Rigol DS2000E Series User Manual page 118

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and 1~2 bits stop bit(s). Its format is as shown in the figure below.
DS2000E oscilloscope triggers when the start frame, error frame, check error, or the
specified data of the RS232 signal is detected.
Trigger Type:
Press Type to open the trigger type list. Rotate
"RS232". At this point, the trigger setting information is displayed at the upper right
corner of the screen. For example,
trigger; the trigger source is CH1; the trigger level is -1.80 V.
Source Selection:
Press Source to open the signal source list and select CH1 or CH2. For the details,
please refer to the introduction in "Trigger Source". The current trigger source is
displayed at the upper right corner of the screen.
Note: Select channel with signal input as trigger source to obtain stable trigger.
Polarity:
Press Polarity to select the polarity of date transmission. It can be set to "Normal"
or "Invert" and the default is "Normal".
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-Odd to select "None", "Odd" or "Even".
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 Stop Bit to select "1 bit" or "2 bit".
5-36
Figure 5-13 RS232 protocol diagram
Chapter 5 To Trigger the Oscilloscope
and press down
. The trigger type is RS232
DS2000E User's Guide
to select