User`s guide

Chapter 6 To Make Measurements RIGOL
DS1000Z User’s Guide
5-35
RS232 Trigger (Option)
The RS232 serial protocol transimits a character as a frame of data. Each frame of
data always starts with a 1-bit start bit following which is 5-bit to 8-bit data bit and a
1-bit chack bit (this bit can be omitted) and ends with a 1/2-bit of stop bit following
which are the idle bit (the length is various). Its format is as shown in the figure
below.
Figure 5-13 RS232 Protocol Schematic Diagram
DS1000Z can trigger when frame start, error frame, check error or the specified data
on the RS232 signal is detected.
Trigger Type:
Press Type to select “RS232”. At this point, the trigger setting information as shown
in the figure below is displayed at the upper right corner of the screen.
Source Selection:
Press Source to select CH1-CH4 as the “Trigger Source”. The current trigger
source is displayed at the upper right corner of the screen.
Polarity
Press Polarity to select the polarity of date transmission. It can be set to “Normal”
or “Invert” and the default is normal.
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 bit”;