Instructions

Digital Storage Oscilloscope 36
 Data Bits - Data Length, Set the number of bits in the UART2 words to match your
device under test (selectable from 5-8 bits).
5. Press the When 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 measured signal. The trigger occurs on
the first stop bit regardless of using 1, 1.5 or 2 stop bit.
 Spec 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 When softkey, and choose an equality qualifier. You can choose
equal to(=), not equal to(!=), less than(<), or greater than(>) a specific data value.
b. Press the Data softkey, and turn V0 to set the data value for your trigger
comparison. The range of the data value is 0x00 to 0xff.
This works in conjunction with the When softkey.
Parity error: The oscilloscope triggers when the parity check is error when there is
parity check.
Com error: The oscilloscope triggers when the received data is error.
Note: Use V0 to set the data. When the arrow shows vertical on the top left of Data
menu, turn V0 to set the value of the current data bit; then press V0, the arrow shows
horizontal, and turn V0 to select the data bits that you want to set.
: Horizontal arrow, turn the Universal Knob to select a digit.
: arrow, turn the Universal Knob to set the value of the selected digit.
For example1, source: CH1; baud: 19200; Idle: High; Parity: No; Data Bit: 8; when:
“Start”. The trigger result is shown below: