User manual

Protocol Analysis
R&S
®
RTO
308User Manual 1316.0827.02 ─ 06
Source type
Sets the type of measurement. The instrument adjusts the thresholds to the selected
source type.
"Single-ended"
For measurements with single-ended probes, or single-ended voltage
measurements with differential probes on the FlexRay bus. Two thresh-
olds have to be defined as absolute voltage levels.
"Differential"
For differential measurements on the FlexRay bus. This is the most
common measurement. Two thresholds have to be defined as differ-
ential voltages.
"Logic"
For measurements of the logic signal inside the FlexRay node, between
the communication controller and the bus driver. It is possible to mea-
sure simultaneously on a data line and on the enable line. Each line
requires its own threshold.
SCPI command:
BUS<m>:FLXRay:SRCType on page 717
Data
Sets the input channel of the bus signal, or of the data line in case of a "Logic" source
type. Waveform 1 of channel signals, math waveforms, and reference waveforms can be
used for decoding. For triggering on a serial bus, a channel signal is required.
SCPI command:
BUS<m>:FLXRay:SOURce<n> on page 718
Enable
Sets the input channel of the enable line in case of a "Logic" source type. None, waveform
1 of channel signals, math waveforms, and reference waveforms can be used for decod-
ing. For triggering on a serial bus, a channel signal is required.
The enable line transfers the control signal of the bus guardian to the bus driver.
SCPI command:
BUS<m>:FLXRay:SOURce<n> on page 718
Thresholds
Threshold values are used for digitization of the signal.
For measurements on a FlexRay bus, two thresholds are required to distinguish the three
possible states of the signal - high, low and idle. If the signal value on the line is higher
than the upper threshold, the signal state is high. Otherwise, the signal state is considered
low if the signal value is below the lower threshold. If the value is between the threshold,
the signal is in idle state.
FlexRay (Option R&S RTO-K4)