User Manual

Protocol Analysis
R&S
®
Scope Rider RTH
182User Manual 1326.1578.02 ─ 08
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The start bit is a logic 0.
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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:
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Start bit of a word
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Frame start
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Data pattern
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Parity error
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Stop error
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Break
8.4.2 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.
Remote command:
BUS:UART:SOURce on page 393
Polarity
Defines the logic states of the line. In idle high state, the idle state corresponds to a
logic 1, and the start bit to a logic 0. In idle low state, the idle state corresponds to a
logic 0, and the start bit to a logic 1. During idle time, no data is transmitted.
UART/RS-232/RS-422/RS-485 (Option R&S RTH-K2)