Technical data

94 4000 X-Series Oscilloscopes Advanced Training Guide
4 Serial Bus Decoding & Triggering, Search & Navigation, and Segmented Acquisition Labs
Lab #17: Decoding, Triggering, and Searching on RS232/UART Serial Bus
Signals
In this lab you will learn how to set up the scope to decode and trigger on
transmit and receive RS232/UART serial bus traffic. In addition, you will
learn how to use the scope’s automatic RS232/UART Search & Navigation
capability, as well as Segmented Memory acquisition. This lab does not
provide a tutorial on the RS232/UART protocols and signaling. To complete
this lab, your scope must be licensed with the RS232/UART trigger and
decode option (Option COMP). You can verify the installed options on your
oscilloscope at [Help] > About Oscilloscope.
1 Connect the channel-1 probe to the Demo 1 terminal and ground.
2 Connect the channel-2 probe to the Demo 2 terminal and ground.
3 Press [Default Setup] on the scope’s front panel.
4 Press [Help]; then tap the Training Signals softkey.
5 Using the Entry knob, select the RS232/UART signal; then tap the Output
softkey to turn it on.
6 Set channel- 1 to 1.00 V/div.
7 Set channel- 1’s offset/position to -1 V.
8 Press the [2] front panel key to turn on channel- 2.
9 Set channel- 2 to 1.00 V/div.
10 Set channel- 2’s offset/position to +2.3 V.
11 Push the trigger level knob to automatically set the trigger level to
approximately 50%.
12 Set the scope’s timebase to 2.00 ms/div.