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RIGOL Chapter 11 Protocol Decoding
11-8 MSO5000 User Guide
1
0 0 0 0
1 1 1 1 1
Figure 11-4 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 bit for each frame of data.
Start Bit
Data Bit
Check Bit
Stop Bit
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.
Stop Bit: indicates when to stop outputting data.
In the decode setting menu, press Decode1 → Bus Type, then rotate the
multifunction knob
to select "RS232". Press down the knob to select it. You can
also press Bus Type continuously or enable the touch screen to select it.
1
． Enable or disable the bus
Press Bus Status to enable or disable the decoding function.
2
． Quickly apply RS232 trigger settings to RS232 decoding
Press Copy Trig to copy the current RS232 trigger settings and apply them to
RS232 decoding function (set the corresponding RS232 decoding parameters
automatically). For source channels, copy the source channel of the trigger to
the Tx source channel of the decoding. For analog channels, the threshold level
settings will also be copied.
3
． Set the baud rate
Three setting methods are available for baud rate:
âš« Press Baud, then set the user-defined baud rate with the displayed numeric
keypad.
âš« Press Baud, then select the preset baud rate from the available options.
The available baud rates include 50 bps, 75 bps, 110 bps, 134 bps, 150 bps,
300 bps, and etc.
âš« Press Baud, then rotate the multifunction knob to adjust the baud rate
at a small step size. The step size is different for adjusting different baud
rates.
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