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AS-Interface Analyser
can be released thus by each of these conditions. A temporal sequence can be
created by activating several trigger levels.
5.7.4.3
Trigger Output
The analyser can be used in order to trigger external devices. So for example a
memory oscilloscope can be triggered by an error in the net. In this case exactly
the analog signal which caused an error on the AS-Interface line can be represen-
ted. Another application is controlling a camera.
For the definition of the trigger conditions a mask just as build as the mask for
the internal trigger is available under "Options / Trigger Output". It also offers
three trigger levels.
The trigger output switches for approx. 150 µs from +5 V to 0 V when the trigger
condition is reached. It responds approx. 450 µs after the trigger event. Its maxi-
mum current load is 2 mA. The potential of the trigger output corresponds to the
potential of the RS232 interface. The trigger output uses the trace mode and the-
refore, only works when a trace runs.
As long as the trigger and the trace are active, a trigger output impulse is set with
each occurrence of the trigger condition. If the trigger event reappears the trigger
is set again. So for example cyclical measurements become possible.
5.7.5
Trace with Recording Filter
With a recording filter the number of captured telegrams is limited. Furthermore the
evaluation is more clearly arranged and the possible recording time is drastically
extended eventually. For the definition of the filter conditions a mask just as build
as the mask for the Internal trigger is available under "Options / Trace Recording
Filter". The same rules and adjusting help apply as in the mask for the internal trig-
ger.
Fig 14: It is specified in the recording filter which data packets are stored. in the example only
calls with incorrect telegrams and missing telegrams are stored.
Subject to reasonable modifications due to technical advances.
31
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Functions of the Analyser
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