Data Sheet

RIGOL 5 To Trigger the Oscilloscope
MSO4000/DS4000 User’s Guide
5-24
RS232 Trigger
Trigger according to the start frame, error frame, check error or data. Below is the
explanatory figure of RS232 protocol.
Trigger Type:
Press Type to select “RS232”. At this point, the trigger setting information as shown
in the figure below is displayed at the upper right corner of the screen.
Source Selection:
Press Source to select CH1 to CH4 or D0-D15 as the Trigger Source. The current
trigger source is displayed at the upper right corner of the screen.
Trigger Condition:
Press When to select the desired trigger condition.
 Start: trigger on the start frame position.
 Error: trigger when error frame is detected. After this trigger condition is
selected:
--press Stop Bit to select “1 bit” or “2 bit”;
--press Even-OddCheck to select “None”, “Odd Checkout” or “Even Checkout”.
The oscilloscope will determine error frame according to the preset parameters.
 Check Error: trigger when check error is detected. When this trigger condition is
selected, press Even-OddCheck to select “Odd Checkout” or “Even Checkout”.
The oscilloscope will determine check error according to the preset parameters.
 Data: trigger on the last bit of the preset data bits and even-odd check bits.
When this trigger condition is selected:
--press Data Bits to select “5 bit”, “6 bit”, “7 bit” or “8 bit”;
--press Data and input the data value according to the setting in Data Bits and