Appendix AAPI Commands

 

 

 

M

- Set SRQ Mask

 

 

 

 

 

 

 

 

 

 

 

TYPE

System

 

 

 

 

 

 

EXECUTION

Deferred

 

 

 

 

 

 

SYNTAX

Mmask

Use the IEEE 488 Service Request (SRQ) mechanism to inform the

 

 

 

IEEE 488 bus controller of certain conditions, where mask is in the form of

 

 

 

the number nnn such that 000 < nnn < 255 is summed from the

 

 

 

following conditions:

 

 

 

 

 

 

000

- Power-on default mask value

008

- SRQ On Scan Available

 

 

 

001

- SRQ On Alarm

016

- SRQ On Message Available

 

 

 

002

- SRQ On Trigger Event

032

- SRQ On Event Detected

 

 

 

004

- SRQ On Ready

128

- SRQ On Buffer Overrun

 

 

M?

Query the SRQ mask.

 

 

 

 

DESCRIPTION

 

 

 

 

 

 

The Set SRQ Mask (M) command uses the IEEE 488 Service Request (SRQ) mechanism to inform the IEEE 488 bus controller of the existence of several conditions in the Service Request Enable (SRE) Register. These conditions are described in detail below. Multiple conditions can be enabled simultaneously. If multiple conditions are contained within the same command string, each Set SRQ Mask command should be proceeded by an Execute (X) command. The resulting SRQ Mask register value is the logical ORed value of the individual values sent. Alternately, the entire value of all the desired conditions may be sent within one Set SRQ Mask (M) command string. The programmed SRQ Mask remains enabled until the receipt of a M000 command or the detection of a Device Clear (DCL) or Selected Device Clear (SDC).

The following list outlines the possible conditions of the SRE:

M000: This is the power-on default mask value. It disables the unit from generating service requests by clearing the entire mask of the Service Request Enable (SRE) Register to zero.

M001: SRQ On Alarm. Sending this command will enable the unit to generate an SRQ when it has recognized that one or more channels has gone into alarm condition. Refer to the Configure Channels (C) command on how to configure an alarm condition.

M002: SRQ On Trigger Event. Sending this command allows the unit to generate a service request when it has detected a valid trigger from the programmed trigger source.

M004: SRQ On Ready. This command causes a service request to be generated when the unit has completed executing a set of commands from the IEEE 488 bus controller. This is used to allow the bus controller to attend to other bus matters while the unit is changing its internal state.

M008: SRQ On Scan Available. Sending this command will cause the unit to generate an SRQ when at least one scan is available to be read in the acquisition buffer.

M016: SRQ On Message Available (MAV). Sending this command will cause the unit to generate an SRQ when there is data available in the output queue to be read.

M032: SRQ On Event Detected. Sending this command will cause the unit to generate an SRQ when at least one of the defined events in the Event Status Register has occurred. Refer to the Set Event Mask (N) command on how to define events.

M128: SRQ On Buffer Overrun. Sending this command will cause the unit to generate an SRQ when it has detected that an overrun of the acquisition buffer has occurred.

EXAMPLE

PRINT#1,“OUTPUT07;M0X”

‘ Clear the Service Request Enable (SRE) register

PRINT#1,“OUTPUT07;M1XM2X”

‘ Set the unit to SRQ on Alarm or Trigger

PRINT#1,“OUTPUT07;M?X”

‘ Read the current Service Request Enable (SRE)

 

register

PRINT#1,“ENTER07"

‘ Computer screen shows M003

LINE INPUT #2, M$

 

PRINT M$

 

ChartScan User’s Manual

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Page 166 Page 168
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Image 167
Omega Vehicle Security 1400 manual Set SRQ Mask, Mmask
Page 166 Page 168

1400 specifications

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