Rigol DS2102A 2-channel oscilloscope, Digital Storage oscilloscope, DS2102A User Manual
Product codes
DS2102A
RIGOL
DS2000A User’s Guide
7-5
RS232 Decoding (Option)
RS232 serial bus consists of the transmitting data line (TX) and the receiving data
line (RX).
DeviceA
DeviceB
Tx
Rx
Rx
Tx
The industry standard of RS232 uses “Negative Logic”, namely high level is logic “0”
and low level is logic “1”.
1
0
0
0
0
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.
Bit
0
Bit
5
Bit
2
Bit
3
Bit
6
Bit
1
Bit
7
Bit
4
t
Bit
7
Bit
2
Bit
5
Bit
4
Bit
1
Bit
6
Bit
0
Bit
3
t
Endian (LSB) Endian (MSB)
In RS232, baud rate is used to represent the transmitting rate (namely bits per
second) of the data. The commonly used baud rates include 2400 bps, 4800 bps,
9600 bps, 19200 bps, 38400 bps, 56000 bps and 115200 bps.
In RS232, you need to set the start bit, data bits, check bit (optional) and stop bit of
each frame of data.
In RS232, baud rate is used to represent the transmitting rate (namely bits per
second) of the data. The commonly used baud rates include 2400 bps, 4800 bps,
9600 bps, 19200 bps, 38400 bps, 56000 bps and 115200 bps.
In RS232, you need to set the start bit, data bits, check bit (optional) and stop bit of
each frame of data.