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• Start: triggers on the start frame position.
• Error: triggers when an error frame is detected.
• Check Error: triggers when a check error is detected.
• Data: triggers on the last bit of the preset data bits. Click or tap the input field of
Data, and then use the pop-up numeric keypad to set the data of RS232 trigger.
You can also use the corresponding multipurpose knob to set the value.
Baud Rate
You can select the baud rate of data transmission (i.e. specifies a clock frequency).
Click or tap the drop-down button of
Baud Rate, then select the preset baud rate.
The available baud rates include 50 bps, 75 bps, 110 bps, 134 bps, 150 bps, 300 bps,
and etc. You can also self-define the baud rate.
Data Bits
Indicates the number of bits per frame. Click or tap the drop-down button of
Data
Bits to select the desired data bits. The available data bits include "5 Bits", "6 Bits", "7
Bits", and "8 Bits".
Stop Bit
Indicates when to stop outputting data. Select the desired stop bit in the
Stop Bit
item. The available data bits include 1 Bit, 1.5 Bits, and 2 Bits.
Parity
Used to check whether the data are properly transmitted. Select None, Even, or Odd
in the
Parity item.
• None: indicates that no check bit appears during the transmission.
• Even: indicates that the total number of "1" in the data bit and check bit is an
even number. For example, when 0x55 (01010101) is sent, "0" should be added
to the check bit.
• Odd: indicates that the total number of "1" in the data bit and check bit is an
odd number. For example, when 0x55 (01010101) is sent, "1" should be added to
the check bit.
Trigger Mode
In
Sweep, select Auto, Normal, or Single as the trigger mode. For details, refer to
descriptions in
Trigger Mode
.
Trigger Parameter Setting
You can refer to
Noise Rejection
to set the noise rejection under this trigger type.
Triggering the Oscilloscope
Copyright ©RIGOL TECHNOLOGIES CO., LTD. All rights reserved. DHO900 User Guide
97
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