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Protocol analysis
R&S
®
MXO 4 Series
309User Manual 1335.5337.02 ─ 05
Polarity
Defines the logic levels of the bus. The idle state corresponds to a logic 1. The start bit
corresponds to a logic 0. "Idle high" (high=1) is used, for example, for control signals,
while "Idle low" (low=1) is defined for data lines (RS-232).
Remote command:
SBUS<sb>:UART:POLarity on page 630
Bit rate
Sets the number of transmitted bits per second.
Remote command:
SBUS<sb>:UART:BITRate on page 628
Stop bits
Sets the number of stop bits: 1 or 1.5 or 2 stop bits are possible.
Remote command:
SBUS<sb>:UART:SBIT on page 631
Data bits
Sets the number of data bits of a word in a range from 5 bits to 8 bits. If no parity bit is
used, then 9 data bits are possible.
Remote command:
SBUS<sb>:UART:SSIZe on page 631
Parity
Defines the optional parity bit that is used for error detection.
"None"
No parity bit is used.
"Odd"
The parity bit is set to "1" if the number of data bits set to "1" is even.
"Even"
The parity bit is set to "1" if the number of data bits set to "1" is odd.
"Mark"
The parity bit is always a logic 1.
"Space"
The parity bit is always a logic 0.
"Don't care"
The parity is ignored.
Remote command:
SBUS<sb>:UART:PARity on page 629
Packets
Allows you to define packets of several words in the data stream.
"None"
Packets are not considered.
"End word"
Defines a pattern as end condition of a packet, for example, a
reserved word like CR or LF. The bit pattern editor provides frequently
used values in the "Predefined values" list below the pattern table.
A new packet starts with the first start bit after the defined end pat-
tern.
"Timeout"
Defines a timeout between a stop bit and the next start bit. Enter the
minimum time that marks the end of a packet.
A new packet starts with the first start bit after the timeout.
UART (option R&S MXO4-K510)
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