User manual

Protocol Analysis
R&S
®
Scope Rider RTH
131User Manual 1326.1578.02 ─ 04
bits. Several words can form a frame, or package. The end of a frame is marked by a
pause between two symbols.
[Data8]
[Parity]
Stop[Data7][Data6][Data5]
Data4Data3Data2Data1Data0
Start
Figure 7-5: Bit order in a UART word (symbol)
●
The start bit is a logic 0.
●
The stop bits and the idle state are always logic 1.
The UART protocol has no clock for synchronization. The receiver synchronizes by
means of the start and stop bits, and the bit rate that must be known to the receiver.
Trigger
The R&S RTH can trigger on specified parts of UART serial signals:
●
Start bit of a word
●
Frame start
●
Data pattern
●
Parity error
●
Stop error
●
Break
7.4.2 UART Configuration Settings
Access: "Bus" menu > "Bus Protocol" = "UART" > "Config"
Source
Selects the input channel to which the UART line is connected.
If option R&S RTH-B1 is installed, digital channels can also be used as source.
UART/RS-232/RS-422/RS-485 (Option R&S RTH-K2)