Protocol analysis
R&S
®
RTE
880User Manual 1326.1032.02 ─ 20
Usually, the source is one of the analog channels. Reference and math waveforms are
available as source if the trigger source is one of the analog channels but not the serial
bus.
Alternatively, digital channels can be used if MSO option R&S RTE-B1 is installed. Dig-
ital and analog channels cannot be used at the same time.
For triggering on a serial bus, analog or digital channel sources are required.
Remote command:
BUS<m>:CXPI:SDATa on page 1875
Polarity
Selects if the polarity of the transmitted waveform is normal (high = 1) or inverted (low
= 1).
Remote command:
BUS<m>:CXPI:POLarity on page 1874
Threshold
Sets the threshold value for digitization of the signal. If the signal value on the line is
higher than the threshold, the signal state is high. If the signal value on the line is
below the threshold, the signal state is low. The interpretation of high and low is
defined by the Polarity.
There are two ways to set the threshold:
"Threshold"
Enter the value directly in the field.
"Auto thresh-
olds"
Executes the measurement of reference levels and sets the thresh-
olds to the middle reference level of the measured amplitude.
Remote command:
BUS<m>:CXPI:THReshold on page 1875
BUS<m>:SETReflevels on page 1421
Hysteresis
Sets a value for the hysteresis.
The hysteresis is applied as ("Threshold" +"Hysteresis") and ("Threshold" - "Hystere-
sis").
Remote command:
BUS<m>:CXPI:HYSTeresis on page 1874
Display order
Selects the order in which the signal is displayed in the honeycomb.
"As transmitted"
The signal is displayed in the order it occurs.
"Logical"
The signal is displayed according to the definition of the standard
(MSB bit order).
Remote command:
BUS<m>:CXPI:DORD on page 1874
CXPI (option R&S
RTE-K76)
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