Rigol DS1104Z-S-PLUS DS1000Z user manual

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RIGOL Chapter 5 To Trigger the Oscilloscope

5-32 DS1000Z User Guide

RS232 Trigger

RS232 bus is a serial communication mode used in the data transmission between

PCs or between PC and terminal. In RS232 serial protocol, a character is transmitted

as a frame of data which consists of 1 bit start bit, 5~8 bits data bits, 1 bit check bit

and 1~2 bits stop bit(s). Its format is as shown in the figure below. DS1000Z

oscilloscope triggers when the start frame, error frame, check error or the specified

data of the RS232 signal is detected.

Figure 5-13 Schematic Diagram of RS232 Protocol

Trigger Type:

Press Type to open the trigger type list. Rotate to select "RS232" and press

down

. At this point, the trigger setting information is displayed at the upper right

corner of the screen.

For example,

. The trigger type is RS232 trigger; the current

trigger source is CH1; the trigger level is 0.00 V.

Source Selection:

Press Source to open the signal source list and select CH1-CH4 or D0-D15. For the

details, please refer to the introduction in "

Trigger Source". The current trigger

source is displayed at the upper right corner of the screen.

Note: Select channel with signal input as trigger source to obtain stable trigger.

Polarity

Press Polarity to select the polarity of data transmission. It can be set to " "

or "

" and the default is .

Trigger Condition:

Press When to select the desired trigger condition.

 Start: trigger on the start frame position.

 Error: trigger when error frame is detected. After this trigger condition is

selected:

--press Stop Bit to select "1 bit" or "2 bits";

--press EvenOdd to select "None", "Odd" or "Even".

The oscilloscope will determine error frame according to the preset parameters.

 ChkError: trigger when check error is detected. When this trigger condition is

selected, press EvenOdd to select "Odd" or "Even". The oscilloscope will

determine check error according to the preset parameters.

 Data: trigger on the last bit of the preset data bits. When this trigger condition is

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Rigol DS1104Z-S-PLUS DS1104Z-S+ oscilloscope