Instructions

16 T3VNA Programming Guide
clearing all bits in all of the event registers. The status byte register summarizes
the states of the other registers. It is also responsible for generating service
requests.
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Example *CLS
3.1.4 Standard Event Status Enable (*ESE)
Command
Format
*ESE <number>
*ESE?
Instruction Set the bits in the standard event status enable register. This register monitors
I/O errors and synchronization conditions such as operation complete, request
control, query error, device dependent error, execution error, command error
and power on. A summary bit is generated on execution of the command.
The query returns the state of the standard event status enable register.
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Example *ESE 16
3.1.5 Standard Event Status Register Query (*ESR)
Command
Format
*ESR?
Instruction Queries and clears the standard event status event register. (This is a
destructive read.) The value returned reects the current state (0/1) of all the
bits in the register.
Menu None
Example *ESR?
3.1.6 Operation Complete Query (*OPC)
Command
Format
*OPC
*OPC?
Instruction Set bit 0 in the standard event status register to “1” when all pending operations
have finished.
The query stops any new commands from being processed until the current
processing is complete. Then it returns a “1”, and the program continues. This
query can be used to synchronize events of other instruments on the external
bus.
Returns a “1” if the last processing is complete. Use this query when there’s a
need to monitor the command execution status, such as a sweep execution.
Menu None
Example *OPC?
3.1.7 Service Request Enable (*SRE)
Command
Format
*SRE <integer>
*SRE?
Instruction This command enables the desired bits of the service request enable register.
The query returns the value of the register, indicating which bits are currently
enabled. The default value is 255.
Menu None
Example *SRE 1