Rohde & Schwarz RTP044 - UART;RS-232;RS-422;RS-485 (Option R&S RTP-K2); The UART; RS232 Interface

Protocol analysis
R&S
®
RTP
546User Manual 1337.9952.02 ─ 12
Remote command:
SEARch:TRIGger:SPI:FCONdition on page 1599
SEARch:TRIGger:SPI:MISopattern on page 1600
SEARch:TRIGger:SPI:MOSipattern on page 1600
SEARch:TRIGger:SPI:DPOPerator on page 1600
SEARch:TRIGger:SPI:DPOSition on page 1600
SEARch:TRIGger:SPI:DPTO on page 1601
SEARch:TRIGger:SPI:PALignment on page 1601
13.3.5.2 SPI search results
To get search results, "Enable" the search. You can minimize, shift or close the search
dialog.
The search results are listed in the search result table and marked in the waveform by
blue lines.
For an introduction to search results, see:
●
Chapter 11.1.2, "Search results", on page 449
●
Chapter 11.4.2, "Display zoom settings", on page 468
Remote commands are listed in Chapter 22.17.4.5, "SPI search results",
on page 1601.
13.4 UART/RS-232/RS-422/RS-485 (option R&S RTP-K2)
13.4.1 The UART / RS232 interface
The Universal Asynchronous Receiver/Transmitter UART converts a word of data into
serial data, and vice versa. It is the base of many serial protocols like of RS-232. The
UART uses only one line, or two lines for transmitter and receiver.
Data transfer
The data is transmitted in words, also referred to as symbols or characters. Each word
consists of a start bit, several data bits, an optional parity bit, and one or more stop
bits. Several words can form a package, or frame. The end of a package is marked
with a reserved word or by a pause between two words.
[Data8]
[Parity]
Stop[Data7][Data6][Data5]
Data4Data3Data2Data1Data0
Start
Figure 13-5: 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.
UART/RS-232/RS-422/RS-485 (option R&S
RTP-K2)