User Manual

Protocol Analysis
R&S
®
Scope Rider RTH
184User Manual 1326.1578.02 ─ 08
Bit Order
Defines if a word starts with MSB (most significant bit) or LSB (least significant bit).
The display of the decoded signal considers this setting, results are displayed in the
specified order.
Remote command:
BUS:UART:ORDer on page 396
Frame Mode
Allows you to decode frames of several words in the data stream, which are defined by
a timeout between a stop bit and the next start bit. Enter the minimum timeout between
two frames in "Idle Time".
Remote command:
BUS:UART:FRAMemode on page 396
BUS:UART:TOUT on page 396
8.4.3 UART Trigger Settings
Access: "Bus" menu > "Bus Protocol" = "UART" > "Trigger"
UART Trigger
Selects the trigger type for UART analysis.
"Start Bit"
Triggers on a start bit. The start bit is the first low bit after a stop bit if
polarity is idle high.
"Frame Start"
Triggers on the begin of a data frame. The frame start is configured
with BUS:UART:FRAMemode.
"Data"
Triggers on a serial pattern or data word. You can define the Pattern
and Relation.
"Parity Error"
Triggers on a parity error, which indicates a transmission error. This
trigger type is only available if a parity is configured for the UART
bus.
"Stop Error"
Triggers if the stop bit is a logic 0.
"Break Condi-
tion"
Triggers if a start bit is not followed by a stop bit, and the data line
remains at logic 0 for longer than a UART word.
Remote command:
TRIGger:UART:TYPE on page 396
Pattern
Specifies the data pattern to be found on the specified trigger source, in binary or hex
format. Enter the words in MSB first bit order.
See also Chapter 2.5.12.1, "Pattern Definition", on page 66.
Remote command:
TRIGger:UART:DATA on page 397
UART/RS-232/RS-422/RS-485 (Option R&S RTH-K2)