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RIGOL Chapter 5 To Trigger the Oscilloscope
5-38 MSO2000A/DS2000A User’s Guide
RS232 Trigger
RS232 bus is a serial communication mode used in the data transmission between
PCs or between PC and terminal. In RS232 serial protocol, a character is transmitted
as a frame of data which consists of 1 bit start bit, 5~ 8 bits data bits, 1 bit check bit
and 1~ 2 bits stop bit(s). Its format is as shown in the f igure below.
Figure 5-13 RS232 Trigger
MSO2000A/DS2000A 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 and press down 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. 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, CH2 or any channel of
D0-D15. 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.
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