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AS-Interface Analyser
5.7.1
Contents of a Trace
Fig. 11 shows a small cut-out from a trace with approx.
256.000 lines. Each line of the trace consists of the "data pak-
ket" of a pair of telegrams.
In the first detail the continuous number of the data packet wi-
thin the trace is indicated, then the time, which elapsed up to
the next represented pair of telegrams. It follows the slave
address, the master call as text and as bit pattern (without
address), the length of the pause between master-call and sla-
ve response, the answer telegram of the slaves and the dia-
gnosis as plain text.
In the status line (to be activated in the menu under "View") the
sum of all times between the red underlined line and cursor
marked line is indicated. Without using the trigger function the
first line of the Trace is marked red. Using the trigger the trigger
time is marked red.
The output bits which are contained in a master data call al-
ways appear in the trace on the AS-Interface level (see chap-
ter 5.3.1). For the meaning of each individual bit see the AS-
Interface specification.
5.7.2
Complete Tracing
With the complete trace each individual telegram on the AS-In-
terface line is captured and stored. The memory stores approx.
256.000 master and slave telegrams from the moment of star-
ting the trace. It corresponds to a cycle time of approx. 40 s
(extension see below).
After reaching this value or after a stop of the recording the te-
legrams are loaded automatically into the notebook, as shown
in fig. 11.
For the representation of a complete trace a complete setting
of the recording filter and the view filter is necessary (see the-
re).
5.7.3
Manual Start: Trace without a Trigger
Basically each trace process is started from a query window
(fig. 12) which opens with the call of a trace (under Measure
"Trace" or with the button "TR"). In this window also the pro-
gress is indicated. The trace procedure and/or the following
downloading of the trace into the PC can be aborted in this win-
dow at any time.
Subject to reasonable modifications due to technical advances.
27
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Functions of the Analyser
If adopting a recording filter (see below)
some lines of the trace are needed inter-
nally, to record the periods between indi-
vidual lines. In the practical experience,
therefore, often somewhat less than
256.000 lines are available for a trace.
s
Fig 12: The starting mask
of the Trace Mode
shows the momen-
tary operation and
progress.
Printed in Germany
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