register is an 8-bit register.
If any bit in the Standard Event Status Register is set to 1 (after masking by the Standard
Event Status Enable Register), bit 5 (ESB) of the Status Byte Register is set to 1.
See: "Standard Event Status Register (SESR) and Standard Event Status Enable Register (SESER)" (p.
112)
The Standard Event Status Register is cleared in the following situations:
• When a 
CLS command is executed
• When an event register query (
ESR?) is executed
• When the instrument is powered on
Event Registers
Bit 7 PON
Power-On Flag
Set to 1 when the power is turned on, or upon recovery from an outage.
Bit 6 URQ
User Request
unused
Bit 5 CME
Command error (The command to the message terminator is ignored.)
This bit is set to 1 when a received command contains a syntactic or semantic
error:
• Program header error
• Incorrect number of data parameters
• Invalid parameter format
• Received a command not supported by the instrument
Bit 4 EXE
Execution Error
This bit is set to 1 when a received command cannot be executed for some
reason.
• The specified data value is outside of the set range
• The specified setting data cannot be set
• Execution is prevented by some other operation being performed
Bit 3
(unused)
DDE
Not used by this instrument
Device-Dependent Error
This bit is set to 1 when a command cannot be executed due to some reason
other than a command error, a query error or an execution error.
Bit 2 QYE
Query Error (the output queue is cleared)
This bit is set to 1 when a query error is detected by the output queue control.
• When an attempt has been made to read an empty output queue (GP-IB
only)
• When the data overflows the output queue
• When data in the output queue has been lost
• When the next command is received while there is data in the output
queue
Bit 1
RQC
(unused)
Request Control
Bit 0 OPC
Operation Complete
This bit is set to 1 in response to an
OPC command.
• It indicates the completion of operations of all messages up to the OPC
command