Measurement-computing Serial488/4 Uživatelský manuál stáhnout pdf (Strana 51)

Section 3 Command Descriptions

3.12

Service Request (SRQ) Mn

The Service Request (SRQ) mode is used by the Serial488/4 to alert the

controller to one of several conditions described below . Multiple SRQ conditions can

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

command. If multiple SRQ commands are contained w ithin the same command

string, each SRQ command should be follow ed by an E xecute command (

). The

programmed SRQ modes will remain enabled until the

command is sent, or the

controller sends a Device Clear (DCL) or Selected Device Clear (SDC). The factory

default setting as set by the Save Configuration command (

) is

, SRQ i s

disabled.

SRQ is disabled

SRQ on receipt of data on serial port 1

SRQ on receipt of data on serial port 2

SRQ on receipt of data on serial port 3

SRQ on receipt of data on serial port 4

M16

SRQ on Ready

M32

SRQ on Error condition

M128

SRQ on Memory low condition

Returns current SRQ mask

default mode disables the SRQ function, preventing the Serial488/4 from

generating a Service Request.

and

will generate a Service Request when the data is received on

serial ports 1, 2, 3, and 4 respectively.

M16

will generate a Service Request w hen the Serial488/4 has completed the

execution of a set of commands from the bus controller. This is used by the controller

to assure the completion of a set of commands before sending a subsequent set of

commands.

M32

will generate a Service Request w hen an error occurs. The most common

bus error is sending an invalid command to the Serial488/4. For example, attempting

to select an '

B15

' baud rate w hen no '

B15

' baud rate exists w ill generate a Service

Request when the

M32

mode is selected.

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