E4990A Help
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The status reporting system has a hierarchical structure as shown in the
figure above. When the instrument satisfies a particular condition, the
corresponding bit of the event register is set to 1. Therefore, you can
check the instrument status by reading the event register.
When the event register bit is set to "1" and a corresponding enable
register bit (a bit marked with an arrow in General status register model) is
also "1," the summary bit of the status byte register is set to "1." You can
read the status byte register by using the serial poll.
If the bit of the service request enable register is "1," a service request
(SRQ) is generated by the positive transition of the corresponding status
byte register bit. By generating SRQ, you can notify the controller that the
E4990A is requesting service. In other words, interruption by SRQ can be
programmed.
Event Register
Reflects the corresponding condition of the E4990A (e.g., occurrence of an
event) as a bit status. These bits continuously monitor changes in the
E4990A's state and change the bit status when the condition (e.g., change
bit status to "1" if a specific event occurs) for each bit is met. You cannot
change the bit status by issuing a SCPI command.
Enable Register
Setting the enable register allows you to specify event register bits that
can set "1" to the summary bit of the status byte register when an event
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