Rohde & Schwarz RTM3K-COM2

Serial bus analysis
R&S
®
RTM3000
277User Manual 1335.9090.02 ─ 09
Figure 13-16: Decoded I2C signal with applied label list and zoom on second frame
13.4 UART / RS232 (option R&S RTM-K2)
● The UART / RS232 interface................................................................................ 277
● UART configuration...............................................................................................278
● UART trigger......................................................................................................... 281
● UART decode results............................................................................................283
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 symbols, also referred to as words or characters. Each sym-
bol consists of a start bit, several data bits, an optional parity bit, and one or more stop
bits. Several symbols 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 13-17: Bit order in a UART word (symbol)
UART / RS232 (option R&S RTM-K2)