Measurement-computing Digital488 Manual do Utilizador descarregar pdf (Página 52)

Section 3 Command Descriptions

3.22

Service Request Mask (SRQ) Mn

The

Service Request

(SRQ)

mode is used by the

Digital488

to alert the

controller to one of several conditions described below. Multiple

SRQ

conditions can

be enabled simultaneously by issuing them sepatately or by combining them in one

command. If multiple

SRQ

commands are contained within the same command string,

each

SRQ

command should be followed by an

Execute

command

(X).

The

programmed

SRQ

modes will remain enabled until the

command is sent, or the

controller sends a Device Clear (DCL), Selected Device Clear (SDC), or Interface Clear

(IFC) command.

SRQ is disabled

SRQ on

Service

input transition

SRQ on

EDR

input transition

SRQ on bus error

SRQ on Self-Test error

M16

SRQ on Ready

default mode disables the

SRQ

function, preventing the

Digital488

from

generating a

Service Request

will generate a

Service Request

when the

Service

Input line makes a

transition. Refer to the

Invert

command

(I64)

description for programming the polarity

of the

Service

input line.

will generate a

Service Request

when the

EDR

input

makes a transition.

Refer to the

Invert

command

(I32)

description for programming the polarity of the

EDR

input line.

will generate a

Service Request

when a bus error occurs. The most

common bus error is sending an invalid command to the

Digital488

. For example,

attempting to select an 'F6' format when no 'F6' format exists will generate a

Service

Request

when the

mode is selected.

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