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Serial Bus Analysis
R&S
®
RTB2000
192User Manual 1333.1611.02 ─ 03
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. 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
5. If "Pattern" or "Any Symbol" is selected, the UART trigger setup dialog expands to
define the serial pattern or the symbol.
UART trigger settings
Figure 12-17: Trigger setup dialog with an example of a UART serial pattern
55 =
Hex value of the 1
st
symbol, with the binary value 01010101
E6 =
Hex value of the 2
nd
symbol, with the binary value 11100110
E (blue) =
Selected nibble in the 2
nd
symbol. The blue color indicates that the keypad is active for this nib-
ble.
8$ =
Hex value of the 3
rd
symbol, where the 1
st
nibble has the binary value 1000 and the 2
nd
nibble is
represented by the "$" character, as it includes one "X" bit (don't care)
AX (gray) =
The 4
th
symbol is not contained in the specified pattern
UART Trigger..............................................................................................................193
Symbol Offset..............................................................................................................193
Numb. of Symb........................................................................................................... 193
Data.............................................................................................................................193
UART / RS232 (Option R&S RTB-K2)
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