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Chapter 5 Remote Interface Reference
Status System Commands
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Each register group has one or more low-level registers. These low-level
registers are called condition, event, or enable registers and control the
action of specific bits in the registers. You read or write to the registers
using binary-weighted decimal numbers.
A condition register continuously monitors the state of the instrument.
The bits in the condition register are updated in real time (they are not
latched). The 3499A/B/C uses a condition register as a part of the
Operation Status Register.
An event register latches events from the condition register. The
3499A/B/C has an event register as a part of the Operation Status
Register and the Standard Event Register.
An enable register defines the bits in the event register that are reported
to the Status Byte Register. You can read or write to an enable register.
You read and write to the Standard Event Register and Status Byte
Register using IEEE488.2 common commands. The Operation Status
Register uses SCPI commands.
You can read the status registers to determine the current operating
state of the instrument. You can use a technique called serial polling to
periodically read the Status Byte Register and determine the operating
state of the instrument. You can also set the status system to generate
an interrupt (on the GPIB SRQ line) when one or more specific events
occur (called SRQ interrupt). Not all GPIB cards support SRQ enabled
interrupts.
*CLS
This command clears all the event registers and the Status Byte register.
It does not affect the enable registers. It also clears the error queue.
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