Master Lock XR20 Wartungshandbuch PDF herunterladen (Seite 86)

273.0E-2

<NRf> Extended format that includes <NR1>, <NR2> and <NR3>. 273

-273.0

2.73E2

<NRf+> Expanded decimal format that includes <NRf>, MIN, and

MAX

273

-273

2.73E2

MIN

MAX

4.4 IEEE-488 Event Processing

All of the SCPI subsystem commands in the previous section can be initiated using RS232,

optional IEEE-488, or optional Ethernet communications.

The IEEE-488 standard defines a method for status reporting. As illustrated in figure 4.1, the

method uses the IEEE-488.1 Status Byte (STB). Three bits of this byte are defined as: Master

Status Summary (MSS) Bit, Event Status Bit (ESB), and Message Available (MAV) Bit.

The Master Status Summary (MSS) is an unlatched bit. When the Status Byte Register is read

using a Status Byte Register query (discussed in Section 4.5.4), bit 6 will be 1 if there are any

conditions requiring service.

The STB is masked by the Service Request Enable Register (SRE) to allow the user to mask

specific or all events from setting the MSS bit to 1. The MSS bit is obtained by logical OR’ing

the bits of the enabled Status Byte Register.

The Event Status Bit (ESB) is set when one of the events defined in the Event Status Register

(ESR) (see Table 4.6) has occurred. As shown in figure 4.2 and like the STB, the ESR is masked

by the Event Status Enable Register (ESE) to allow the user to mask specific or all events from

setting the ESB to 1.

The Message AVailable (MAV) bit is set to 1 when a message is available in the output buffer.

4.5 IEEE-488 Standard Commands

The following sections describe the IEEE-488 Standard Commands.

4.5.1 Clear

This command clears all status register (ESR, STB and error queue).

Command Syntax: *CLS <>

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Master Lock XR20 Wartungshandbuch Seite 86