118 Chapter 3
Programming the Status Register System
Accessing Status Register Information
Accessing Status Register Information
1. Determine which register contains the bit that reports the condition. Refer to Figure 3-1 on page 115 or
Figure 3-2 on page 116 for register location and names.
2. Send the unique SCPI query that reads that register.
3. Examine the bit to see if the condition has changed.
Determining What to Monitor
You can monitor the following conditions:
• current signal generator hardware and firmware status
• whether a particular condition (bit) has occurred
Monitoring Current Signal Generator Hardware and Firmware Status
To monitor the signal generator’s operating status, you can query the condition registers. These registers
represent the current state of the signal generator and are updated in real time. When the condition
monitored by a particular bit becomes true, the bit sets to 1. When the condition becomes false, the bit resets
to 0.
Monitoring Whether a Condition (Bit) has Changed
The transition registers determine which bit transition (condition change) should be recorded as an event.
The transitions can be positive to negative, negative to positive, or both. To monitor a certain condition,
enable the bit associated with the condition in the associated positive and negative registers.
Once you have enabled a bit via the transition registers, the signal generator monitors it for a change in its
condition. If this change in condition occurs, the corresponding bit in the event register will be set to 1.
When a bit becomes true (set to 1) in the event register, it stays set until the event register is read or is
cleared. You can thus query the event register for a condition even if that condition no longer exists.
The event register can be cleared only by querying its contents or sending the *CLS command, which clears
all event registers.
Monitoring When a Condition (Bit) Changes
Once you enable a bit, the signal generator monitors it for a change in its condition. The transition registers
are preset to register positive transitions (a change going from 0 to 1). This can be changed so the selected
bit is detected if it goes from true to false (negative transition), or if either transition occurs.
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