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The following commands are used to access these registers;
*STB?
Query the Status Byte Summary Register. The instrument returns a decimal value
which corresponds to the binary-weighted sum of all bits set in the register.
*SRE <
enable value
>
Enable bits in the Service Request Enable Register. The selected bits are then
reported to the Status Byte.
*SRE?
Query the Service Request Enable Register. The instrument returns a decimal
value which corresponds to the binary-weighted sum of all bits set in the register.
Other Related Commands
*CLS
Clears the Status Byte Summary Register and all event registers, and also resets
the Operation Complete Command State and Operation Complete Query State.
*OPC
This command sets the instrument’s ‘Oper ation Complete Command State’ active.
When any ‘in-progress’ command is completed, the state returns to idle and the
Operation Complete bit (0) is set.
The command should only be used in conjunction with non-query commands and
is only available for IEEE. If the *OPC is sent in RS-232 mode it will generate a
“command error” and the command is ignored.
Example
Data logging can take an appreciable time to execute, so it is useful to program
the instrument to generate a service request on completion of the logging
function. The following command sequence can be used:
*ESE 1
Enables Operation Complete to set the Standard Event bit
*SRE 32
Enables Standard Event to trigger service request
*CLS
Clears the Operation Complete bit
DATA:START
Initiates data logging
*OPC
Sets RQS on completion of the log
*OPC?
This command sets the instrument’s ‘Operation Complete Query State’ active.
When any ‘in-progress’ command is completed, the state returns to idle, a ‘1’ is
placed in the output queue and therefore the Message Available bit (4) is set. The
command should only be used in conjunction with non-query commands and is
only available for IEEE.
If *OPC? is sent in RS-232 mode it will generate a “command error” and the
command is ignored.
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