Rigol DS2000E Series User Manual page 120

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SCL and its transmission data is determined by SDA, as shown in the figure below.
DS2000E triggers on start condition, restart condition, stop condition, missing
acknowledgement, specific device address or data value. Besides, it can also trigger
on the specific device address and data value at the same time.
Trigger Type:
Press Type to open the trigger type list. Rotate
"I2C". At this point, the trigger setting information is displayed at the upper right
corner of the screen. For example,
the trigger source is CH1; the trigger level is 0.00 V.
Source Selection:
Press SCL and SDA to specify the signal sources of SCL and SDA respectively. They
can be set to CH1 or CH2. For the details, please refer to the introduction in "Trigger
Source". The current trigger source is displayed at the upper right corner of the
screen.
Note: Select channel with signal input as trigger source to obtain stable trigger.
Trigger Condition:
Press When to select the desired trigger condition.
Start: trigger when SDA data transitions from high to low while SCL is high.

Restart: trigger when another start condition occurs before a stop condition.

Stop: trigger when SDA data transitions from low to high while SCL is high.

Missing ACK: trigger when the SDA data is high during any acknowledgement of

SCL clock position.
Address: trigger on the read or write bit when the preset address is met. After

5-38
Figure 5-14 I2C protocol diagram
Chapter 5 To Trigger the Oscilloscope
and press down
. The trigger type is I2C trigger;
DS2000E User's Guide
to select