User manual

Protocol Analysis
R&S
®
Scope Rider RTH
130User Manual 1326.1578.02 ─ 04
Relation
Defines how the defined serial data pattern is compared with the acquired signal. The
instrument triggers if the acquired data word is equal or unequal the defined pattern.
Bit Offset
Sets the number of bits before the first bit of the pattern. These bits are ignored. The
first bit after CS or timeout is bit 0. For example, with bit offset = 2, bit 0 and bit 1 after
CS are ignored, and the pattern starts with bit 2.
Chip Select
Defines if the SPI bus uses a chip select line or not.
7.4 UART/RS-232/RS-422/RS-485 (Option R&S RTH-K2)
7.4.1 The UART Interface
The Universal Asynchronous Receiver/Transmitter UART converts words of data into
serial data, and vice versa. It is the base of many serial protocols like of RS-232 and
RS-422. The UART uses only one line, or two lines for transmitter and receiver. The
R&S RTH can analyze one UART line.
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
UART/RS-232/RS-422/RS-485 (Option R&S RTH-K2)