Triggering 4
InfiniiVision Oscilloscopes User’s Guide 167
6 Press the Signals softkey to display the UART/RS232 Signals Menu.
7 Connect an oscilloscope channel to the Rx signal in the device under test, then press
the Rx softkey and rotate the Entry knob to select the channel.
As you press the Rx softkey (or rotate the Entry knob), the channel you select is
shown in the upper-right corner of the display next to “URT”.
8 Make sure the trigger or threshold levels are set to the middle of the signal:
• For analog channels, turn the Trigger Level knob.
• For digital channels, press the [D15-D0] key and the Thresholds softkey to access
the threshold level setting softkeys.
The value of the trigger level or digital threshold is displayed in the upper-right corner
of the display.
9 Repeat these steps for the Tx signal.
10 Press the [More] key, then the Settings softkey to return to the UART/RS232 Trigger
Menu.
11 Press the Bus Config softkey and set the following parameters.
a#Bits: Set the number of bits in the UART/RS232 words to match your device
under test (selectable from 5-9 bits).
bParity: Choose odd, even, or none, based on your device under test.
cBaud: Press the Baud Rate softkey, then press the Baud softkey and select a baud
rate to match the signal in your device under test. If the desired baud rate is not
listed, select User Defined on the Baud softkey, then select the desired baud rate
using the User Baud softkey. You can set the UART baud rate from 1.2 kb/s to
3.0000 Mb/s in increments of 100 b/s.
dPolarity: Select idle low or idle high to match your device under test’s state when
at idle. For RS232 select idle low.
e Bit Order: Select whether the most significant bit (MSB) or the least significant bit
(LSB) is presented after the start bit in the signal from your device under test. For
RS232 select LSB.
Rx
channel
Tx
channel
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