Rohde & Schwarz R&S RTB2000, User Manual

Page: 242 / 609

Serial bus analysis
R&S
®
RTB2000
242 User Manual 1333.1611.02 ─ 11
6. 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 12-19: 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. The 1 st nibble has the binary value 1000 and the 2 nd nibble is repre-
sented 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
Source .........................................................................................................................242
UART Trigger .............................................................................................................. 242
Symbol Offset ..............................................................................................................243
Numb. of Symb. .......................................................................................................... 243
Data .............................................................................................................................243
Source
Selects the transmitter or receiver line as trigger source.
Remote command:
TRIGger:A:SOURce:UART
on page 493
UART Trigger
Selects the trigger condition.
"Start Bit" Sets the trigger to the start bit. The start bit is the first logical 0 after a
stop bit.
"Frame Start" Sets the trigger to the beginning of a frame. The frame start is the first
start bit after the idle time.
"Frame Error" The instrument triggers, if a frame error occurs.
"Symbol <n>" Sets the trigger to the specified symbol - the n-th word - in a frame
(package). Specify the
"Symbol Offset" on page 243.
"Break" Triggers if a start bit is not followed by a stop bit, the data line
remains at logic 0 for longer than a UART word.
UART / RS232 (option R&S RTB-K2)