Micsig SATO1004 - Uart (Rs232;Rs422;Rs485) Bus Trigger and Decode

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13.1 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 13-4. 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).