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(3) Polarity
Press the Polarity key to select the trigger polarity: positive and negative polarity.
a. Negative polarity: opposite logic level polarity, i.e. high level is 0 and low level is 1.
b. Positive polarity: normal logic level polarity, i.e. high level is 1, low level is 0.
(4) Bit Width
Specify the data bit width of RS232 protocol signal to be decoded, 5 bits, 6 its, 7 bits, 8 bits can be
selected.
(5) Bit Order
Specify whether the data bits of the RS232 protocol signal to be decoded are high bit first (MSB) or
low bit first (LSB), and either MSB or LSB can be selected.
a. MSB: The high bit of data is transmitted first.
b. LSB: Data low bit is transmitted first.
(6) Stop Bit
The stop bit is the bit that sets the stop after each data frame. It can be set to 1 bit or 2 bits.
(7) Parity
Set the parity mode of data transmission. It can select no parity, even parity or odd parity.
(8) Trigger Condition
The trigger condition is to set the trigger condition, it can choose start frame, error frame, parity error
and data.
a. Start frame: Waveform triggering at the start bit of RS232 protocol. When send a single string or
send the same string several times, this trigger can be used to see a stable signal waveform, and
if the sent data changes, the corresponding waveform will also be change.
b. Error frame: When receiving 0 in the stop state or data error occurs in the middle of data bits.
c. Parity error: RS232 protocol sets the parity bit to 0 or 1 according to the parity rule when there is
a parity bit setting.
The parity rule is as follows.
Odd parity: If in data bits and parity bits, number of bit 1 is odd, then the transmission is correct.
Even Check: If in data bits and parity bits, number of bit 1 is even, then the transmission is correct.
Using this option, user can check the RS232 communication process and quickly find the
transmission process of parity error, so that you can easily locate the fault analysis.
d. Data: The trigger is generated when the data acquired by the oscilloscope is the same as the 2-
bit hexadecimal number set by the user. Using this option, user can quickly find the transmission
signal of the specific data you are interested in.
(9) Data
It will be valid when the trigger condition is "Data", settable range: 00 ~ FF (hexadecimal number).
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