Serial bus analysis
R&S
®
RTM3000
253User Manual 1335.9090.02 ─ 09
See Chapter 13.1.3, "Bus table: decode results", on page 254.
Label
Opens a menu to define a label for the selected bus.
See Chapter 13.1.4, "Bus labels", on page 256.
13.1.2 Displaying decode results
When the configuration of a serial bus is complete, the instrument can decode the sig-
nal. The decode results are displayed in two ways:
●
Bus signal with combs, time-correlated to the input signals. The combs show the
values of the frames or words.
●
Bus table. The table lists data values and time information of the frames or words.
For details, see Chapter 13.1.3, "Bus table: decode results", on page 254.
To decode a serial bus
► In the "Bus" menu, enable "Decode".
The bus signal with combs is shown. The colors of the combs are protocol-specific
and described in the "Decode Results" chapters of the protocol description.
To adjust scaling and position of the decoded bus signal
1. The horizontal size of the combs is defined by the horizontal time scale, which is
the same for input signals and the bus signal. Turn the horizontal [Scale] knob to
change the time scale.
2. To adjust the trigger position, turn the horizontal [Position] knob.
3. The vertical size and position are specific for the selected bus signal.
a) Tap the bus signal to set the focus to it.
b) Turn the vertical [Scale] knob to set the height of the combs.
c) Turn the upper knob in the Vertical section to move the bus signal vertically on
the screen.
d) To set the signal to the center of the display, press the upper knob in the Verti-
cal section.
Remote commands
●
BUS<b>:DSIZe on page 606
●
BUS<b>:POSition on page 606
To set the data format and bit display
1. Press the [Protocol] key.
2. Select "Display Setup".
Basics of protocol analysis
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