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Idle Time
Click or tap the input field of Idle Time, and then use the pop-up numeric keypad to
set the idle time before the edge counting in Nth edge trigger. You can also use the
corresponding multipurpose knob to set the value.
Edge Count
Click or tap the input field of Edges, then use the pop-up numeric keypad to set the
value of "N" in Nth edge trigger. You can also use the corresponding multipurpose
knob to set the value. The available range is from 1 to 65,535.
Trigger Mode
In Sweep, select Auto, Normal, or Single as the trigger mode. For details, refer to
descriptions in
Trigger Mode
.
Trigger Parameter Setting
You can refer to
Noise Rejection
to set the noise rejection under this trigger type.
Trigger Level
Click or tap the Level input field to set the trigger level with the pop-up numeric
keypad. You can also use the front-panel trigger level knob or the corresponding
multipurpose knob to set the trigger level. For details, refer to descriptions in
Trigger
Level
. The current trigger level is displayed in the trigger information label at the top
of the screen.
8.7.13 RS232 Trigger
RS232 bus is a serial communication mode used in data transmission between PCs or
between a PC and a terminal. In RS232 serial protocol, a character is transmitted as a
frame of data. The frame consists of 1 start bit, 5-8 data bits, 1 check bit, and 1-2 stop
bits. Its format is as shown in the figure below. This series oscilloscope triggers when
detecting the start frame, error frame, check error, or the specified data of the RS232
signal.
Stop BitCheck BitData BitStart Bit
1 bit 5~8 bits 1 bit 1~2 bits
Figure 8.24 Schematic Diagram of RS232 Protocol
Triggering the Oscilloscope
Copyright ©RIGOL TECHNOLOGIES CO., LTD. All rights reserved.
DHO4000 User Guide
103
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