Trigger setups Set up a Comm trigger
Behavior
Use this trigger to analyze CAN_H or CAN_L bus data frames with single-ended probes, or use a
differen
tial probe to read both signals simultaneously.
NOTE. For low-speed Serial triggering on data streams, the instrument implicitly pads the MSB side of the
entered v alue, up to the next byte, with "don't care" values (X). To trigger on a two-byte message, y ou must
enter don't care values explicitly up to the desired size.
For example, a binary entered value of 01 is equivalent to XXXX XX01, whereas a two-byte message
would be entered as XXXX XXXX XXXX XX01.
Set up a Comm trigger
From the Trig menu, select Comm Setup.
NOTE. The Comm Trigger is designed to work with communications mask and standard testing. Mask
testing automatically uses Communication triggers. You must install the Serial Communications Mask
Testing Option (see page 209) on some instruments before you can access the Comm triggers.
Overview
U
se the controls in this window to select the trigger source, coding format, and standard for
communications testing.
NOTE. The Comm trigger is only available on analog channels.
DSA/DPO70000D, MSO/DPO/DSA70000C, DPO7000C, and MSO/DPO5000 Series 421
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