Triggering the Oscilloscope 4
6000 Series Oscilloscope User’s Guide 201
8Press the Bus Config softkey and set the following parameters.
a#Bits: Set the number of bits in the UART/RS232 words to
match your target system (selectable from 5-9 bits).
bParity: Choose odd, even, or none, based on your target
system.
cBaud: Select the baud rate to match the signal in your
target system.
dPolarity: Select idle low or idle high to match your target
system’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 target system. For RS232 select
LSB.
9Press the up arrow key to return to the previous menu.
10 Press the Trigger Setup softkey and set up the desired trigger
condition.
Rx Start Bit: The oscilloscope triggers when a start bit
occurs on Rx.
Rx Stop Bit: Triggers when a stop bit occurs on Rx. The
trigger will occur on the first stop bit. This is done
automatically whether the target system uses 1, 1.5, or 2
stop bits. You do not need to specify the number of stop
bits used by the target system.
Rx Data: Triggers on a data byte that you specify. For use
when the target system data words are from 5 to 8 bits in
length (no 9th (alert) bit).
Rx 1:Data: For use when the target system data words are 9
bits in length including the alert bit (the 9th bit). Triggers
only when the 9th (alert) bit is 1. The specified data byte
applies to the least significant 8 bits (excludes the 9th
(alert) bit).
Rx 0:Data: For use when the target system data words are 9
bits in length including the alert bit (the 9th bit). Triggers
only when the 9th (alert) bit is 0. The specified data byte
applies to the least significant 8 bits (excludes the 9th
(alert) bit).