RIGOL Chapter 5 Trigger
5-34 MSO4000/DS4000 User’s Guide
RS232 Trigger
MSO4000/DS4000 can trigger on the start of a frame, error frame, check error or the
specified data bit of the RS232 signal.
RS232 bus is a serial communication mode used for the data transmission between
PCs or between PC and terminal end. The RS232 serial protocol transmits a character
by treating it as a frame of data consisting of 1 bit start bit, 5 to 8 bits data bits, 1 bit
check bit and 1 to 2 bits stop bits. The format is as shown in the figure below.
Figure 5-2 RS232 Bus Frame Format
Press MENU (in the trigger control area (TRIGGER) at the front panel) Type, turn
the multi-function knob to select “RS232” and press the knob. You can also press
Type continuously to switch to “RS232” trigger.
At this point, the trigger setting information (include the trigger type, trigger source
and trigger level/threshold level, as shown in the figure below) is displayed at the
upper-right side of the screen and changes with the trigger setting.
Set the RS232 trigger:
1. Specify the source and adjust the trigger level/threshold level
1) Press Source to select CH1 to CH4 or D0 to D15 (please refer to “Trigger
Source”). The source currently selected is displayed at the upper-right side
of the screen.
Note: Channels that are turned off can also be selected as the trigger
source.
2) Turn TRIGGER
LEVEL to adjust the trigger level (when the source is
CH1 to CH4) or threshold level (when the source is D0 to D15) (please refer
Start Bit
Data Bits
Check Bit
Stop Bits
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