Agilent Technologies InfiniiVision 3000 X- Series, Advanced Training Manual, Page: 87 / 128

Serial Bus Decoding & Triggering, Search & Navigation, and Segmented Acquisition Labs
4
3000 X-Series Oscilloscopes Advanced Training Guide 87
20
Press the [Label] front panel key (between channel- 1 and channel- 2
controls) to turn on the scope’s default labels.
You should now see RS232/UART decoding of these signals on your scope’s
display similar to
Figure 61 , but we still haven’t established stable
triggering. The scope is still triggering on any rising edge of channel- 1
(default trigger condition). Let’s now set up the scope to trigger when the
transmit data signal (TX) is equal to 4D
HEX
.
21
Press the [Trigger] front panel key; then select Serial 1 (UART/RS232) using
the Entry knob.
22 Press the
Trigger Setup
softkey; then select
Tx Data
using the Entry knob.
23 Press the
Data
softkey; then select
0x4D
using the Entry knob.
24 Set the scope’s timebase to
1.000 ms/div
.
Figure 61 Decoding the RS232/UART serial bus.