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12.1 UART (RS232/RS422/RS485) Bus Trigger and Decode
For correctly decoding UART(RS232/RS422/RS485) bus data and making trigger stable, the bus configuration,
trigger mode setting and trigger level need to be adjusted.
Bus configuration
Left swipe or to open the bus configuration menu, as shown in Figure 12-4. The RX channel must
be chosen and the following parameters must be set according to measured signals:
Idle Level — Choose Idle Low or Idle High to match the idle state of measured equipment. For RS232, Idle
Low may be chosen.
Note: RS232 industry standard uses “negative logic”, namely high level is logic “0” and low level is logic
“1”.
Parity Bit — Choose odd, even or none depending on measured equipment.
Word Length — Set the number of bits in UART word to match measured equipment (5-9 bits available).
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