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RIGOL Chapter 5 To Trigger the Oscilloscope
5-32 DS8000-R User Guide
RS232 Trigger (Option)
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. DS8000-R series oscilloscope
triggers when the start frame, error frame, check error, or the specified data of the
RS232 signal is detected.
Figure 5-13 Schematic Diagram of RS232 Protocol
Trigger Type:
Click Type to select "RS232". Then, the current trigger setting information is
displayed at the upper-right corner of the screen, as shown in the figure below.
Source:
Click Source to open the signal source list and select CH1-CH4. For details, refer to
descriptions in "Trigger Source". The current trigger source is displayed at the
upper-right corner of the screen.
Note: Only when we select the channel (that has been input with signals) as the
trigger source, can we obtain a stable trigger.
Trigger Condition:
Click When to select the desired trigger condition.
âš« Start: triggers on the start frame position.
âš« Error: triggers when an error frame is detected.
âš« Check Error: triggers when a check error is detected.
âš« Data: triggers on the last bit of the preset data bits. Click Data, then use the
numeric keypad or scroll with the mouse to set the data of RS232 trigger.
Data Bits:
Indicate the number of bits per frame. Click More → Data Bits to select the desired
data bits. The available data bits include "5 Bits", "6 Bits", "7 Bits", and "8 Bits".
Stop Bit:
Indicate when to stop outputting. Click More → Stop Bit to select the desired stop
bit. The available stop bit include "1 Bit", "1.5 Bits", and "2 Bits".
Start Bit
Data Bits
Check Bit
Stop Bit
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