Configuration Aspects for Programmers

Appendix B

 

 

In order for an acquisition to take place, the unit must have a trigger event and can be assigned a Stop Event. This allows different stimuli to begin and end an acquisition.

Note: If the trigger start event is level or alarm, at least one pre-trigger scan must be programmed to initiate scanning in order for ChartScan to recognize the event.

External TTL (High or Low Level)

Start and/or Stop Event. When External TTL Level is specified as a trigger source (T6 or T7), a TTL level signal on the external trigger connector (rear panel BNC) will generate a trigger. The external trigger is level sensitive, and triggering on the high level or low level can be specified.

Selected Temperature Channel (High or Low Level)

Start and/or Stop Event. When a selected channel is specified, data collection starts when the level for the selected channel has been crossed (either high level or low level) as the user defined with the L command.

GET

Note: GET is not applicable to RS-232 applications.

Start and/or Stop Event. When GET is selected as the trigger source (T2), data collection starts whenever the IEEE488 Group Execute Trigger (GET) command is sensed on the IEEE 488 bus and ChartScan is addressed to

LISTEN.

TALK

Note: TALK is not applicable to RS-232 applications.

Start and/or Stop Event. When TALK is selected as the trigger source (T3), data collection starts when ChartScan is addressed to TALK.

‘@’ character

Start and/or Stop Event. When @ is selected as the trigger source, the command trigger (“@”) generates a trigger when the Trigger Source is set for a command trigger (T1).

Alarm (on or off)

Start and/or Stop Event. When alarm is selected as a trigger source, the acquisition will start or stop when any channel goes into or out of an alarm condition.

Absolute time

Start and/or Stop Event. When absolute time is specified, data collection starts when the real time clock time of day equals the programmed time.

Count (post-trigger)

Start and/or Stop Even. When count is selected as the Stop Event, scans are collected until the specified number of post-trigger scans (specified by the Y command) have been collected, at which time the post-trigger Acquisition will stop and the post-stop Acquisition will begin, if configured.

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ChartScan User’s Manual

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Omega Vehicle Security 1400 External TTL High or Low Level, Selected Temperature Channel High or Low Level, ‘@’ character

1400 specifications

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