User manual

Protocol Analysis
R&S
®
Scope Rider RTH
133User Manual 1326.1578.02 ─ 04
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 226
Frame Mode
Allows 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 226
BUS:UART:TOUT on page 226
7.4.3 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.
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.
UART/RS-232/RS-422/RS-485 (Option R&S RTH-K2)