Owon XDS4000 Series User Manual page 56

indicates that trigger type is UART/RS232, CH1 trigger level is 1.80V.
Format as shown in the figure below,
UART/RS232 Trigger menu list:
MENU SETTING
Bus Type
Source
Input
Polarity
When
Chk Error
Configure
4.Advanced User Guidebook
UART/RS232 Trigger
INSTRUCTION
Set
UART
UART/RS232 trigger.
CH1 Select CH1 as the trigger source.
CH2 Select CH2 as the trigger source.
CH3 Select CH3 as the trigger source.
CH4 Select CH4 as the trigger source.
Normal Select polarity of data transmission as
Normal. Select polarity of data
Inverted
transmission as Inverted.
Trigger on the start frame of position. After
Start choosing this condition, press Configure to
enter detailed settings.
Trigger when error frame is detected. After
Error choosing this condition, press Configure to
enter detailed settings.
Trigger when Chk Error is detected. After
choosing this condition, press Configure to
enter detailed settings.
Trigger on the last bit of the preset data.
Data After
Configure to enter detailed settings.
Common Baud: adjust M knob to choose
common baud.
Start
Custom Baud: adjust M knob to choose
baud, ranges from 50 to 10,000,000.
Stop Bit：Select "1"or "2".
Parity: "NO""EVEN""ODD"
Common Baud: adjust M knob to choose
Error
common baud.
Custom Baud: adjust M knob to choose
baud, ranges from 50 to 10,000,000.
vertical channel
choosing this
50
bus type as
condition, press