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3. RS232 trigger
RS232 is a serial communication type used for data transmission between PC and terminal. A character is
transmitted as a frame of data consisting of 1 start bit, 5-8 data bits, 1 check bit and 1-2 stop bits.
In RS232 trigger mode, the setting information is displayed at the bottom right of the screen, e.g.:
indicates that the trigger is in RS232 mode and the trigger level of CH1 is 0.00mV.
Menu
Setting
Description
Bus Type
RS232
Set vertical bus type as RS232 triggering
Input
Source
CH1
Set CH1 as SCL or SDA
Set CH2 as SCL or SDA
CH2
Polarity
Normal
Set the polarity of the data transmission as Normal
Set polarity of data transmission as Inverted
Inverted
When
Start
Triggers on the start frame position. After selecting this
condition, select Configure for detailed setting options.
Error
Triggers on the error frame position. After selecting this
condition, select Configure for detailed setting options.
Chk Error
Trigger when a Chk Error was found. After selecting this
condition, select Configure for detailed setting options.
Data
Triggers on the last bit of preset data. After selecting this
condition, select Configure for detailed setting options.
Start
Common Baud: Multi ( ) to select common baud
Custom Baud: Multi ( ) knob to select custom baud, range
from 0 to 10000000 possible.
Error
Stop bit: Select 1 or 2
Parity: "No", "Even" or "Odd
Common Baud: Multi ( ) to select common baud
Custom Baud: Multi ( ) knob to select custom baud, range
from 0 to 10000000 possible.
Chk Error
Even-Odd: Select Even or Odd
Common Baud: Multi ( ) to select common baud
Custom Baud: Multi ( ) knob to select custom baud, range
from 0 to 10000000 possible.
Data
Data Bits: Set 5, 6, 7 or 8 bits
Data: Set associated data bits from 0-31, 0-63, 0-127 or 0-
255.
Fashion
Holdoff
Car
Normal
Single
Capture waveform even if no trigger occurs
Capture waveform when a trigger occurs.
When trigger occurs capture a wave and then stop it