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•
DATA SETTING: Rotate the knob under the bit setting interface to set the data. The
upper and lower bounds of the data
are directly related to the data bit width.
■ 5-bit corresponds to 0——31
■ 6-bit corresponds to 0——63
■ 7-bit corresponds to 0——127
■ 8-bit corresponds to 0——255
•
STOP BITS SETTING: Select the STOP BITS option to open the stop bits selection
list.
•
Press the STOP BITS option key again to switch between 1 or 2 bits.
•
The Multi-purpose control can also be used for this function.
•
PARITY BIT SETTING: Select the PARITY BITS option under the bit setting
interface, and the parity selection list will pop up.
•
Press the PARITY BIT option key again to switch between zero, odd, and even.
Zero means no parity. Even and odd mean even parity and odd parity respectively.
•
The Multi-purpose control can also set the parity bit.
•
Press the RETURN option button key to return to the previous menu.
•
Press NEXT PAGE key to enter the following settings:
•
CONDITION: Trigger Condition Settings
•
There are four kinds of trigger methods: Start of frame, error frame, parity error, and
data.
•
Press the CONDITION option button and the trigger condition list will pop up.
•
Press the CONDITION button again to switch between the four modes.
•
The Multi-purpose control can also set the trigger condition.
•
START OF FRAME: The waveform trigger is at the start bit of the RS232 protocol
(referred to the drawing). Stable waveforms can be observed by choosing the start
of frame when single string signals or multiple same string signals are sent. If the
data being sent is changing, the waveform will also change correspondingly.
•
PARITY ERROR: Set the RS232 parity bit to 0 or 1 according to the parity
principles, the principles are as follows:
•
ODD PARITY: If the 1st bit is odd for data bit and parity bit, the transmission will be
correct.
•
EVEN PARITY: If the 1st bit is even for data bit and parity bit, the transmission will
be correct.
This function can quickly check the transmission process with parity error during
RS232 communication, for ease of analysing and locating faults.
•
ERROR FRAME: The error frame can be classified to two kinds. One is parity
error (odd or even error), the other is transmission error. The transmission error
conditions are as follows:
1. The signal is not set to 1 where there should be stop bits, then the frame
data is wrong.
2. When signals suddenly change and become unstable, this function can
quickly test for transmission errors.
•
DATA: The waveform triggers when the data of BIT SETTING menu is equal to the
data the oscilloscope is collecting. Note that the data setting range is related to the
data bit width. This function can quickly find the transmitting signals of particular
data set.
15
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