Rigol MSO8000-BND - RS232 Decoding (Option); Figure 15.3 Schematic Diagram of RS232 Serial Bus; Figure 15.4 Schematic Diagram of Negative Logic

15.2 RS232 Decoding (Option)
RS232 serial bus consists of the transmitting data line (TX) and the receiving data line
(RX).
Figure 15.3 Schematic Diagram of RS232 Serial Bus
The industry standard of RS232 uses "Negative Logic", i.g. high level is logic "0" and
low level is logic "1".
Figure 15.4 Schematic Diagram of Negative Logic
In RS232, baud rate is used to represent the transmission rate (namely bits per
second) of the data.
You need to set the start bit, data bits, check bit (optional), and stop bits for each
frame of data.
Start Bit: indicates when to output data.
Data Bit: indicates the number of data bits actually contained in each frame of data.
Check Bit: used to check whether the data are properly transmitted.
Protocol Decoding
236
Copyright ©RIGOL TECHNOLOGIES CO., LTD. All rights reserved.