UART/RS232 Triggering and Serial Decode 15
InfiniiVision 7000B Series Oscilloscopes User’s Guide 335
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.
eBit 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.
UART/RS232 Triggering
To set up the oscilloscope to capture UART/RS- 232 signals, see “Setup for
UART/RS232 Signals” on page 334.
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 [Trigger]; then, select the UART/RS232 trigger type.
2 Press the Base softkey to select Hex or ASCII as the base displayed on
the Data softkey in the UART/RS232 Trigger Setup Menu.
In the serial decode display, the most significant bit is always displayed on the left
regardless of how Bit Order is set.
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