8.4 Communication Methods
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8
Chapter 8 RS-232C/GP-IB/LAN Interfaces
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.
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 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 DDE 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.
• Execution is impossible due to an internal instrument fault
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
Bit 1
unused
Bit 0 OPC Operation Complete (GP-IB only)
• 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 com-
mand
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