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Sony Tektronix VX4792 User Manual
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VX4792 User Manual This section describes how the VX4792 Arbitrary Waveform Generator reportsits status and internal events. The section describes the elements that comprisethe status and events reporting system and explains how status and events arehandled.The status and event reporting system reports certain significant events thatoccur within the waveform generator. The system consists of five registers plustwo queues. Four of the registers and one of the queues are compatible withIEEE Std. 488.2–1987; the other register and queue are specific to Tektronixproducts.The registers fall into two functional groups: status registers and enable registers. Status registers store information about the status of the waveform generator.They include the Standard Event Status Register (SESR) and the Status ByteRegister (SBR). Enable registers determine whether certain events are reported to the StatusRegisters and the Event Queue. They include the Device Event Status EnableRegister (DESER), the Event Status Enable Register (ESER), and theService Request Enable Register (SRER).The Standard Event Status Register (SESR) and the Status Byte Register (SBR)record certain types of events that may occur while the waveform generator is inuse. The IEEE Std 488.2-1987 defines these registers.Each bit in a Status Register records a particular type of event, such as anexecution error or service request. When an event of a given type occurs, thewaveform generator sets the bit that represents that type of event to a value ofone. (You can disable bits so that they ignore events and remain at zero. See theEnable Registers section on page 4–4.) Reading the status registers tells youwhat types of events have occurred. The SESR is shown in Figure 4–1. Itrecords eight types of events that can occur within the waveform generator. Usethe query to read the SESR register. Reading the register clears the bits ofthe register so that the register can accumulate information about new events. |
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