Protocol analysis
R&S
®
RTE
553User Manual 1326.1032.02 ─ 20
See also: Chapter 13.1.1, "Decode - general settings", on page 514.
Source: Tx, Rx
Select the input channels for the transmitter and receiver signals.
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.
Do not combine a reference waveform with channel or math waveform because the
time correlation of these waveforms might differ.
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>:UART:TX:SOURce on page 1478
BUS<m>:UART:RX:SOURce on page 1478
Threshold
Sets the threshold value for digitization of signals for each line. If the signal value on
the line is higher than the threshold, the signal state is high. Otherwise, the signal state
is considered low if the signal value is below the threshold. The interpretation of HIGH
and LOW is defined by the Polarity.
There are several ways to set the threshold:
●
"Threshold"
Enter the value directly in the field.
●
"Full autoset"
Starts software algorithms for determining the signal threshold levels and bitrate.
●
"Auto thresholds"
Executes the measurement of reference levels and sets the thresholds to the mid-
dle reference level of the measured amplitude.
●
"Preset thresholds"
Selects the default threshold voltage for various signal technologies from a list. The
value is set to "Manual" if the threshold was set with "Auto threshold", or was
entered directly.
Note: If the sources are digital channels, the same threshold values are used for the
parallel and the serial buses. You can set the thresholds either in the parallel bus con-
figuration or in the serial bus configuration.
"Threshold"
Enter the value directly in the field.
"Full autoset"
Starts software algorithms for determining the signal threshold levels
and bitrate.
"Auto thresh-
olds"
Executes the measurement of reference levels and sets the thresh-
olds to the middle reference level of the measured amplitude.
"Preset thresh-
olds"
Selects the default threshold voltage for various signal technologies
from a list. The value is set to "Manual" if the threshold was set with
"Auto thresholds", or was entered directly.
UART/RS-232/RS-422/RS-485 (option R&S RTE-K2)
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