4 - Programming Examples OFFSET = -4096 4096 DATA POINTS OFFSET = -2048 4096 DATA POINTS OFFSET = 0 4096 DATA POINTS OFFSET = 0 to 2 9 4096 DATA POINTS TIME ACQUISITION TRIGGER Figure 4-4. Pre-event and Post-event Triggering Programming the Status Registers You can use status register programming to determine the operating condition of the ac source at any time. For example, you may program the ac source to generate an interrupt (assert SRQ) when an event such as a current limit occurs. When the interrupt occurs, your program can then act on the event in the appropriate fashion. Figure 4-5 shows the status register structure of the ac source. Table 4-1 defines the status bits. The Standard Event, Status Byte, and Service Request Enable registers and the Output Queue perform standard GPIB functions as defined in the IEEE 488.2 Standard Digital Interface for Programmable Instrumentation. The Operation Status, Questionable Status, and Questionable Instrument Isummary Status registers implement functions that are specific to the ac source. Power-On Conditions Refer to the *RST command description in Chapter 3 for the power-on conditions of the status registers. Operation Status Group The Operation Status registers record signals that occur during normal operation. The group consists of the following registers: Register Condition Command STAT:OPER:COND? PTR Filter STAT:OPER:PTR <n> 142 Description A register that holds real-time status of the circuits being monitored. It is a read-only register. A positive transition filter that functions as described under STAT:OPER:NTR|PTR commands in Chapter 3. It is a read/write register.