Rs232 Trigger - Rigol DS4024E User Manual

RIGOL

RS232 Trigger

DS4000E 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.
Start Bit
Press MENU (in the trigger control area (TRIGGER) at the front panel)  Type, turn
the multi-function knob
Type continuously to switch to "RS232" trigger.
At this point, the trigger setting information (include the trigger type, trigger source
and trigger level, as shown in the figure below) is displayed at the upper-right side of
the screen and changes with the trigger setting.
1. Specify the source and adjust the trigger level
Press Source to select CH1 to CH4 (please refer to "Trigger Source").
1)
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.
Turn TRIGGER
2)
"Trigger Level"). The current trigger level is displayed at the upper-right
side of the screen.
2. Specify the bus polarity
Press Polarity to set the polarity of data transmission to "Normal" or "Invert".
5-28
Data Bits
Figure 5-2 RS232 Bus Frame Format
to select "RS232" and press the knob. You can also press
LEVEL to adjust the trigger level (please refer to
Chapter 5 Trigger
Stop Bits
Check Bit
DS4000E User's Guide