User Manual

Protocol Analysis
R&S
®
Scope Rider RTH
186User Manual 1326.1578.02 ─ 08
Figure 8-15: Comb display of a decoded UART signal, triggered on parity error
The color-coding of the various protocol sections and errors simplifies the interpretation
of the visual display.
Table 8-5: Color codes of decoded UART signals
Color, display element Description
Green brackets [...] Start and end of frame
Cyan comb Data words
Violet comb Parity bit
Red Start error, stop error, parity error, or insufficient frame (end of acquisition
before decoding has been completed)
In "Protocol" mode, decoded data is shown in tabular form.
Table 8-6: Content of the protocol table for decoded UART signal
Column Description
# Frame index
Frame Start Time of frame start
Value <x> bit [format] Value of the data word. The data format is selected in the "Bus" menu. The
column header indicates the selected word length.
State Overall state of the frame.
"Incomplete" indicates that the frame is not completely contained in the
acquisition. Change the time scale to get a longer acquisition.
Remote commands are described in Chapter 14.11.4.3, "UART Decode Results",
on page 397.
UART/RS-232/RS-422/RS-485 (Option R&S
RTH-K2)