API CommandsAppendix A

 

 

T -

Set Trigger Configuration

 

 

 

 

 

 

TYPE

Acquisition

 

 

 

EXECUTION

Deferred

 

 

 

SYNTAX

Tstart,

Configure an acquisition of scan data with the following parameters:

 

 

stop,

start is the start event

 

 

re-arm,

stop is the stop event

 

 

sync

re-armdetermines if the unit should continue acquiring after the first

 

 

 

acquisition completes, where 1 is on and 0 is off.

 

 

 

sync determines if acquisition events should be synchronized with the

 

 

 

internal timebases, where 1 is on and 0 is off.

 

 

 

T?

Query the present trigger configuration

 

DESCRIPTION

The Set Trigger Configuration (T) command is the central command which controls how an acquisition is to be configured. Upon execution of this command the unit enters the acquiring mode. This will be indicated on the front panel by the flashing of the TRIGGER light. If a pre-trigger has been configured (via the Y command), then the sampling for pre-trigger data will begin at this time.

Since the Set Trigger Configuration command controls the configuration of an acquisition, all other acquisition dependent commands should be sent before the Set Trigger Configuration command is sent to the unit. The commands which should be sent to the unit prior to the Set Trigger Configuration command will depend on the desired start and/or stop triggers. For instance, if configuring for Trigger on Command, it would not be necessary to send the Set Trigger Level (L) command.

The following table lists the valid trigger types and their associated required prior issue commands.

Start/Stop

Start/Stop Trigger Definition

Pre-Trigger/

Required Prior Issue

Trigger

 

Post Stop

Commands

Type

 

 

 

0

None - Event Not Defined

(N/A)

(N/A)

 

 

(N/A)

(N/A)

1

Trigger on Command(See @ command)

yes

I,Y

 

 

no

I

2

Trigger on GET (IEEE-488 only)

yes

I,Y

 

 

no

I

3

Trigger on Talk (IEEE-488 only)

yes

I,Y

 

 

no

I

4

Trigger on Channel Above Level (L command)

yes

I,Y,L

 

 

no

I,L

5

Trigger on Channel Below Level (L command)

yes

I,Y,L

 

 

no

I,L

6

Trigger on TTL Signal Rising

yes

I,Y

 

 

no

I

7

Trigger on TTL Signal Falling

yes

I,Y

 

 

no

I

8

Trigger on Count (Y command)

—

I,Y

9

Trigger on Alarm Turning On (C command)

yes

I,Y,C,A (A is optional)

 

 

no

I,C,A (A is optional)

10

Trigger on Alarm Turning Off (C command)

yes

I,Y,C,A (A is optional)

 

 

no

I,C,A (A is optional)

11

Trigger on Absolute Time (P command)

yes

I,Y,P

 

 

no

I,P

Note: If the start and stop triggers are of different types, a combination of the start and stop prior issue commands is required.

The Set Trigger Configuration (T) command is used to configure the manner in which scans are to be acquired. It sets the sources to determine when an acquisition is to be initiated and when it is to be terminated. It also determines how these acquisition sources are to be (if at all) synchronized with the internal scan intervals (I) command. Likewise, it may allow the acquisition to re-enable itself (with the same configuration) after the initial acquisition has been terminated.

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ChartScan User’s Manual

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Omega Vehicle Security 1400 manual Set Trigger Configuration
Page 179 Page 181

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