Rigol DS2000E Series, Руководство пользователя, Страница: 118 / 283

RIGOL Chapter 5 To Trigger the Oscilloscope
5-36 DS2000E User’s Guide
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.
Figure 5-13 RS232 protocol diagram
Trigger Type:
Press Type to open the trigger type list. Rotate
and press down to select
"RS232". At this point, the trigger setting information is displayed at the upper right
corner of the screen. For example, . The trigger type is RS232
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".