Agilent Technologies 3000 X-Series Manual de Serviço descarregar pdf (Página 87)

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.

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Agilent Technologies 3000 X-Series Manual de Serviço Página 87