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8.7.13 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. This series oscilloscope triggers when
the start frame, error frame, check error, or the specified data of the RS232 signal is
detected.
Stop BitCheck BitData BitStart Bit
1 bit 5~8 bits 1 bit 1~2 bits
Figure 8.13 Schematic Diagram of RS232 Protocol
Trigger Type:
Press
Type, and then rotate the multifunction knob to select "RS232". Press down
the knob to select the trigger type. Then, the current trigger setting information is
displayed at the upper-right corner of the screen, as shown in the figure below. You
can also press Type continuously or enable the touch screen to select it.
Source Selection:
Press Source to open the signal source list and select CH1-CH4 or D0-D15. 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:
Press
When, then rotate the multifunction knob to select the the desired trigger
condition. Press down the knob to select it. You can also press When continuously or
enable the touch screen to select it.
• Start: triggers on the start frame position.
• Error: triggers when an error frame is detected.
To Trigger the Oscilloscope
110
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