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SIGLENT
SDS2000X User Manual 93
UART/RS232 Triggering
To trigger on a UART (Universal Asynchronous Receiver/Transmitter) signal connect the
oscilloscope to the RX and TX lines and set up a trigger condition. RS232 (Recommended
Standard 232) is one example of a UART protocol.
1. Press Setup button on the front panel to enter the TRIGGER function menu.
2. Press the Type softkey; then, turn the Universal Knob to select the ―serial‖ and press
the Protocol softkey to select ―UART‖.
3. Press the Trigger Setting softkey to enter the UART TRIG SET menu.
Figure 50: UART TRIG SET Menu
4. Press the Source Type softkey to select TXDATA or RX DATA.
5. Press the Trigger softkey and set up the desired trigger condition:
Start — The oscilloscope triggers when a start bit occurs.
Stop — Triggers when a stop bit occurs on RX. vice under test uses 1, 1.5, •
Data — Triggers on a data byte that you specify. For use when the device under
test data words are from 5 to 8 bits in length
a. Press the Compare Type softkey, and choose an equality qualifier. You can
choose equal to, less than, or greater than a specific data value.
b. Use the Value softkey to choose the data value for your trigger comparison.
This works in conjunction with the Compare Type softkey. The range of the
Value is 0x00 to 0xff.
Figure 51:UART Trigger
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