356 Keysight InfiniiVision HD3-Series Oscilloscopes User's Guide
29 UART/RS232/422/485 Triggering and Protocol Decode
• Rx, Tx — Selects the analog or digital channels that are probing the receive and
transmit signals.
The RX and TX labels for the source channels are automatically set.
• Threshold — Sets the threshold voltage levels for the receive and transmit
signals.
The threshold voltage level is used in decoding and will become the trigger
level when the trigger type is set to the selected serial decode bus.
Bus Config The UART/RS232/422/485 protocol decode mode Bus Config subtab has these
controls for setting up the bus configuration:
• # of Bits — Sets the number of bits in the UART/RS232 words to match your
device under test (selectable from 5-9 bits).
• Parity — Selects Odd, Even, or None as the parity being used in your device under
test.
• Baud — Selects the baud rate of the signals in your device under test. You can
select baud rates from 1.2 kb/s to 12 Mb/s.
If the desired baud rate is not listed, select User Defined; then, enter the desired
baud rate in the User Baud field. You can set the user-defined UART baud rate
from 100 b/s to 8.0000 Mb/s.
• Polarity — Selects Idle low or Idle high to match your device under test's state
when at idle. For RS232 select Idle low.
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