Rs232 Trigger (Option) - Rigol DS8000-R Series User Manual

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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.
Start Bit
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.
Start: triggers on the start frame position.
⚫
Error: triggers when an error frame is detected.
⚫
Check Error: triggers when a check error is detected.
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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".
5-32
Data Bits
Chapter 5 To Trigger the Oscilloscope
Check Bit
DS8000-R User Guide
Stop Bit