Technical data

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Agilent InfiniiVision 7000B Series Oscilloscopes

Evaluation Guide

Verifying RS-232/UART Serial Bus

Communication

The RS-232 and UART serial buses are typically used to communicate

between a CPU/MCU and peripheral devices such as printers, storage

devices, and/or EEPROM programmers. The bus consists of separate trans-

mit and receive signals and the clock is embedded in these signals. The

RS-232/UART bus is very flexible in terms of user-definable baud rates, num-

ber of bits, bit polarity, bit order, and parity. Each of the parameters can be

defined on the Agilent InfiniiVision Series oscilloscope for triggering and

decoding this bus. You can also use the RS-232/UART trigger and decode

option on many RS-485 applications because the RS-485 specification is an

electrical specification only; not a protocol specification. To enable

RS-232/UART decode and triggering, your oscilloscope must have the

RS-232/UART serial bus decode option (Option 232) installed. You can verify

the installed options on your oscilloscope at [Utility] > Service > About

Oscilloscope.

Setup

1 Connect the demo kit’s 40-pin ribbon cable from the back of the Agilent

InfiniiVision Series oscilloscope to the 40-pin connector on the demo

board.

2 Connect channel 1 probe to the CH1 test point and ground (GND).

3 Connect channel 2 probe to the CH2 test point and ground (GND).

4 Set the rotary switch on the demo board for the RS-232 signal (Mode #7).

5 Press [Default Setup].

6 Press [Auto Scale].

7 Set the timebase to 1.0 ms/div.

8 To turn on UART/RS-232 decode,

first press [Serial]; then, select the

UART/RS232 serial decode mode.