RIGOL  Chapter 8 Protocol Decoding 
8-8  MSO4000/DS4000 User’s Guide 
Tip 
When the current trigger type is “RS232”, performing the copy operation at any 
time can quickly apply the current RS232 trigger setting (the specified parameters) 
to RS232 decoding. Then, you can still set the RS232 decoding parameters 
according to the introductions below.  
 
3.  Set the TX and RX sources 
  Set the TX source 
Press TX; turn the multi-function knob   to select the desired source 
channel and press the knob. You can also press TX continuously to switch 
the current source channel. You can select D0 to D15 or CH1 to CH4. When 
“None” is selected, no TX source channel will be set.  
 
When an analog channel (CH1 to CH4) is selected, you can press TX and 
turn the multi-function knob 
 to adjust the threshold (the default is 0 V) 
of the TX source channel. Pressing the multi-function knob 
 can quickly 
reset the threshold of the channel to 0 V. 
 
When modifying the threshold of the TX source channel, a dotted line 
displaying the current threshold level is displayed on the screen (in the 
same color as the channel). It disappears in about 2 s after you stop 
modifying the threshold.  
 
  Set the RX source 
Use the same method to select the RX source and set the threshold (only 
when the RX source channel is set to an analog channel (CH1-CH4)). 
 
Note: The TX and RX source channels cannot be set to “None” at the same 
time.  
 
4.  Specify the baud rate 
Press Baud and turn the multi-function knob   to select the desired baud rate. 
The default is 9600 bps. You can also press Baud continuously to switch the 
current baud rate. You can select a preset baud rate or “User”.  
  The preset baud rates include 2400 bps, 4800 bps, 9600 bps, 19200 bps, 
38400 bps, 57600 bps, 115200 bps, 230400 bps, 460800 bps, 921600 bps 
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