Serial bus analysis
R&S
®
RTM3000
283User Manual 1335.9090.02 ─ 09
"Pattern"
Triggers on a data pattern at a specified position.
The pattern setup consists of the "Symbol Offset" on page 283, the
"Numb. of Symb." on page 283, and the "Data" on page 283.
"Any Symbol"
Triggers on a pattern that occurs in one symbol at any position in a
frame.
See "Data" on page 283.
Remote command:
TRIGger:A:UART:MODE on page 632
Symbol Offset
Sets the number of symbols at the beginning of the package to be ignored before the
serial pattern. The first symbol of interest is the first byte after the offset symbols.
The minimum offset is 0 symbols, the maximum offset is 4,095 symbols.
Remote command:
TRIGger:A:UART:POFFset on page 634
Numb. of Symb.
Sets the number of symbols (full bytes) you want to trigger on. The minimum is 1 sym-
bol, a maximum of 4 symbols is possible.
Note: Entering data bits beyond the specified length of the pattern automatically
adjusts the "Number of Bytes" to include all specified bytes.
Remote command:
TRIGger:A:UART:PLENgth on page 633
Data
Specifies the data pattern if "UART Trigger" is set to "Pattern" or "Any Symbol".
An example of pattern definition is shown in Figure 13-19.
To enter the binary value of any bit, tap this bit. To enter the hexadecimal value, tap
one of the nibbles (half byte) in the lower data line.
If a nibble (half byte) contains 1, 2 or 3 "X" bits (don't care), the nibble value is repre-
sented by the character "$". If all 4 bits of a nibble are "X", the nibble itself is "don't
care", represented by the character "X".
Remote command:
TRIGger:A:UART:PATTern on page 633
13.4.4 UART decode results
When the configuration of the serial bus is complete, the signal can be decoded:
1. In the "Bus" menu, enable "Decode".
2. In the "Display" menu, select the result display settings.
See Chapter 13.1.2, "Displaying decode results", on page 253.
3. In the "Bus Table" menu, enable the "Bus Table". Adjust the table settings.
See also: Chapter 13.1.3, "Bus table: decode results", on page 254
UART / RS232 (option R&S
RTM-K2)
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