Chapter 8 Protocol Decoding RIGOL
MSO4000/DS4000 User’s Guide 8-27
3. Specify the source channel
Press Source; turn the multi-function knob to select the desired source
channel and press the knob. You can also press Source continuously to switch
the current source channel. You can select D0 to D15 or CH1 to CH4.
When an analog channel (CH1 to CH4) is selected, you can press Threshold
and turn the multi-function knob
to adjust the threshold (the default is 0 V)
of the source channel. Pressing the multi-function knob
can quickly reset
the threshold of the channel to 0 V.
When modifying the threshold of the 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.
4. Specify the signal type
Press Signal Type and turn the multi-function knob to select the signal
type that matches the CAN bus signal. You can also press Signal Type
continuously to switch the current signal type.
Rx: the receiving signal from the CAN signal line.
Tx: the transmitting signal from the CAN signal line.
CAN_H: the actual CAN_H bus signal.
CAN_L: the actual CAN_L bus signal.
Differential: the CAN differential bus signal connected to an analog channel
using a differential probe. The positive lead of the differential probe
connects the CAN_H bus signal and the negative lead connects the CAN_L
bus signal.
5. Specify the signal rate
Press Baud and turn the multi-function knob to select the signal rate that
matches the CAN bus signal. The default is 500 kb/s. You can also press Baud
continuously to switch the current signal rate. You can select a preset signal rate
or “User”.
The preset signal rates include 100 kb/s, 125 kb/s, 250 kb/s, 400 kb/s, 500
kb/s, 800 kb/s and 1 Mb/s.
When “User” is selected, press Setup and turn the multi-function knob
or the inner knob of the navigation knob to adjust the signal rate at a
relatively smaller step or turn the outer knob of the navigation knob to
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