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Serial Bus Analysis
R&S
®
RTM3000
276
User Manual 1335.9090.02 ─ 08
"User"
Specifies an individual bit rate with values between 150 and
39,062,500.
Remote command:
Data Size
Sets the number of data bits of a word in a range from 5
bits to 9
bits.
Remote command:
Idle Time
Sets the minimal time between two data frames (packets), that is, between the last
stop bit and the start bit of the next frame.
Remote command:
12.4.3
UART Trigger
Before you set up the trigger, make sure that the bus is configured correctly. See
Chapter 12.4.2, "UART Configuration"
To trigger on UART signals:
1. Press the [Protocol] key in the Analysis area of the front panel.
2. Select the bus that is configured for UART.
3. Select "Trigger".
This selection has several effects:
● Enables decoding, if necessary.
● Sets the "Trigger Type" to "Serial Bus" and the trigger source to the selected
bus.
● Displays the "UART Trigger" condition in the dialog box, below the protocol
setup.
4. In the menu, select the "Source".
5. At "UART Trigger", select the required trigger condition:
● "Start Bit" or "Frame Start": next start bit or first start bit after idle time
● "Frame Start"
● "Frame Error"
● "Symbol
<n>": frame number in a data stream
● "Break": a start bit not followed by a stop bit
● "Parity Error"
● "Pattern": serial pattern of 1, 2, 3 or 4 symbols at a defined position in the data
stream
● "Any Symbol": pattern of data bits anywhere in a data stream
UART / RS232 (Option R&S
RTM-K2)
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