Rs232 Decoding (Option) - Rigol DS6000 Series User Manual

7 Protocol Decoding RIGOL

RS232 Decoding (Option)

RS232 serial bus consists of the transmitting data line (TX) and the receiving data
line (RX).
Rx Tx
DeviceA DeviceB
Tx
Rx
The industry standard of RS232 uses "Negative Logic", namely high level is logic "0"
and low level is logic "1".
0 0 0 0
1 1 1 1 1 1
By default, RS232 uses LSB (Least Significant Bit) transmission sequence, namely
the lowest bit of the data is transmitted first. While for MSB (Most Significant Bit),
the highest bit of the data is transmitted first.
t t
Endian (LSB) Endian (MSB)
In RS232, baud rate is used to represent the transmitting rate (namely bits per
second) of the data.
DS6000 User's Guide 7-5