Tektronix 070-9180-01 Instrukcja Użytkownika Pobierz pdf (Strona 94)

Status and Events

Option 01 VXI Interface Module User Manual

4–5

Status and Event Reporting Process

Figure 4–1 shows how to use the Status and Event Reporting system. In the

explanation that follows, numbers in parentheses refer to the circled numbers in

Figure 4–1.

—

Standard Event Status

Event Status Enable

Read using *ESE?

Write using *ESE

Status Byte

Read using *STB?

Service Request Enable

Read using *SRE?

Write using *SRE

Event

queue

Output

queue

Event

Byte

Power

— Command

Error

Execution

Error

Query

Error

Operation

Complete

—

765 4 3 210

Power

— Command

Error

Execution

Error

Query

Error

Operation

Complete

—

765 4 3 210

Event

Status Bit

Message

Available

queue Not

Empty

—

7543210

——

Master

Status

Request

Service

— Event

Status Bit

Message

Available

—

7543210

——

Read using *ESR?

—

111

Figure 4–1: Status and Event Reporting Process

When an event occurs the appropriate bit in the Standard Event Status register is

set to one and the event is recorded in the Event queue (1). If the corresponding

bit in the Event Status Enable register is also enabled (2), then the event status

bit in the Status Byte register is set to one (3).

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