Connect-Tek USB-2 Spécifications télécharger pdf (Page 395)

Status and Events

The oscilloscope provides a status and event reporting system for the Ethernet,

GPIB (with the TEK-USB-488 Adapter), and USB interfac es. This system

informs you o

f certain signiﬁcant events that occur within the oscilloscope.

The oscilloscope status handling system consists of ﬁve 8-bit registers and two

queues for e

ach interface. The remaining Status subtopics describe these registers

and components. They also explain how the event handling system o perates.

Registers

Overview

The registers in the event handling system fall into two functional groups:

Status R

egisters contain information about the status of the oscilloscope.

They include the Standard Event Status Register (SESR).

Enable

Registers determine whether selected types of events are reported to

the Status Registers and the Event Queue. They include the Device Event

Status Enable Register (DESER), the Event Status Enable Register (ESER),

and the Service Request Enable Register (SRER).

Status Registers

The Standard Event Status Register (SESR) and the Status Byte Register (SBR)

record certain types of events that may occur while the o scilloscope is in use.

IEEE Std 4 88.2-1987 deﬁnes these registers.

Each bit in a Status Register records a particular type of event, such as an execution

error or message available. When an event of a given type occurs, the oscilloscope

sets the b it that represents that type of event to a value of one. (You can disable

bits so that they ignore events and remain at zero. See Enable Registers). Reading

e status registers tells you what types of e vents have occurred.

The Standard Event Status Register (SESR). The SESR records eight types of

events that can occur within the oscilloscope. Use the *ESR? query to read the

SESR register. Reading the register clears the bits of the register so that the

NOTE. TekVISA applications use SESR bit 6 to respond to any of several events,

including some front panel a ctions.

Figure 3-1: The Standard Event Status Register (SESR)

MSO2000B, DPO2000B, MSO2000 and DPO2000 Series Oscilloscopes Programmer Manual 3-1

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Connect-Tek USB-2 Spécifications Page 395