Agilent Technologies Signal Analyzer N9030a - Manual (Page 133)

3 Programming the Analyzer
STATus Subsystem
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The instrument does not have a service request pending. (A service request is considered to be
pending between the time the instrument’s SRQ process is initiated and the time the controller
reads the status byte register.)
The SRQ process sets the SRQ true. It also sets the status byte’s request service (RQS) bit to 1.
Both actions are necessary to inform the controller that the instrument requires service. Setting
the SRQ line only informs the controller that some device on the bus requires service. Setting the
RQS bit allows the controller to determine which instrument requires service.
If your program enables the controller to detect and respond to service requests, it should instruct
the controller to perform a serial poll when the SRQ is set true. Each device on the bus returns the
contents of its status byte register in response to this poll. The device who's RQS bit is set to 1 is
the device that requested service.
When you read the instrument’s status byte register with a serial poll, the RQS bit is reset to 0.
Other bits in the register are not affected.
If the status register is configured to SRQ on end-of-measurement and the measurement is in
continuous mode, then restarting a measurement (INIT command) can cause the measuring bit to
pulse low. This causes an SRQ when you have not actually reached the "end-of-measurement"
condition. To avoid this:
1. Set INITiate:CONTinuous off.
2. Set/enable the status registers.
3. Restart the measurement (send INIT).
Status Register System
The hardware status registers are combined to form the instrument status system. Specific status
bits are assigned to monitor various aspects of the instrument operation and status. See the
diagram of the status system above for information about the bit assignments and status register
interconnections.
Remote Language Compatibility Measurement Application Reference 133